/* HTTP support. Copyright (C) 1996-2005 Free Software Foundation, Inc. This file is part of GNU Wget. GNU Wget is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. GNU Wget is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Wget; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. In addition, as a special exception, the Free Software Foundation gives permission to link the code of its release of Wget with the OpenSSL project's "OpenSSL" library (or with modified versions of it that use the same license as the "OpenSSL" library), and distribute the linked executables. You must obey the GNU General Public License in all respects for all of the code used other than "OpenSSL". If you modify this file, you may extend this exception to your version of the file, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version. */ #include #include #include #include #ifdef HAVE_UNISTD_H # include #endif #include #include #include #include #include "wget.h" #include "http.h" #include "utils.h" #include "url.h" #include "host.h" #include "retr.h" #include "connect.h" #include "netrc.h" #ifdef HAVE_SSL # include "ssl.h" #endif #ifdef ENABLE_NTLM # include "http-ntlm.h" #endif #include "cookies.h" #ifdef ENABLE_DIGEST # include "gen-md5.h" #endif #include "convert.h" extern char *version_string; #ifndef MIN # define MIN(x, y) ((x) > (y) ? (y) : (x)) #endif static bool cookies_loaded_p; static struct cookie_jar *wget_cookie_jar; #define TEXTHTML_S "text/html" #define TEXTXHTML_S "application/xhtml+xml" /* Some status code validation macros: */ #define H_20X(x) (((x) >= 200) && ((x) < 300)) #define H_PARTIAL(x) ((x) == HTTP_STATUS_PARTIAL_CONTENTS) #define H_REDIRECTED(x) ((x) == HTTP_STATUS_MOVED_PERMANENTLY \ || (x) == HTTP_STATUS_MOVED_TEMPORARILY \ || (x) == HTTP_STATUS_SEE_OTHER \ || (x) == HTTP_STATUS_TEMPORARY_REDIRECT) /* HTTP/1.0 status codes from RFC1945, provided for reference. */ /* Successful 2xx. */ #define HTTP_STATUS_OK 200 #define HTTP_STATUS_CREATED 201 #define HTTP_STATUS_ACCEPTED 202 #define HTTP_STATUS_NO_CONTENT 204 #define HTTP_STATUS_PARTIAL_CONTENTS 206 /* Redirection 3xx. */ #define HTTP_STATUS_MULTIPLE_CHOICES 300 #define HTTP_STATUS_MOVED_PERMANENTLY 301 #define HTTP_STATUS_MOVED_TEMPORARILY 302 #define HTTP_STATUS_SEE_OTHER 303 /* from HTTP/1.1 */ #define HTTP_STATUS_NOT_MODIFIED 304 #define HTTP_STATUS_TEMPORARY_REDIRECT 307 /* from HTTP/1.1 */ /* Client error 4xx. */ #define HTTP_STATUS_BAD_REQUEST 400 #define HTTP_STATUS_UNAUTHORIZED 401 #define HTTP_STATUS_FORBIDDEN 403 #define HTTP_STATUS_NOT_FOUND 404 #define HTTP_STATUS_RANGE_NOT_SATISFIABLE 416 /* Server errors 5xx. */ #define HTTP_STATUS_INTERNAL 500 #define HTTP_STATUS_NOT_IMPLEMENTED 501 #define HTTP_STATUS_BAD_GATEWAY 502 #define HTTP_STATUS_UNAVAILABLE 503 enum rp { rel_none, rel_name, rel_value, rel_both }; struct request { const char *method; char *arg; struct request_header { char *name, *value; enum rp release_policy; } *headers; int hcount, hcapacity; }; /* Create a new, empty request. At least request_set_method must be called before the request can be used. */ static struct request * request_new (void) { struct request *req = xnew0 (struct request); req->hcapacity = 8; req->headers = xnew_array (struct request_header, req->hcapacity); return req; } /* Set the request's method and its arguments. METH should be a literal string (or it should outlive the request) because it will not be freed. ARG will be freed by request_free. */ static void request_set_method (struct request *req, const char *meth, char *arg) { req->method = meth; req->arg = arg; } /* Return the method string passed with the last call to request_set_method. */ static const char * request_method (const struct request *req) { return req->method; } /* Free one header according to the release policy specified with request_set_header. */ static void release_header (struct request_header *hdr) { switch (hdr->release_policy) { case rel_none: break; case rel_name: xfree (hdr->name); break; case rel_value: xfree (hdr->value); break; case rel_both: xfree (hdr->name); xfree (hdr->value); break; } } /* Set the request named NAME to VALUE. Specifically, this means that a "NAME: VALUE\r\n" header line will be used in the request. If a header with the same name previously existed in the request, its value will be replaced by this one. A NULL value means do nothing. RELEASE_POLICY determines whether NAME and VALUE should be released (freed) with request_free. Allowed values are: - rel_none - don't free NAME or VALUE - rel_name - free NAME when done - rel_value - free VALUE when done - rel_both - free both NAME and VALUE when done Setting release policy is useful when arguments come from different sources. For example: // Don't free literal strings! request_set_header (req, "Pragma", "no-cache", rel_none); // Don't free a global variable, we'll need it later. request_set_header (req, "Referer", opt.referer, rel_none); // Value freshly allocated, free it when done. request_set_header (req, "Range", aprintf ("bytes=%s-", number_to_static_string (hs->restval)), rel_value); */ static void request_set_header (struct request *req, char *name, char *value, enum rp release_policy) { struct request_header *hdr; int i; if (!value) { /* A NULL value is a no-op; if freeing the name is requested, free it now to avoid leaks. */ if (release_policy == rel_name || release_policy == rel_both) xfree (name); return; } for (i = 0; i < req->hcount; i++) { hdr = &req->headers[i]; if (0 == strcasecmp (name, hdr->name)) { /* Replace existing header. */ release_header (hdr); hdr->name = name; hdr->value = value; hdr->release_policy = release_policy; return; } } /* Install new header. */ if (req->hcount >= req->hcapacity) { req->hcapacity <<= 1; req->headers = xrealloc (req->headers, req->hcapacity * sizeof (*hdr)); } hdr = &req->headers[req->hcount++]; hdr->name = name; hdr->value = value; hdr->release_policy = release_policy; } /* Like request_set_header, but sets the whole header line, as provided by the user using the `--header' option. For example, request_set_user_header (req, "Foo: bar") works just like request_set_header (req, "Foo", "bar"). */ static void request_set_user_header (struct request *req, const char *header) { char *name; const char *p = strchr (header, ':'); if (!p) return; BOUNDED_TO_ALLOCA (header, p, name); ++p; while (ISSPACE (*p)) ++p; request_set_header (req, xstrdup (name), (char *) p, rel_name); } /* Remove the header with specified name from REQ. Returns true if the header was actually removed, false otherwise. */ static bool request_remove_header (struct request *req, char *name) { int i; for (i = 0; i < req->hcount; i++) { struct request_header *hdr = &req->headers[i]; if (0 == strcasecmp (name, hdr->name)) { release_header (hdr); /* Move the remaining headers by one. */ if (i < req->hcount - 1) memmove (hdr, hdr + 1, (req->hcount - i - 1) * sizeof (*hdr)); --req->hcount; return true; } } return false; } #define APPEND(p, str) do { \ int A_len = strlen (str); \ memcpy (p, str, A_len); \ p += A_len; \ } while (0) /* Construct the request and write it to FD using fd_write. */ static int request_send (const struct request *req, int fd) { char *request_string, *p; int i, size, write_error; /* Count the request size. */ size = 0; /* METHOD " " ARG " " "HTTP/1.0" "\r\n" */ size += strlen (req->method) + 1 + strlen (req->arg) + 1 + 8 + 2; for (i = 0; i < req->hcount; i++) { struct request_header *hdr = &req->headers[i]; /* NAME ": " VALUE "\r\n" */ size += strlen (hdr->name) + 2 + strlen (hdr->value) + 2; } /* "\r\n\0" */ size += 3; p = request_string = alloca_array (char, size); /* Generate the request. */ APPEND (p, req->method); *p++ = ' '; APPEND (p, req->arg); *p++ = ' '; memcpy (p, "HTTP/1.0\r\n", 10); p += 10; for (i = 0; i < req->hcount; i++) { struct request_header *hdr = &req->headers[i]; APPEND (p, hdr->name); *p++ = ':', *p++ = ' '; APPEND (p, hdr->value); *p++ = '\r', *p++ = '\n'; } *p++ = '\r', *p++ = '\n', *p++ = '\0'; assert (p - request_string == size); #undef APPEND DEBUGP (("\n---request begin---\n%s---request end---\n", request_string)); /* Send the request to the server. */ write_error = fd_write (fd, request_string, size - 1, -1); if (write_error < 0) logprintf (LOG_VERBOSE, _("Failed writing HTTP request: %s.