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Code Issues Releases Wiki Activity
9655474548
curl/lib/dict.c
Daniel Stenberg 0c55fbab45
conn: add 'attach' to protocol handler, make libssh2 use it 
The libssh2 backend has SSH session associated with the connection but
the callback context is the easy handle, so when a connection gets
attached to a transfer, the protocol handler now allows for a custom
function to get used to set things up correctly.

Reported-by: Michael O'Farrell
Fixes #6898
Closes #7078
2021-05-17 17:57:50 +02:00

325 lines
8.6 KiB
C
Raw Blame History

/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "curl_setup.h"
#ifndef CURL_DISABLE_DICT
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_NET_IF_H
#include <net/if.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#elif defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif
#include "urldata.h"
#include <curl/curl.h>
#include "transfer.h"
#include "sendf.h"
#include "escape.h"
#include "progress.h"
#include "dict.h"
#include "curl_printf.h"
#include "strcase.h"
#include "curl_memory.h"
/* The last #include file should be: */
#include "memdebug.h"
/*
* Forward declarations.
*/
static CURLcode dict_do(struct Curl_easy *data, bool *done);
/*
* DICT protocol handler.
*/
const struct Curl_handler Curl_handler_dict = {
"DICT", /* scheme */
ZERO_NULL, /* setup_connection */
dict_do, /* do_it */
ZERO_NULL, /* done */
ZERO_NULL, /* do_more */
ZERO_NULL, /* connect_it */
ZERO_NULL, /* connecting */
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */
ZERO_NULL, /* connection_check */
ZERO_NULL, /* attach connection */
PORT_DICT, /* defport */
CURLPROTO_DICT, /* protocol */
CURLPROTO_DICT, /* family */
PROTOPT_NONE | PROTOPT_NOURLQUERY /* flags */
};
static char *unescape_word(struct Curl_easy *data, const char *inputbuff)
{
char *newp = NULL;
char *dictp;
size_t len;
CURLcode result = Curl_urldecode(data, inputbuff, 0, &newp, &len,
REJECT_NADA);
if(!newp || result)
return NULL;
dictp = malloc(len*2 + 1); /* add one for terminating zero */
if(dictp) {
char *ptr;
char ch;
int olen = 0;
/* According to RFC2229 section 2.2, these letters need to be escaped with
\[letter] */
for(ptr = newp;
(ch = *ptr) != 0;
ptr++) {
if((ch <= 32) || (ch == 127) ||
(ch == '\'') || (ch == '\"') || (ch == '\\')) {
dictp[olen++] = '\\';
}
dictp[olen++] = ch;
}
dictp[olen] = 0;
}
free(newp);
return dictp;
}
/* sendf() sends formatted data to the server */
static CURLcode sendf(curl_socket_t sockfd, struct Curl_easy *data,
const char *fmt, ...)
{
ssize_t bytes_written;
size_t write_len;
CURLcode result = CURLE_OK;
char *s;
char *sptr;
va_list ap;
va_start(ap, fmt);
s = vaprintf(fmt, ap); /* returns an allocated string */
va_end(ap);
if(!s)
return CURLE_OUT_OF_MEMORY; /* failure */
bytes_written = 0;
write_len = strlen(s);
sptr = s;
for(;;) {
/* Write the buffer to the socket */
result = Curl_write(data, sockfd, sptr, write_len, &bytes_written);
if(result)
break;
Curl_debug(data, CURLINFO_DATA_OUT, sptr, (size_t)bytes_written);
if((size_t)bytes_written != write_len) {
/* if not all was written at once, we must advance the pointer, decrease
the size left and try again! */
write_len -= bytes_written;
sptr += bytes_written;
}
else
break;
}
free(s); /* free the output string */
return result;
}
static CURLcode dict_do(struct Curl_easy *data, bool *done)
{
char *word;
char *eword;
char *ppath;
char *database = NULL;
char *strategy = NULL;
char *nthdef = NULL; /* This is not part of the protocol, but required
by RFC 2229 */
CURLcode result = CURLE_OK;
struct connectdata *conn = data->conn;
curl_socket_t sockfd = conn->sock[FIRSTSOCKET];
char *path = data->state.up.path;
*done = TRUE; /* unconditionally */
if(conn->bits.user_passwd) {
/* AUTH is missing */
}
if(strncasecompare(path, DICT_MATCH, sizeof(DICT_MATCH)-1) ||
strncasecompare(path, DICT_MATCH2, sizeof(DICT_MATCH2)-1) ||
strncasecompare(path, DICT_MATCH3, sizeof(DICT_MATCH3)-1)) {
word = strchr(path, ':');
if(word) {
word++;
database = strchr(word, ':');
if(database) {
*database++ = (char)0;
strategy = strchr(database, ':');
if(strategy) {
*strategy++ = (char)0;
nthdef = strchr(strategy, ':');
if(nthdef) {
*nthdef = (char)0;
}
}
}
}
if(!word || (*word == (char)0)) {
infof(data, "lookup word is missing\n");
word = (char *)"default";
}
if(!database || (*database == (char)0)) {
database = (char *)"!";
}
if(!strategy || (*strategy == (char)0)) {
strategy = (char *)".";
}
eword = unescape_word(data, word);
if(!eword)
return CURLE_OUT_OF_MEMORY;
result = sendf(sockfd, data,
"CLIENT " LIBCURL_NAME " " LIBCURL_VERSION "\r\n"
"MATCH "
"%s " /* database */
"%s " /* strategy */
"%s\r\n" /* word */
"QUIT\r\n",
database,
strategy,
eword);
free(eword);
if(result) {
failf(data, "Failed sending DICT request");
return result;
}
Curl_setup_transfer(data, FIRSTSOCKET, -1, FALSE, -1); /* no upload */
}
else if(strncasecompare(path, DICT_DEFINE, sizeof(DICT_DEFINE)-1) ||
strncasecompare(path, DICT_DEFINE2, sizeof(DICT_DEFINE2)-1) ||
strncasecompare(path, DICT_DEFINE3, sizeof(DICT_DEFINE3)-1)) {