\n"), strerror (errno)); return write_error; } /* Release the resources used by REQ. */ static void request_free (struct request *req) { int i; xfree_null (req->arg); for (i = 0; i < req->hcount; i++) release_header (&req->headers[i]); xfree_null (req->headers); xfree (req); } /* Send the contents of FILE_NAME to SOCK. Make sure that exactly PROMISED_SIZE bytes are sent over the wire -- if the file is longer, read only that much; if the file is shorter, report an error. */ static int post_file (int sock, const char *file_name, wgint promised_size) { static char chunk[8192]; wgint written = 0; int write_error; FILE *fp; DEBUGP (("[writing POST file %s ... ", file_name)); fp = fopen (file_name, "rb"); if (!fp) return -1; while (!feof (fp) && written < promised_size) { int towrite; int length = fread (chunk, 1, sizeof (chunk), fp); if (length == 0) break; towrite = MIN (promised_size - written, length); write_error = fd_write (sock, chunk, towrite, -1); if (write_error < 0) { fclose (fp); return -1; } written += towrite; } fclose (fp); /* If we've written less than was promised, report a (probably nonsensical) error rather than break the promise. */ if (written < promised_size) { errno = EINVAL; return -1; } assert (written == promised_size); DEBUGP (("done]\n")); return 0; } /* Determine whether [START, PEEKED + PEEKLEN) contains an empty line. If so, return the pointer to the position after the line, otherwise return NULL. This is used as callback to fd_read_hunk. The data between START and PEEKED has been read and cannot be "unread"; the data after PEEKED has only been peeked. */ static const char * response_head_terminator (const char *start, const char *peeked, int peeklen) { const char *p, *end; /* If at first peek, verify whether HUNK starts with "HTTP". If not, this is a HTTP/0.9 request and we must bail out without reading anything. */ if (start == peeked && 0 != memcmp (start, "HTTP", MIN (peeklen, 4))) return start; /* Look for "\n[\r]\n", and return the following position if found. Start two chars before the current to cover the possibility that part of the terminator (e.g. "\n\r") arrived in the previous batch. */ p = peeked - start < 2 ? start : peeked - 2; end = peeked + peeklen; /* Check for \n\r\n or \n\n anywhere in [p, end-2). */ for (; p < end - 2; p++) if (*p == '\n') { if (p[1] == '\r' && p[2] == '\n') return p + 3; else if (p[1] == '\n') return p + 2; } /* p==end-2: check for \n\n directly preceding END. */ if (p[0] == '\n' && p[1] == '\n') return p + 2; return NULL; } /* The maximum size of a single HTTP response we care to read. Rather than being a limit of the reader implementation, this limit prevents Wget from slurping all available memory upon encountering malicious or buggy server output, thus protecting the user. Define it to 0 to remove the limit. */ #define HTTP_RESPONSE_MAX_SIZE 65536 /* Read the HTTP request head from FD and return it. The error conditions are the same as with fd_read_hunk. To support HTTP/0.9 responses, this function tries to make sure that the data begins with "HTTP". If this is not the case, no data is read and an empty request is returned, so that the remaining data can be treated as body. */ static char * read_http_response_head (int fd) { return fd_read_hunk (fd, response_head_terminator, 512, HTTP_RESPONSE_MAX_SIZE); } struct response { /* The response data. */ const char *data; /* The array of pointers that indicate where each header starts. For example, given this HTTP response: HTTP/1.0 200 Ok Description: some text Etag: x The headers are located like this: "HTTP/1.0 200 Ok\r\nDescription: some\r\n text\r\nEtag: x\r\n\r\n" ^ ^ ^ ^ headers[0] headers[1] headers[2] headers[3] I.e. headers[0] points to the beginning of the request, headers[1] points to the end of the first header and the beginning of the second one, etc. */ const char **headers; }; /* Create a new response object from the text of the HTTP response, available in HEAD. That text is automatically split into constituent header lines for fast retrieval using resp_header_*. */ static struct response * resp_new (const char *head) { const char *hdr; int count, size; struct response *resp = xnew0 (struct response); resp->data = head; if (*head == '\0') { /* Empty head means that we're dealing with a headerless (HTTP/0.9) response. In that case, don't set HEADERS at all. */ return resp; } /* Split HEAD into header lines, so that resp_header_* functions don't need to do this over and over again. */ size = count = 0; hdr = head; while (1) { DO_REALLOC (resp->headers, size, count + 1, const char *); resp->headers[count++] = hdr; /* Break upon encountering an empty line. */ if (!hdr[0] || (hdr[0] == '\r' && hdr[1] == '\n') || hdr[0] == '\n') break; /* Find the end of HDR, including continuations. */ do { const char *end = strchr (hdr, '\n'); if (end) hdr = end + 1; else hdr += strlen (hdr); } while (*hdr == ' ' || *hdr == '\t'); } DO_REALLOC (resp->headers, size, count + 1, const char *); resp->headers[count] = NULL; return resp; } /* Locate the header named NAME in the request data, starting with position START. This allows the code to loop through the request data, filtering for all requests of a given name. Returns the found position, or -1 for failure. The code that uses this function typically looks like this: for (pos = 0; (pos = resp_header_locate (...)) != -1; pos++) ... do something with header ... If you only care about one header, use resp_header_get instead of this function. */ static int resp_header_locate (const struct response *resp, const char *name, int start, const char **begptr, const char **endptr) { int i; const char **headers = resp->headers; int name_len; if (!headers || !headers[1]) return -1; name_len = strlen (name); if (start > 0) i = start; else i = 1; for (; headers[i + 1]; i++) { const char *b = headers[i]; const char *e = headers[i + 1]; if (e - b > name_len && b[name_len] == ':' && 0 == strncasecmp (b, name, name_len)) { b += name_len + 1; while (b < e && ISSPACE (*b)) ++b; while (b < e && ISSPACE (e[-1])) --e; *begptr = b; *endptr = e; return i; } } return -1; } /* Find and retrieve the header named NAME in the request data. If found, set *BEGPTR to its starting, and *ENDPTR to its ending position, and return true. Otherwise return false. This function is used as a building block for resp_header_copy and resp_header_strdup. */ static bool resp_header_get (const struct response *resp, const char *name, const char **begptr, const char **endptr) { int pos = resp_header_locate (resp, name, 0, begptr, endptr); return pos != -1; } /* Copy the response header named NAME to buffer BUF, no longer than BUFSIZE (BUFSIZE includes the terminating 0). If the header exists, true is returned, false otherwise. If there should be no limit on the size of the header, use resp_header_strdup instead. If BUFSIZE is 0, no data is copied, but the boolean indication of whether the header is present is still returned. */ static bool resp_header_copy (const struct response *resp, const char *name, char *buf, int bufsize) { const char *b, *e; if (!resp_header_get (resp, name, &b, &e)) return false; if (bufsize) { int len = MIN (e - b, bufsize - 1); memcpy (buf, b, len); buf[len] = '\0'; } return true; } /* Return the value of header named NAME in RESP, allocated with malloc. If such a header does not exist in RESP, return NULL. */ static char * resp_header_strdup (const struct response *resp, const char *name) { const char *b, *e; if (!resp_header_get (resp, name, &b, &e)) return NULL; return strdupdelim (b, e); } /* Parse the HTTP status line, which is of format: HTTP-Version SP Status-Code SP Reason-Phrase The function returns the status-code, or -1 if the status line appears malformed. The pointer to "reason-phrase" message is returned in *MESSAGE. */ static int resp_status (const struct response *resp, char **message) { int status; const char *p, *end; if (!resp->headers) { /* For a HTTP/0.9 response, assume status 200. */ if (message) *message = xstrdup (_("No headers, assuming HTTP/0.9")); return 200; } p = resp->headers[0]; end = resp->headers[1]; if (!end) return -1; /* "HTTP" */ if (end - p < 4 || 0 != strncmp (p, "HTTP", 4)) return -1; p += 4; /* Match the HTTP version. This is optional because Gnutella servers have been reported to not specify HTTP version. */ if (p < end && *p == '/') { ++p; while (p < end && ISDIGIT (*p)) ++p; if (p < end && *p == '.') ++p; while (p < end && ISDIGIT (*p)) ++p; } while (p < end && ISSPACE (*p)) ++p; if (end - p < 3 || !ISDIGIT (p[0]) || !ISDIGIT (p[1]) || !ISDIGIT (p[2])) return -1; status = 100 * (p[0] - '0') + 10 * (p[1] - '0') + (p[2] - '0'); p += 3; if (message) { while (p < end && ISSPACE (*p)) ++p; while (p < end && ISSPACE (end[-1])) --end; *message = strdupdelim (p, end); } return status; } /* Release the resources used by RESP. */ static void resp_free (struct response *resp) { xfree_null (resp->headers); xfree (resp); } /* Print the server response, line by line, omitting the trailing CRLF from individual header lines, and prefixed with PREFIX. */ static void print_server_response (const struct response *resp, const char *prefix) { int i; if (!resp->headers) return; for (i = 0; resp->headers[i + 1]; i++) { const char *b = resp->headers[i]; const char *e = resp->headers[i + 1]; /* Skip CRLF */ if (b < e && e[-1] == '\n') --e; if (b < e && e[-1] == '\r') --e; /* This is safe even on printfs with broken handling of "%.s" because resp->headers ends with \0. */ logprintf (LOG_VERBOSE, "%s%.*s\n", prefix, e - b, b); } } /* Parse the `Content-Range' header and extract the information it contains. Returns true if successful, false otherwise. */ static bool parse_content_range (const char *hdr, wgint *first_byte_ptr, wgint *last_byte_ptr, wgint *entity_length_ptr) { wgint num; /* Ancient versions of Netscape proxy server, presumably predating rfc2068, sent out `Content-Range' without the "bytes" specifier. */ if (0 == strncasecmp (hdr, "bytes", 5)) { hdr += 5; /* "JavaWebServer/1.1.1" sends "bytes: x-y/z", contrary to the HTTP spec. */ if (*hdr == ':') ++hdr; while (ISSPACE (*hdr)) ++hdr; if (!*hdr) return false; } if (!ISDIGIT (*hdr)) return false; for (num = 0; ISDIGIT (*hdr); hdr++) num = 10 * num + (*hdr - '0'); if (*hdr != '-' || !ISDIGIT (*(hdr + 1))) return false; *first_byte_ptr = num; ++hdr; for (num = 0; ISDIGIT (*hdr); hdr++) num = 10 * num + (*hdr - '0'); if (*hdr != '/' || !ISDIGIT (*(hdr + 1))) return false; *last_byte_ptr = num; ++hdr; for (num = 0; ISDIGIT (*hdr); hdr++) num = 10 * num + (*hdr - '0'); *entity_length_ptr = num; return true; } /* Read the body of the request, but don't store it anywhere and don't display a progress gauge. This is useful for reading the bodies of administrative responses to which we will soon issue another request. The response is not useful to the user, but reading it allows us to continue using the same connection to the server. If reading fails, false is returned, true otherwise. In debug mode, the body is displayed for debugging purposes. */ static bool skip_short_body (int fd, wgint contlen) { enum { SKIP_SIZE = 512, /* size of the download buffer */ SKIP_THRESHOLD = 4096 /* the largest size we read */ }; char dlbuf[SKIP_SIZE + 1]; dlbuf[SKIP_SIZE] = '\0'; /* so DEBUGP can safely print it */ /* We shouldn't get here with unknown contlen. (This will change with HTTP/1.1, which supports "chunked" transfer.) */ assert (contlen != -1); /* If the body is too large, it makes more sense to simply close the connection than to try to read the body. */ if (contlen > SKIP_THRESHOLD) return false; DEBUGP (("Skipping %s bytes of body: [", number_to_static_string (contlen))); while (contlen > 0) { int ret = fd_read (fd, dlbuf, MIN (contlen, SKIP_SIZE), -1); if (ret <= 0) { /* Don't normally report the error since this is an optimization that should be invisible to the user. */ DEBUGP (("] aborting (%s).\n", ret < 0 ? strerror (errno) : "EOF received")); return false; } contlen -= ret; /* Safe even if %.*s bogusly expects terminating \0 because we've zero-terminated dlbuf above. */ DEBUGP (("%.*s", ret, dlbuf)); } DEBUGP (("] done.\n")); return true; } /* Persistent connections. Currently, we cache the most recently used connection as persistent, provided that the HTTP server agrees to make it such. The persistence data is stored in the variables below. Ideally, it should be possible to cache an arbitrary fixed number of these connections. */ /* Whether a persistent connection is active. */ static bool pconn_active; static struct { /* The socket of the connection. */ int socket; /* Host and port of the currently active persistent connection. */ char *host; int port; /* Whether a ssl handshake has occoured on this connection. */ bool ssl; /* Whether the connection was authorized. This is only done by NTLM, which authorizes *connections* rather than individual requests. (That practice is peculiar for HTTP, but it is a useful optimization.) */ bool authorized; #ifdef ENABLE_NTLM /* NTLM data of the current connection. */ struct ntlmdata ntlm; #endif } pconn; /* Mark the persistent connection as invalid and free the resources it uses. This is used by the CLOSE_* macros after they forcefully close a registered persistent connection. */ static void invalidate_persistent (void) { DEBUGP (("Disabling further reuse of socket %d.\n", pconn.socket)); pconn_active = false; fd_close (pconn.socket); xfree (pconn.host); xzero (pconn); } /* Register FD, which should be a TCP/IP connection to HOST:PORT, as persistent. This will enable someone to use the same connection later. In the context of HTTP, this must be called only AFTER the response has been received and the server has promised that the connection will remain alive. If a previous connection was persistent, it is closed. */ static void register_persistent (const char *host, int port, int fd, bool ssl) { if (pconn_active) { if (pconn.socket == fd) { /* The connection FD is already registered. */ return; } else { /* The old persistent connection is still active; close it first. This situation arises whenever a persistent connection exists, but we then connect to a different host, and try to register a persistent connection to that one. */ invalidate_persistent (); } } pconn_active = true; pconn.socket = fd; pconn.host = xstrdup (host); pconn.port = port; pconn.ssl = ssl; pconn.authorized = false; DEBUGP (("Registered socket %d for persistent reuse.\n", fd)); } /* Return true if a persistent connection is available for connecting to HOST:PORT. */ static bool persistent_available_p (const char *host, int port, bool ssl, bool *host_lookup_failed) { /* First, check whether a persistent connection is active at all. */ if (!pconn_active) return false; /* If we want SSL and the last connection wasn't or vice versa, don't use it. Checking for host and port is not enough because HTTP and HTTPS can apparently coexist on the same port. */ if (ssl != pconn.ssl) return false; /* If we're not connecting to the same port, we're not interested. */ if (port != pconn.port) return false; /* If the host is the same, we're in business. If not, there is still hope -- read below. */ if (0 != strcasecmp (host, pconn.host)) { /* Check if pconn.socket is talking to HOST under another name. This happens often when both sites are virtual hosts distinguished only by name and served by the same network interface, and hence the same web server (possibly set up by the ISP and serving many different web sites). This admittedly unconventional optimization does not contradict HTTP and works well with popular server software. */ bool found; ip_address ip; struct address_list *al; if (ssl) /* Don't try to talk to two different SSL sites over the same secure connection! (Besides, it's not clear that name-based virtual hosting is even possible with SSL.) */ return false; /* If pconn.socket's peer is one of the IP addresses HOST resolves to, pconn.socket is for all intents and purposes already talking to HOST. */ if (!socket_ip_address (pconn.socket, &ip, ENDPOINT_PEER)) { /* Can't get the peer's address -- something must be very wrong with the connection. */ invalidate_persistent (); return false; } al = lookup_host (host, 0); if (!al) { *host_lookup_failed = true; return false; } found = address_list_contains (al, &ip); address_list_release (al); if (!found) return false; /* The persistent connection's peer address was found among the addresses HOST resolved to; therefore, pconn.sock is in fact already talking to HOST -- no need to reconnect. */ } /* Finally, check whether the connection is still open. This is important because most servers implement liberal (short) timeout on persistent connections. Wget can of course always reconnect if the connection doesn't work out, but it's nicer to know in advance. This test is a logical followup of the first test, but is "expensive" and therefore placed at the end of the list. (Current implementation of test_socket_open has a nice side effect that it treats sockets with pending data as "closed". This is exactly what we want: if a broken server sends message body in response to HEAD, or if it sends more than conent-length data, we won't reuse the corrupted connection.) */ if (!test_socket_open (pconn.socket)) { /* Oops, the socket is no longer open. Now that we know that, let's invalidate the persistent connection before returning 0. */ invalidate_persistent (); return false; } return true; } /* The idea behind these two CLOSE macros is to distinguish between two cases: one when the job we've been doing is finished, and we want to close the connection and leave, and two when something is seriously wrong and we're closing the connection as part of cleanup. In case of keep_alive, CLOSE_FINISH should leave the connection open, while CLOSE_INVALIDATE should still close it. Note that the semantics of the flag `keep_alive' is "this connection *will* be reused (the server has promised not to close the connection once we're done)", while the semantics of `pc_active_p && (fd) == pc_last_fd' is "we're *now* using an active, registered connection". */ #define CLOSE_FINISH(fd) do { \ if (!keep_alive) \ { \ if (pconn_active && (fd) == pconn.socket) \ invalidate_persistent (); \ else \ { \ fd_close (fd); \ fd = -1; \ } \ } \ } while (0) #define CLOSE_INVALIDATE(fd) do { \ if (pconn_active && (fd) == pconn.socket) \ invalidate_persistent (); \ else \ fd_close (fd); \ fd = -1; \ } while (0) struct http_stat { wgint len; /* received length */ wgint contlen; /* expected length */ wgint restval; /* the restart value */ int res; /* the result of last read */ char *newloc; /* new location (redirection) */ char *remote_time; /* remote time-stamp string */ char *error; /* textual HTTP error */ int statcode; /* status code */ wgint rd_size; /* amount of data read from socket */ double dltime; /* time it took to download the data */ const char *referer; /* value of the referer header. */ char **local_file; /* local file. */ }; static void free_hstat (struct http_stat *hs) { xfree_null (hs->newloc); xfree_null (hs->remote_time); xfree_null (hs->error); /* Guard against being called twice. */ hs->newloc = NULL; hs->remote_time = NULL; hs->error = NULL; } static char *create_authorization_line (const char *, const char *, const char *, const char *, const char *, bool *); static char *basic_authentication_encode (const char *, const char *); static bool known_authentication_scheme_p (const char *, const char *); #define BEGINS_WITH(line, string_constant) \ (!strncasecmp (line, string_constant, sizeof (string_constant) - 1) \ && (ISSPACE (line[sizeof (string_constant) - 1]) \ || !line[sizeof (string_constant) - 1])) #define SET_USER_AGENT(req) do { \ if (!opt.useragent) \ request_set_header (req, "User-Agent", \ aprintf ("Wget/%s", version_string), rel_value); \ else if (*opt.useragent) \ request_set_header (req, "User-Agent", opt.useragent, rel_none); \ } while (0) /* The flags that allow clobbering the file (opening with "wb"). Defined here to avoid repetition later. #### This will require rework. */ #define ALLOW_CLOBBER (opt.noclobber || opt.always_rest || opt.timestamping \ || opt.dirstruct || opt.output_document) /* Retrieve a document through HTTP protocol. It recognizes status code, and correctly handles redirections. It closes the network socket. If it receives an error from the functions below it, it will print it if there is enough information to do so (almost always), returning the error to the caller (i.e. http_loop). Various HTTP parameters are stored to hs. If PROXY is non-NULL, the connection will be made to the proxy server, and u->url will be requested. */ static uerr_t gethttp (struct url *u, struct http_stat *hs, int *dt, struct url *proxy) { struct request *req; char *type; char *user, *passwd; char *proxyauth; int statcode; int write_error; wgint contlen, contrange; struct url *conn; FILE *fp; int sock = -1; int flags; /* Set to 1 when the authorization has failed permanently and should not be tried again. */ bool auth_finished = false; /* Whether NTLM authentication is used for this request. */ bool ntlm_seen = false; /* Whether our connection to the remote host is through SSL. */ bool using_ssl = false; /* Whether a HEAD request will be issued (as opposed to GET or POST). */ bool head_only = !!(*dt & HEAD_ONLY); char *head; struct response *resp; char hdrval[256]; char *message; /* Whether this connection will be kept alive after the HTTP request is done. */ bool keep_alive; /* Whether keep-alive should be inhibited. RFC 2068 requests that 1.0 clients not send keep-alive requests to proxies. This is because many 1.0 proxies do not interpret the Connection header and transfer it to the remote server, causing it to not close the connection and leave both the proxy and the client hanging. */ bool inhibit_keep_alive = !opt.http_keep_alive || opt.ignore_length || proxy != NULL; /* Headers sent when using POST. */ wgint post_data_size = 0; bool host_lookup_failed = false; #ifdef HAVE_SSL if (u->scheme == SCHEME_HTTPS) { /* Initialize the SSL context. After this has once been done, it becomes a no-op. */ if (!ssl_init ()) { scheme_disable (SCHEME_HTTPS); logprintf (LOG_NOTQUIET, _("Disabling SSL due to encountered errors.\n")); return SSLINITFAILED; } } #endif /* HAVE_SSL */ if (!head_only) /* If we're doing a GET on the URL, as opposed to just a HEAD, we need to know the local filename so we can save to it. */ assert (*hs->local_file != NULL); /* Initialize certain elements of struct http_stat. */ hs->len = 0; hs->contlen = -1; hs->res = -1; hs->newloc = NULL; hs->remote_time = NULL; hs->error = NULL; conn = u; /* Prepare the request to send. */ req = request_new (); { char *meth_arg; const char *meth = "GET"; if (head_only) meth = "HEAD"; else if (opt.post_file_name || opt.post_data) meth = "POST"; /* Use the full path, i.e. one that includes the leading slash and the query string. E.g. if u->path is "foo/bar" and u->query is "param=value", full_path will be "/foo/bar?param=value". */ if (proxy #ifdef HAVE_SSL /* When using SSL over proxy, CONNECT establishes a direct connection to the HTTPS server. Therefore use the same argument as when talking to the server directly. */ && u->scheme != SCHEME_HTTPS #endif ) meth_arg = xstrdup (u->url); else meth_arg = url_full_path (u); request_set_method (req, meth, meth_arg); } request_set_header (req, "Referer", (char *) hs->referer, rel_none); if (*dt & SEND_NOCACHE) request_set_header (req, "Pragma", "no-cache", rel_none); if (hs->restval) request_set_header (req, "Range", aprintf ("bytes=%s-", number_to_static_string (hs->restval)), rel_value); SET_USER_AGENT (req); request_set_header (req, "Accept", "*/*", rel_none); /* Find the username and password for authentication. */ user = u->user; passwd = u->passwd; search_netrc (u->host, (const char **)&user, (const char **)&passwd, 0); user = user ? user : (opt.http_user ? opt.http_user : opt.user); passwd = passwd ? passwd : (opt.http_passwd ? opt.http_passwd : opt.passwd); if (user && passwd) { /* We have the username and the password, but haven't tried any authorization yet. Let's see if the "Basic" method works. If not, we'll come back here and construct a proper authorization method with the right challenges. If we didn't employ this kind of logic, every URL that requires authorization would have to be processed twice, which is very suboptimal and generates a bunch of false "unauthorized" errors in the server log. #### But this logic also has a serious problem when used with stronger authentications: we *first* transmit the username and the password in clear text, and *then* attempt a stronger authentication scheme. That cannot be right! We are only fortunate that almost everyone still uses the `Basic' scheme anyway. There should be an option to prevent this from happening, for those who use strong authentication schemes and value their passwords. */ request_set_header (req, "Authorization", basic_authentication_encode (user, passwd), rel_value); } proxyauth = NULL; if (proxy) { char *proxy_user, *proxy_passwd; /* For normal username and password, URL components override command-line/wgetrc parameters. With proxy authentication, it's the reverse, because proxy URLs are normally the "permanent" ones, so command-line args should take precedence. */ if (opt.proxy_user && opt.proxy_passwd) { proxy_user = opt.proxy_user; proxy_passwd = opt.proxy_passwd; } else { proxy_user = proxy->user; proxy_passwd = proxy->passwd; } /* #### This does not appear right. Can't the proxy request, say, `Digest' authentication? */ if (proxy_user && proxy_passwd) proxyauth = basic_authentication_encode (proxy_user, proxy_passwd); /* If we're using a proxy, we will be connecting to the proxy server. */ conn = proxy; /* Proxy authorization over SSL is handled below. */ #ifdef HAVE_SSL if (u->scheme != SCHEME_HTTPS) #endif request_set_header (req, "Proxy-Authorization", proxyauth, rel_value); } /* Generate the Host header, HOST:PORT. Take into account that: - Broken server-side software often doesn't recognize the PORT argument, so we must generate "Host: www.server.com" instead of "Host: www.server.com:80" (and likewise for https port). - IPv6 addresses contain ":", so "Host: 3ffe:8100:200:2::2:1234" becomes ambiguous and needs to be rewritten as "Host: [3ffe:8100:200:2::2]:1234". */ { /* Formats arranged for hfmt[add_port][add_squares]. */ static const char *hfmt[][2] = { { "%s", "[%s]" }, { "%s:%d", "[%s]:%d" } }; int add_port = u->port != scheme_default_port (u->scheme); int add_squares = strchr (u->host, ':') != NULL; request_set_header (req, "Host", aprintf (hfmt[add_port][add_squares], u->host, u->port), rel_value); } if (!inhibit_keep_alive) request_set_header (req, "Connection", "Keep-Alive", rel_none); if (opt.cookies) request_set_header (req, "Cookie", cookie_header (wget_cookie_jar, u->host, u->port, u->path, #ifdef HAVE_SSL u->scheme == SCHEME_HTTPS #else 0 #endif ), rel_value); if (opt.post_data || opt.post_file_name) { request_set_header (req, "Content-Type", "application/x-www-form-urlencoded", rel_none); if (opt.post_data) post_data_size = strlen (opt.post_data); else { post_data_size = file_size (opt.post_file_name); if (post_data_size == -1) { logprintf (LOG_NOTQUIET, _("POST data file `%s' missing: %s\n"), opt.post_file_name, strerror (errno)); post_data_size = 0; } } request_set_header (req, "Content-Length", xstrdup (number_to_static_string (post_data_size)), rel_value); } /* Add the user headers. */ if (opt.user_headers) { int i; for (i = 0; opt.user_headers[i]; i++) request_set_user_header (req, opt.user_headers[i]); } retry_with_auth: /* We need to come back here when the initial attempt to retrieve without authorization header fails. (Expected to happen at least for the Digest authorization scheme.) */ keep_alive = false; /* Establish the connection. */ if (!inhibit_keep_alive) { /* Look for a persistent connection to target host, unless a proxy is used. The exception is when SSL is in use, in which case the proxy is nothing but a passthrough to the target host, registered as a connection to the latter. */ struct url *relevant = conn; #ifdef HAVE_SSL if (u->scheme == SCHEME_HTTPS) relevant = u; #endif if (persistent_available_p (relevant->host, relevant->port, #ifdef HAVE_SSL relevant->scheme == SCHEME_HTTPS, #else 0, #endif &host_lookup_failed)) { sock = pconn.socket; using_ssl = pconn.ssl; logprintf (LOG_VERBOSE, _("Reusing existing connection to %s:%d.\n"), escnonprint (pconn.host), pconn.port); DEBUGP (("Reusing fd %d.\n", sock)); if (pconn.authorized) /* If the connection is already authorized, the "Basic" authorization added by code above is unnecessary and only hurts us. */ request_remove_header (req, "Authorization"); } } if (sock < 0) { /* In its current implementation, persistent_available_p will look up conn->host in some cases. If that lookup failed, we don't need to bother with connect_to_host. */ if (host_lookup_failed) { request_free (req); return HOSTERR; } sock = connect_to_host (conn->host, conn->port); if (sock == E_HOST) { request_free (req); return HOSTERR; } else if (sock < 0) { request_free (req); return (retryable_socket_connect_error (errno) ? CONERROR : CONIMPOSSIBLE); } #ifdef HAVE_SSL if (proxy && u->scheme == SCHEME_HTTPS) { /* When requesting SSL URLs through proxies, use the CONNECT method to request passthrough. */ struct request *connreq = request_new (); request_set_method (connreq, "CONNECT", aprintf ("%s:%d", u->host, u->port)); SET_USER_AGENT (connreq); if (proxyauth) { request_set_header (connreq, "Proxy-Authorization", proxyauth, rel_value); /* Now that PROXYAUTH is part of the CONNECT request, zero it out so we don't send proxy authorization with the regular request below. */ proxyauth = NULL; } /* Examples in rfc2817 use the Host header in CONNECT requests. I don't see how that gains anything, given that the contents of Host would be exactly the same as the contents of CONNECT. */ write_error = request_send (connreq, sock); request_free (connreq); if (write_error < 0) { logprintf (LOG_VERBOSE, _("Failed writing to proxy: %s.\n"), strerror (errno)); CLOSE_INVALIDATE (sock); return WRITEFAILED; } head = read_http_response_head (sock); if (!head) { logprintf (LOG_VERBOSE, _("Failed reading proxy response: %s\n"), strerror (errno)); CLOSE_INVALIDATE (sock); return HERR; } message = NULL; if (!*head) { xfree (head); goto failed_tunnel; } DEBUGP (("proxy responded with: [%s]\n", head)); resp = resp_new (head); statcode = resp_status (resp, &message); resp_free (resp); xfree (head); if (statcode != 200) { failed_tunnel: logprintf (LOG_NOTQUIET, _("Proxy tunneling failed: %s"), message ? escnonprint (message) : "?"); xfree_null (message); return CONSSLERR; } xfree_null (message); /* SOCK is now *really* connected to u->host, so update CONN to reflect this. That way register_persistent will register SOCK as being connected to u->host:u->port. */ conn = u; } if (conn->scheme == SCHEME_HTTPS) { if (!ssl_connect (sock) || !ssl_check_certificate (sock, u->host)) { fd_close (sock); return CONSSLERR; } using_ssl = true; } #endif /* HAVE_SSL */ } /* Send the request to server. */ write_error = request_send (req, sock); if (write_error >= 0) { if (opt.post_data) { DEBUGP (("[POST data: %s]\n", opt.post_data)); write_error = fd_write (sock, opt.post_data, post_data_size, -1); } else if (opt.post_file_name && post_data_size != 0) write_error = post_file (sock, opt.post_file_name, post_data_size); } if (write_error < 0) { logprintf (LOG_VERBOSE, _("Failed writing HTTP request: %s.\n"), strerror (errno)); CLOSE_INVALIDATE (sock); request_free (req); return WRITEFAILED; } logprintf (LOG_VERBOSE, _("%s request sent, awaiting response... "), proxy ? "Proxy" : "HTTP"); contlen = -1; contrange = 0; *dt &= ~RETROKF; head = read_http_response_head (sock); if (!head) { if (errno == 0) { logputs (LOG_NOTQUIET, _("No data received.\n")); CLOSE_INVALIDATE (sock); request_free (req); return HEOF; } else { logprintf (LOG_NOTQUIET, _("Read error (%s) in headers.\n"), strerror (errno)); CLOSE_INVALIDATE (sock); request_free (req); return HERR; } } DEBUGP (("\n---response begin---\n%s---response end---\n", head)); resp = resp_new (head); /* Check for status line. */ message = NULL; statcode = resp_status (resp, &message); if (!opt.server_response) logprintf (LOG_VERBOSE, "%2d %s\n", statcode, message ? escnonprint (message) : ""); else { logprintf (LOG_VERBOSE, "\n"); print_server_response (resp, " "); } if (!opt.ignore_length && resp_header_copy (resp, "Content-Length", hdrval, sizeof (hdrval))) { wgint parsed; errno = 0; parsed = str_to_wgint (hdrval, NULL, 10); if (parsed == WGINT_MAX && errno == ERANGE) /* Out of range. #### If Content-Length is out of range, it most likely means that the file is larger than 2G and that we're compiled without LFS. In that case we should probably refuse to even attempt to download the file. */ contlen = -1; else contlen = parsed; } /* Check for keep-alive related responses. */ if (!inhibit_keep_alive && contlen != -1) { if (resp_header_copy (resp, "Keep-Alive", NULL, 0)) keep_alive = true; else if (resp_header_copy (resp, "Connection", hdrval, sizeof (hdrval))) { if (0 == strcasecmp (hdrval, "Keep-Alive")) keep_alive = true; } } if (keep_alive) /* The server has promised that it will not close the connection when we're done. This means that we can register it. */ register_persistent (conn->host, conn->port, sock, using_ssl); if (statcode == HTTP_STATUS_UNAUTHORIZED) { /* Authorization is required. */ if (keep_alive && !head_only && skip_short_body (sock, contlen)) CLOSE_FINISH (sock); else CLOSE_INVALIDATE (sock); pconn.authorized = false; if (!auth_finished && (user && passwd)) { /* IIS sends multiple copies of WWW-Authenticate, one with the value "negotiate", and other(s) with data. Loop over all the occurrences and pick the one we recognize. */ int wapos; const char *wabeg, *waend; char *www_authenticate = NULL; for (wapos = 0; (wapos = resp_header_locate (resp, "WWW-Authenticate", wapos, &wabeg, &waend)) != -1; ++wapos) if (known_authentication_scheme_p (wabeg, waend)) { BOUNDED_TO_ALLOCA (wabeg, waend, www_authenticate); break; } if (!www_authenticate) /* If the authentication header is missing or unrecognized, there's no sense in retrying. */ logputs (LOG_NOTQUIET, _("Unknown authentication scheme.\n")); else if (BEGINS_WITH (www_authenticate, "Basic")) /* If the authentication scheme is "Basic", which we send by default, there's no sense in retrying either. (This should be changed when we stop sending "Basic" data by default.) */ ; else { char *pth; pth = url_full_path (u); request_set_header (req, "Authorization", create_authorization_line (www_authenticate, user, passwd, request_method (req), pth, &auth_finished), rel_value); if (BEGINS_WITH (www_authenticate, "NTLM")) ntlm_seen = true; xfree (pth); goto retry_with_auth; } } logputs (LOG_NOTQUIET, _("Authorization failed.\n")); request_free (req); return AUTHFAILED; } else /* statcode != HTTP_STATUS_UNAUTHORIZED */ { /* Kludge: if NTLM is used, mark the TCP connection as authorized. */ if (ntlm_seen) pconn.authorized = true; } request_free (req); hs->statcode = statcode; if (statcode == -1) hs->error = xstrdup (_("Malformed status line")); else if (!*message) hs->error = xstrdup (_("(no description)")); else hs->error = xstrdup (message); xfree (message); type = resp_header_strdup (resp, "Content-Type"); if (type) { char *tmp = strchr (type, ';'); if (tmp) { while (tmp > type && ISSPACE (tmp[-1])) --tmp; *tmp = '\0'; } } hs->newloc = resp_header_strdup (resp, "Location"); hs->remote_time = resp_header_strdup (resp, "Last-Modified"); /* Handle (possibly multiple instances of) the Set-Cookie header. */ if (opt.cookies) { int scpos; const char *scbeg, *scend; /* The jar should have been created by now. */ assert (wget_cookie_jar != NULL); for (scpos = 0; (scpos = resp_header_locate (resp, "Set-Cookie", scpos, &scbeg, &scend)) != -1; ++scpos) { char *set_cookie; BOUNDED_TO_ALLOCA (scbeg, scend, set_cookie); cookie_handle_set_cookie (wget_cookie_jar, u->host, u->port, u->path, set_cookie); } } if (resp_header_copy (resp, "Content-Range", hdrval, sizeof (hdrval))) { wgint first_byte_pos, last_byte_pos, entity_length; if (parse_content_range (hdrval, &first_byte_pos, &last_byte_pos, &entity_length)) contrange = first_byte_pos; } resp_free (resp); /* 20x responses are counted among successful by default. */ if (H_20X (statcode)) *dt |= RETROKF; /* Return if redirected. */ if (H_REDIRECTED (statcode) || statcode == HTTP_STATUS_MULTIPLE_CHOICES) { /* RFC2068 says that in case of the 300 (multiple choices) response, the server can output a preferred URL through `Location' header; otherwise, the request should be treated like GET. So, if the location is set, it will be a redirection; otherwise, just proceed normally. */ if (statcode == HTTP_STATUS_MULTIPLE_CHOICES && !hs->newloc) *dt |= RETROKF; else { logprintf (LOG_VERBOSE, _("Location: %s%s\n"), hs->newloc ? escnonprint_uri (hs->newloc) : _("unspecified"), hs->newloc ? _(" [following]") : ""); if (keep_alive && !head_only && skip_short_body (sock, contlen)) CLOSE_FINISH (sock); else CLOSE_INVALIDATE (sock); xfree_null (type); return NEWLOCATION; } } /* If content-type is not given, assume text/html. This is because of the multitude of broken CGI's that "forget" to generate the content-type. */ if (!type || 0 == strncasecmp (type, TEXTHTML_S, strlen (TEXTHTML_S)) || 0 == strncasecmp (type, TEXTXHTML_S, strlen (TEXTXHTML_S))) *dt |= TEXTHTML; else *dt &= ~TEXTHTML; if (opt.html_extension && (*dt & TEXTHTML)) /* -E / --html-extension / html_extension = on was specified, and this is a text/html file. If some case-insensitive variation on ".htm[l]" isn't already the file's suffix, tack on ".html". */ { char *last_period_in_local_filename = strrchr (*hs->local_file, '.'); if (last_period_in_local_filename == NULL || !(0 == strcasecmp (last_period_in_local_filename, ".htm") || 0 == strcasecmp (last_period_in_local_filename, ".html"))) { int local_filename_len = strlen (*hs->local_file); /* Resize the local file, allowing for ".html" preceded by optional ".NUMBER". */ *hs->local_file = xrealloc (*hs->local_file, local_filename_len + 24 + sizeof (".html")); strcpy(*hs->local_file + local_filename_len, ".html"); /* If clobbering is not allowed and the file, as named, exists, tack on ".NUMBER.html" instead. */ if (!ALLOW_CLOBBER) { int ext_num = 1; do sprintf (*hs->local_file + local_filename_len, ".%d.html", ext_num++); while (file_exists_p (*hs->local_file)); } *dt |= ADDED_HTML_EXTENSION; } } if (statcode == HTTP_STATUS_RANGE_NOT_SATISFIABLE) { /* If `-c' is in use and the file has been fully downloaded (or the remote file has shrunk), Wget effectively requests bytes after the end of file and the server response with 416. */ logputs (LOG_VERBOSE, _("\ \n The file is already fully retrieved; nothing to do.\n\n")); /* In case the caller inspects. */ hs->len = contlen; hs->res = 0; /* Mark as successfully retrieved. */ *dt |= RETROKF; xfree_null (type); CLOSE_INVALIDATE (sock); /* would be CLOSE_FINISH, but there might be more bytes in the body. */ return RETRUNNEEDED; } if ((contrange != 0 && contrange != hs->restval) || (H_PARTIAL (statcode) && !contrange)) { /* The Range request was somehow misunderstood by the server. Bail out. */ xfree_null (type); CLOSE_INVALIDATE (sock); return RANGEERR; } hs->contlen = contlen + contrange; if (opt.verbose) { if (*dt & RETROKF) { /* No need to print this output if the body won't be downloaded at all, or if the original server response is printed. */ logputs (LOG_VERBOSE, _("Length: ")); if (contlen != -1) { logputs (LOG_VERBOSE, number_to_static_string (contlen + contrange)); if (contlen + contrange >= 1024) logprintf (LOG_VERBOSE, " (%s)", human_readable (contlen + contrange)); if (contrange) { if (contlen >= 1024) logprintf (LOG_VERBOSE, _(", %s (%s) remaining"), number_to_static_string (contlen), human_readable (contlen)); else logprintf (LOG_VERBOSE, _(", %s remaining"), number_to_static_string (contlen)); } } else logputs (LOG_VERBOSE, opt.ignore_length ? _("ignored") : _("unspecified")); if (type) logprintf (LOG_VERBOSE, " [%s]\n", escnonprint (type)); else logputs (LOG_VERBOSE, "\n"); } } xfree_null (type); type = NULL; /* We don't need it any more. */ /* Return if we have no intention of further downloading. */ if (!(*dt & RETROKF) || head_only) { /* In case the caller cares to look... */ hs->len = 0; hs->res = 0; xfree_null (type); if (head_only) /* Pre-1.10 Wget used CLOSE_INVALIDATE here. Now we trust the servers not to send body in response to a HEAD request. If you encounter such a server (more likely a broken CGI), use `--no-http-keep-alive'. */ CLOSE_FINISH (sock); else if (keep_alive && skip_short_body (sock, contlen)) /* Successfully skipped the body; also keep using the socket. */ CLOSE_FINISH (sock); else CLOSE_INVALIDATE (sock); return RETRFINISHED; } /* Open the local file. */ if (!output_stream) { mkalldirs (*hs->local_file); if (opt.backups) rotate_backups (*hs->local_file); if (hs->restval) fp = fopen (*hs->local_file, "ab"); else if (ALLOW_CLOBBER) fp = fopen (*hs->local_file, "wb"); else { fp = fopen_excl (*hs->local_file, true); if (!fp && errno == EEXIST) { /* We cannot just invent a new name and use it (which is what functions like unique_create typically do) because we told the user we'd use this name. Instead, return and retry the download. */ logprintf (LOG_NOTQUIET, _("%s has sprung into existence.\n"), *hs->local_file); CLOSE_INVALIDATE (sock); return FOPEN_EXCL_ERR; } } if (!fp) { logprintf (LOG_NOTQUIET, "%s: %s\n", *hs->local_file, strerror (errno)); CLOSE_INVALIDATE (sock); return FOPENERR; } } else fp = output_stream; /* #### This confuses the timestamping code that checks for file size. Maybe we should save some additional information? */ if (opt.save_headers) fwrite (head, 1, strlen (head), fp); /* Now we no longer need to store the response header. */ xfree (head); /* Download the request body. */ flags = 0; if (keep_alive) flags |= rb_read_exactly; if (hs->restval > 0 && contrange == 0) /* If the server ignored our range request, instruct fd_read_body to skip the first RESTVAL bytes of body. */ flags |= rb_skip_startpos; hs->len = hs->restval; hs->rd_size = 0; hs->res = fd_read_body (sock, fp, contlen != -1 ? contlen : 0, hs->restval, &hs->rd_size, &hs->len, &hs->dltime, flags); if (hs->res >= 0) CLOSE_FINISH (sock); else CLOSE_INVALIDATE (sock); { /* Close or flush the file. We have to be careful to check for error here. Checking the result of fwrite() is not enough -- errors could go unnoticed! */ int flush_res; if (!output_stream) flush_res = fclose (fp); else flush_res = fflush (fp); if (flush_res == EOF) hs->res = -2; } if (hs->res == -2) return FWRITEERR; return RETRFINISHED; } /* The genuine HTTP loop! This is the part where the retrieval is retried, and retried, and retried, and... */ uerr_t http_loop (struct url *u, char **newloc, char **local_file, const char *referer, int *dt, struct url *proxy) { int count; bool use_ts, got_head = false;/* time-stamping info */ char *filename_plus_orig_suffix; char *local_filename = NULL; char *tms, *locf; const char *tmrate; uerr_t err; time_t tml = -1, tmr = -1; /* local and remote time-stamps */ wgint local_size = 0; /* the size of the local file */ size_t filename_len; struct http_stat hstat; /* HTTP status */ struct_stat st; char *dummy = NULL; /* This used to be done in main(), but it's a better idea to do it here so that we don't go through the hoops if we're just using FTP or whatever. */ if (opt.cookies) { if (!wget_cookie_jar) wget_cookie_jar = cookie_jar_new (); if (opt.cookies_input && !cookies_loaded_p) { cookie_jar_load (wget_cookie_jar, opt.cookies_input); cookies_loaded_p = true; } } *newloc = NULL; /* Warn on (likely bogus) wildcard usage in HTTP. */ if (opt.ftp_glob && has_wildcards_p (u->path)) logputs (LOG_VERBOSE, _("Warning: wildcards not supported in HTTP.\n")); xzero (hstat); /* Determine the local filename. */ if (local_file && *local_file) hstat.local_file = local_file; else if (local_file && !opt.output_document) { *local_file = url_file_name (u); hstat.local_file = local_file; } else { dummy = url_file_name (u); hstat.local_file = &dummy; /* be honest about where we will save the file */ if (local_file && opt.output_document) *local_file = HYPHENP (opt.output_document) ? NULL : xstrdup (opt.output_document); } if (!opt.output_document) locf = *hstat.local_file; else locf = opt.output_document; hstat.referer = referer; filename_len = strlen (*hstat.local_file); filename_plus_orig_suffix = alloca (filename_len + sizeof (".orig")); if (opt.noclobber && file_exists_p (*hstat.local_file)) { /* If opt.noclobber is turned on and file already exists, do not retrieve the file */ logprintf (LOG_VERBOSE, _("\ File `%s' already there; not retrieving.\n\n"), *hstat.local_file); /* If the file is there, we suppose it's retrieved OK. */ *dt |= RETROKF; /* #### Bogusness alert. */ /* If its suffix is "html" or "htm" or similar, assume text/html. */ if (has_html_suffix_p (*hstat.local_file)) *dt |= TEXTHTML; xfree_null (dummy); return RETROK; } use_ts = false; if (opt.timestamping) { bool local_dot_orig_file_exists = false; if (opt.backup_converted) /* If -K is specified, we'll act on the assumption that it was specified last time these files were downloaded as well, and instead of just comparing local file X against server file X, we'll compare local file X.orig (if extant, else X) against server file X. If -K _wasn't_ specified last time, or the server contains files called *.orig, -N will be back to not operating correctly with -k. */ { /* Would a single s[n]printf() call be faster? --dan Definitely not. sprintf() is horribly slow. It's a different question whether the difference between the two affects a program. Usually I'd say "no", but at one point I profiled Wget, and found that a measurable and non-negligible amount of time was lost calling sprintf() in url.c. Replacing sprintf with inline calls to strcpy() and number_to_string() made a difference. --hniksic */ memcpy (filename_plus_orig_suffix, *hstat.local_file, filename_len); memcpy (filename_plus_orig_suffix + filename_len, ".orig", sizeof (".orig")); /* Try to stat() the .orig file. */ if (stat (filename_plus_orig_suffix, &st) == 0) { local_dot_orig_file_exists = 1; local_filename = filename_plus_orig_suffix; } } if (!local_dot_orig_file_exists) /* Couldn't stat() .orig, so try to stat() . */ if (stat (*hstat.local_file, &st) == 0) local_filename = *hstat.local_file; if (local_filename != NULL) /* There was a local file, so we'll check later to see if the version the server has is the same version we already have, allowing us to skip a download. */ { use_ts = true; tml = st.st_mtime; #ifdef WINDOWS /* Modification time granularity is 2 seconds for Windows, so increase local time by 1 second for later comparison. */ tml++; #endif local_size = st.st_size; got_head = false; } } /* Reset the counter. */ count = 0; *dt = 0; /* THE loop */ do { /* Increment the pass counter. */ ++count; sleep_between_retrievals (count); /* Get the current time string. */ tms = time_str (NULL); /* Print fetch message, if opt.verbose. */ if (opt.verbose) { char *hurl = url_string (u, true); char tmp[256]; strcpy (tmp, " "); if (count > 1) sprintf (tmp, _("(try:%2d)"), count); logprintf (LOG_VERBOSE, "--%s-- %s\n %s => `%s'\n", tms, hurl, tmp, locf); #ifdef WINDOWS ws_changetitle (hurl); #endif xfree (hurl); } /* Default document type is empty. However, if spider mode is on or time-stamping is employed, HEAD_ONLY commands is encoded within *dt. */ if (opt.spider || (use_ts && !got_head)) *dt |= HEAD_ONLY; else *dt &= ~HEAD_ONLY; /* Decide whether or not to restart. */ if (opt.always_rest && stat (locf, &st) == 0 && S_ISREG (st.st_mode)) /* When -c is used, continue from on-disk size. (Can't use hstat.len even if count>1 because we don't want a failed first attempt to clobber existing data.) */ hstat.restval = st.st_size; else if (count > 1) /* otherwise, continue where the previous try left off */ hstat.restval = hstat.len; else hstat.restval = 0; /* Decide whether to send the no-cache directive. We send it in two cases: a) we're using a proxy, and we're past our first retrieval. Some proxies are notorious for caching incomplete data, so we require a fresh get. b) caching is explicitly inhibited. */ if ((proxy && count > 1) /* a */ || !opt.allow_cache /* b */ ) *dt |= SEND_NOCACHE; else *dt &= ~SEND_NOCACHE; /* Try fetching the document, or at least its head. */ err = gethttp (u, &hstat, dt, proxy); /* It's unfortunate that wget determines the local filename before finding out the Content-Type of the file. Barring a major restructuring of the code, we need to re-set locf here, since gethttp() may have xrealloc()d *hstat.local_file to tack on ".html". */ if (!opt.output_document) locf = *hstat.local_file; /* Time? */ tms = time_str (NULL); /* Get the new location (with or without the redirection). */ if (hstat.newloc) *newloc = xstrdup (hstat.newloc); switch (err) { case HERR: case HEOF: case CONSOCKERR: case CONCLOSED: case CONERROR: case READERR: case WRITEFAILED: case RANGEERR: case FOPEN_EXCL_ERR: /* Non-fatal errors continue executing the loop, which will bring them to "while" statement at the end, to judge whether the number of tries was exceeded. */ free_hstat (&hstat); printwhat (count, opt.ntry); if (err == FOPEN_EXCL_ERR) { /* Re-determine the file name. */ if (local_file && *local_file) { xfree (*local_file); *local_file = url_file_name (u); hstat.local_file = local_file; } else { xfree (dummy); dummy = url_file_name (u); hstat.local_file = &dummy; } /* be honest about where we will save the file */ if (local_file && opt.output_document) *local_file = HYPHENP (opt.output_document) ? NULL : xstrdup (opt.output_document); if (!opt.output_document) locf = *hstat.local_file; else locf = opt.output_document; } continue; case HOSTERR: case CONIMPOSSIBLE: case PROXERR: case AUTHFAILED: case SSLINITFAILED: case CONTNOTSUPPORTED: /* Fatal errors just return from the function. */ free_hstat (&hstat); xfree_null (dummy); return err; case FWRITEERR: case FOPENERR: /* Another fatal error. */ logputs (LOG_VERBOSE, "\n"); logprintf (LOG_NOTQUIET, _("Cannot write to `%s' (%s).\n"), *hstat.local_file, strerror (errno)); free_hstat (&hstat); xfree_null (dummy); return err; case CONSSLERR: /* Another fatal error. */ logprintf (LOG_NOTQUIET, _("Unable to establish SSL connection.\n")); free_hstat (&hstat); xfree_null (dummy); return err; case NEWLOCATION: /* Return the new location to the caller. */ if (!hstat.newloc) { logprintf (LOG_NOTQUIET, _("ERROR: Redirection (%d) without location.\n"), hstat.statcode); free_hstat (&hstat); xfree_null (dummy); return WRONGCODE; } free_hstat (&hstat); xfree_null (dummy); return NEWLOCATION; case RETRUNNEEDED: /* The file was already fully retrieved. */ free_hstat (&hstat); xfree_null (dummy); return RETROK; case RETRFINISHED: /* Deal with you later. */ break; default: /* All possibilities should have been exhausted. */ abort (); } if (!(*dt & RETROKF)) { if (!opt.verbose) { /* #### Ugly ugly ugly! */ char *hurl = url_string (u, true); logprintf (LOG_NONVERBOSE, "%s:\n", hurl); xfree (hurl); } logprintf (LOG_NOTQUIET, _("%s ERROR %d: %s.\n"), tms, hstat.statcode, escnonprint (hstat.error)); logputs (LOG_VERBOSE, "\n"); free_hstat (&hstat); xfree_null (dummy); return WRONGCODE; } /* Did we get the time-stamp? */ if (!got_head) { if (opt.timestamping && !hstat.remote_time) { logputs (LOG_NOTQUIET, _("\ Last-modified header missing -- time-stamps turned off.\n")); } else if (hstat.remote_time) { /* Convert the date-string into struct tm. */ tmr = http_atotm (hstat.remote_time); if (tmr == (time_t) (-1)) logputs (LOG_VERBOSE, _("\ Last-modified header invalid -- time-stamp ignored.\n")); } } /* The time-stamping section. */ if (use_ts) { got_head = true; *dt &= ~HEAD_ONLY; use_ts = false; /* no more time-stamping */ count = 0; /* the retrieve count for HEAD is reset */ if (hstat.remote_time && tmr != (time_t) (-1)) { /* Now time-stamping can be used validly. Time-stamping means that if the sizes of the local and remote file match, and local file is newer than the remote file, it will not be retrieved. Otherwise, the normal download procedure is resumed. */ if (tml >= tmr && (hstat.contlen == -1 || local_size == hstat.contlen)) { logprintf (LOG_VERBOSE, _("\ Server file no newer than local file `%s' -- not retrieving.\n\n"), local_filename); free_hstat (&hstat); xfree_null (dummy); return RETROK; } else if (tml >= tmr) logprintf (LOG_VERBOSE, _("\ The sizes do not match (local %s) -- retrieving.\n"), number_to_static_string (local_size)); else logputs (LOG_VERBOSE, _("Remote file is newer, retrieving.\n")); } free_hstat (&hstat); continue; } if ((tmr != (time_t) (-1)) && !opt.spider && ((hstat.len == hstat.contlen) || ((hstat.res == 0) && ((hstat.contlen == -1) || (hstat.len >= hstat.contlen && !opt.kill_longer))))) { /* #### This code repeats in http.c and ftp.c. Move it to a function! */ const char *fl = NULL; if (opt.output_document) { if (output_stream_regular) fl = opt.output_document; } else fl = *hstat.local_file; if (fl) touch (fl, tmr); } /* End of time-stamping section. */ if (opt.spider) { logprintf (LOG_NOTQUIET, "%d %s\n\n", hstat.statcode, escnonprint (hstat.error)); xfree_null (dummy); return RETROK; } tmrate = retr_rate (hstat.rd_size, hstat.dltime); total_download_time += hstat.dltime; if (hstat.len == hstat.contlen) { if (*dt & RETROKF) { logprintf (LOG_VERBOSE, _("%s (%s) - `%s' saved [%s/%s]\n\n"), tms, tmrate, locf, number_to_static_string (hstat.len), number_to_static_string (hstat.contlen)); logprintf (LOG_NONVERBOSE, "%s URL:%s [%s/%s] -> \"%s\" [%d]\n", tms, u->url, number_to_static_string (hstat.len), number_to_static_string (hstat.contlen), locf, count); } ++opt.numurls; total_downloaded_bytes += hstat.len; /* Remember that we downloaded the file for later ".orig" code. */ if (*dt & ADDED_HTML_EXTENSION) downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf); else downloaded_file(FILE_DOWNLOADED_NORMALLY, locf); free_hstat (&hstat); xfree_null (dummy); return RETROK; } else if (hstat.res == 0) /* No read error */ { if (hstat.contlen == -1) /* We don't know how much we were supposed to get, so assume we succeeded. */ { if (*dt & RETROKF) { logprintf (LOG_VERBOSE, _("%s (%s) - `%s' saved [%s]\n\n"), tms, tmrate, locf, number_to_static_string (hstat.len)); logprintf (LOG_NONVERBOSE, "%s URL:%s [%s] -> \"%s\" [%d]\n", tms, u->url, number_to_static_string (hstat.len), locf, count); } ++opt.numurls; total_downloaded_bytes += hstat.len; /* Remember that we downloaded the file for later ".orig" code. */ if (*dt & ADDED_HTML_EXTENSION) downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf); else downloaded_file(FILE_DOWNLOADED_NORMALLY, locf); free_hstat (&hstat); xfree_null (dummy); return RETROK; } else if (hstat.len < hstat.contlen) /* meaning we lost the connection too soon */ { logprintf (LOG_VERBOSE, _("%s (%s) - Connection closed at byte %s. "), tms, tmrate, number_to_static_string (hstat.len)); printwhat (count, opt.ntry); free_hstat (&hstat); continue; } else if (!opt.kill_longer) /* meaning we got more than expected */ { logprintf (LOG_VERBOSE, _("%s (%s) - `%s' saved [%s/%s]\n\n"), tms, tmrate, locf, number_to_static_string (hstat.len), number_to_static_string (hstat.contlen)); logprintf (LOG_NONVERBOSE, "%s URL:%s [%s/%s] -> \"%s\" [%d]\n", tms, u->url, number_to_static_string (hstat.len), number_to_static_string (hstat.contlen), locf, count); ++opt.numurls; total_downloaded_bytes += hstat.len; /* Remember that we downloaded the file for later ".orig" code. */ if (*dt & ADDED_HTML_EXTENSION) downloaded_file(FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED, locf); else downloaded_file(FILE_DOWNLOADED_NORMALLY, locf); free_hstat (&hstat); xfree_null (dummy); return RETROK; } else /* the same, but not accepted */ { logprintf (LOG_VERBOSE, _("%s (%s) - Connection closed at byte %s/%s. "), tms, tmrate, number_to_static_string (hstat.len), number_to_static_string (hstat.contlen)); printwhat (count, opt.ntry); free_hstat (&hstat); continue; } } else /* now hstat.res can only be -1 */ { if (hstat.contlen == -1) { logprintf (LOG_VERBOSE, _("%s (%s) - Read error at byte %s (%s)."), tms, tmrate, number_to_static_string (hstat.len), strerror (errno)); printwhat (count, opt.ntry); free_hstat (&hstat); continue; } else /* hstat.res == -1 and contlen is given */ { logprintf (LOG_VERBOSE, _("%s (%s) - Read error at byte %s/%s (%s). "), tms, tmrate, number_to_static_string (hstat.len), number_to_static_string (hstat.contlen), strerror (errno)); printwhat (count, opt.ntry); free_hstat (&hstat); continue; } } /* not reached */ } while (!opt.ntry || (count < opt.ntry)); return TRYLIMEXC; } /* Check whether the result of strptime() indicates success. strptime() returns the pointer to how far it got to in the string. The processing has been successful if the string is at `GMT' or `+X', or at the end of the string. In extended regexp parlance, the function returns 1 if P matches "^ *(GMT|[+-][0-9]|$)", 0 otherwise. P being NULL (which strptime can return) is considered a failure and 0 is returned. */ static bool check_end (const char *p) { if (!p) return false; while (ISSPACE (*p)) ++p; if (!*p || (p[0] == 'G' && p[1] == 'M' && p[2] == 'T') || ((p[0] == '+' || p[0] == '-') && ISDIGIT (p[1]))) return true; else return false; } /* Convert the textual specification of time in TIME_STRING to the number of seconds since the Epoch. TIME_STRING can be in any of the three formats RFC2616 allows the HTTP servers to emit -- RFC1123-date, RFC850-date or asctime-date, as well as the time format used in the Set-Cookie header. Timezones are ignored, and should be GMT. Return the computed time_t representation, or -1 if the conversion fails. This function uses strptime with various string formats for parsing TIME_STRING. This results in a parser that is not as lenient in interpreting TIME_STRING as I would like it to be. Being based on strptime, it always allows shortened months, one-digit days, etc., but due to the multitude of formats in which time can be represented, an ideal HTTP time parser would be even more forgiving. It should completely ignore things like week days and concentrate only on the various forms of representing years, months, days, hours, minutes, and seconds. For example, it would be nice if it accepted ISO 8601 out of the box. I've investigated free and PD code for this purpose, but none was usable. getdate was big and unwieldy, and had potential copyright issues, or so I was informed. Dr. Marcus Hennecke's atotm(), distributed with phttpd, is excellent, but we cannot use it because it is not assigned to the FSF. So I stuck it with strptime. */ time_t http_atotm (const char *time_string) { /* NOTE: Solaris strptime man page claims that %n and %t match white space, but that's not universally available. Instead, we simply use ` ' to mean "skip all WS", which works under all strptime implementations I've tested. */ static const char *time_formats[] = { "%a, %d %b %Y %T", /* rfc1123: Thu, 29 Jan 1998 22:12:57 */ "%A, %d-%b-%y %T", /* rfc850: Thursday, 29-Jan-98 22:12:57 */ "%a %b %d %T %Y", /* asctime: Thu Jan 29 22:12:57 1998 */ "%a, %d-%b-%Y %T" /* cookies: Thu, 29-Jan-1998 22:12:57 (used in Set-Cookie, defined in the Netscape cookie specification.) */ }; const char *oldlocale; int i; time_t ret = (time_t) -1; /* Solaris strptime fails to recognize English month names in non-English locales, which we work around by temporarily setting locale to C before invoking strptime. */ oldlocale = setlocale (LC_TIME, NULL); setlocale (LC_TIME, "C"); for (i = 0; i < countof (time_formats); i++) { struct tm t; /* Some versions of strptime use the existing contents of struct tm to recalculate the date according to format. Zero it out to prevent stack garbage from influencing strptime. */ xzero (t); if (check_end (strptime (time_string, time_formats[i], &t))) { ret = timegm (&t); break; } } /* Restore the previous locale. */ setlocale (LC_TIME, oldlocale); return ret; } /* Authorization support: We support three authorization schemes: * `Basic' scheme, consisting of base64-ing USER:PASSWORD string; * `Digest' scheme, added by Junio Hamano , consisting of answering to the server's challenge with the proper MD5 digests. * `NTLM' ("NT Lan Manager") scheme, based on code written by Daniel Stenberg for libcurl. Like digest, NTLM is based on a challenge-response mechanism, but unlike digest, it is non-standard (authenticates TCP connections rather than requests), undocumented and Microsoft-specific. */ /* Create the authentication header contents for the `Basic' scheme. This is done by encoding the string "USER:PASS" to base64 and prepending the string "Basic " in front of it. */ static char * basic_authentication_encode (const char *user, const char *passwd) { char *t1, *t2; int len1 = strlen (user) + 1 + strlen (passwd); t1 = (char *)alloca (len1 + 1); sprintf (t1, "%s:%s", user, passwd); t2 = (char *)alloca (BASE64_LENGTH (len1) + 1); base64_encode (t1, len1, t2); return concat_strings ("Basic ", t2, (char *) 0); } #define SKIP_WS(x) do { \ while (ISSPACE (*(x))) \ ++(x); \ } while (0) #ifdef ENABLE_DIGEST /* Parse HTTP `WWW-Authenticate:' header. AU points to the beginning of a field in such a header. If the field is the one specified by ATTR_NAME ("realm", "opaque", and "nonce" are used by the current digest authorization code), extract its value in the (char*) variable pointed by RET. Returns negative on a malformed header, or number of bytes that have been parsed by this call. */ static int extract_header_attr (const char *au, const char *attr_name, char **ret) { const char *ep; const char *cp = au; if (strncmp (cp, attr_name, strlen (attr_name)) == 0) { cp += strlen (attr_name); if (!*cp) return -1; SKIP_WS (cp); if (*cp != '=') return -1; if (!*++cp) return -1; SKIP_WS (cp); if (*cp != '\"') return -1; if (!*++cp) return -1; for (ep = cp; *ep && *ep != '\"'; ep++) ; if (!*ep) return -1; xfree_null (*ret); *ret = strdupdelim (cp, ep); return ep - au + 1; } else return 0; } /* Dump the hexadecimal representation of HASH to BUF. HASH should be an array of 16 bytes containing the hash keys, and BUF should be a buffer of 33 writable characters (32 for hex digits plus one for zero termination). */ static void dump_hash (char *buf, const unsigned char *hash) { int i; for (i = 0; i < MD5_HASHLEN; i++, hash++) { *buf++ = XNUM_TO_digit (*hash >> 4); *buf++ = XNUM_TO_digit (*hash & 0xf); } *buf = '\0'; } /* Take the line apart to find the challenge, and compose a digest authorization header. See RFC2069 section 2.1.2. */ static char * digest_authentication_encode (const char *au, const char *user, const char *passwd, const char *method, const char *path) { static char *realm, *opaque, *nonce; static struct { const char *name; char **variable; } options[] = { { "realm", &realm }, { "opaque", &opaque }, { "nonce", &nonce } }; char *res; realm = opaque = nonce = NULL; au += 6; /* skip over `Digest' */ while (*au) { int i; SKIP_WS (au); for (i = 0; i < countof (options); i++) { int skip = extract_header_attr (au, options[i].name, options[i].variable); if (skip < 0) { xfree_null (realm); xfree_null (opaque); xfree_null (nonce); return NULL; } else if (skip) { au += skip; break; } } if (i == countof (options)) { while (*au && *au != '=') au++; if (*au && *++au) { SKIP_WS (au); if (*au == '\"') { au++; while (*au && *au != '\"') au++; if (*au) au++; } } } while (*au && *au != ',') au++; if (*au) au++; } if (!realm || !nonce || !user || !passwd || !path || !method) { xfree_null (realm); xfree_null (opaque); xfree_null (nonce); return NULL; } /* Calculate the digest value. */ { ALLOCA_MD5_CONTEXT (ctx); unsigned char hash[MD5_HASHLEN]; char a1buf[MD5_HASHLEN * 2 + 1], a2buf[MD5_HASHLEN * 2 + 1]; char response_digest[MD5_HASHLEN * 2 + 1]; /* A1BUF = H(user ":" realm ":" password) */ gen_md5_init (ctx); gen_md5_update ((unsigned char *)user, strlen (user), ctx); gen_md5_update ((unsigned char *)":", 1, ctx); gen_md5_update ((unsigned char *)realm, strlen (realm), ctx); gen_md5_update ((unsigned char *)":", 1, ctx); gen_md5_update ((unsigned char *)passwd, strlen (passwd), ctx); gen_md5_finish (ctx, hash); dump_hash (a1buf, hash); /* A2BUF = H(method ":" path) */ gen_md5_init (ctx); gen_md5_update ((unsigned char *)method, strlen (method), ctx); gen_md5_update ((unsigned char *)":", 1, ctx); gen_md5_update ((unsigned char *)path, strlen (path), ctx); gen_md5_finish (ctx, hash); dump_hash (a2buf, hash); /* RESPONSE_DIGEST = H(A1BUF ":" nonce ":" A2BUF) */ gen_md5_init (ctx); gen_md5_update ((unsigned char *)a1buf, MD5_HASHLEN * 2, ctx); gen_md5_update ((unsigned char *)":", 1, ctx); gen_md5_update ((unsigned char *)nonce, strlen (nonce), ctx); gen_md5_update ((unsigned char *)":", 1, ctx); gen_md5_update ((unsigned char *)a2buf, MD5_HASHLEN * 2, ctx); gen_md5_finish (ctx, hash); dump_hash (response_digest, hash); res = xmalloc (strlen (user) + strlen (user) + strlen (realm) + strlen (nonce) + strlen (path) + 2 * MD5_HASHLEN /*strlen (response_digest)*/ + (opaque ? strlen (opaque) : 0) + 128); sprintf (res, "Digest \ username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"", user, realm, nonce, path, response_digest); if (opaque) { char *p = res + strlen (res); strcat (p, ", opaque=\""); strcat (p, opaque); strcat (p, "\""); } } return res; } #endif /* ENABLE_DIGEST */ /* Computing the size of a string literal must take into account that value returned by sizeof includes the terminating \0. */ #define STRSIZE(literal) (sizeof (literal) - 1) /* Whether chars in [b, e) begin with the literal string provided as first argument and are followed by whitespace or terminating \0. The comparison is case-insensitive. */ #define STARTS(literal, b, e) \ ((e) - (b) >= STRSIZE (literal) \ && 0 == strncasecmp (b, literal, STRSIZE (literal)) \ && ((e) - (b) == STRSIZE (literal) \ || ISSPACE (b[STRSIZE (literal)]))) static bool known_authentication_scheme_p (const char *hdrbeg, const char *hdrend) { return STARTS ("Basic", hdrbeg, hdrend) #ifdef ENABLE_DIGEST || STARTS ("Digest", hdrbeg, hdrend) #endif #ifdef ENABLE_NTLM || STARTS ("NTLM", hdrbeg, hdrend) #endif ; } #undef STARTS /* Create the HTTP authorization request header. When the `WWW-Authenticate' response header is seen, according to the authorization scheme specified in that header (`Basic' and `Digest' are supported by the current implementation), produce an appropriate HTTP authorization request header. */ static char * create_authorization_line (const char *au, const char *user, const char *passwd, const char *method, const char *path, bool *finished) { /* We are called only with known schemes, so we can dispatch on the first letter. */ switch (TOUPPER (*au)) { case 'B': /* Basic */ *finished = true; return basic_authentication_encode (user, passwd); #ifdef ENABLE_DIGEST case 'D': /* Digest */ *finished = true; return digest_authentication_encode (au, user, passwd, method, path); #endif #ifdef ENABLE_NTLM case 'N': /* NTLM */ if (!ntlm_input (&pconn.ntlm, au)) { *finished = true; return NULL; } return ntlm_output (&pconn.ntlm, user, passwd, finished); #endif default: /* We shouldn't get here -- this function should be only called with values approved by known_authentication_scheme_p. */ abort (); } } void save_cookies (void) { if (wget_cookie_jar) cookie_jar_save (wget_cookie_jar, opt.cookies_output); } void http_cleanup (void) { xfree_null (pconn.host); if (wget_cookie_jar) cookie_jar_delete (wget_cookie_jar); }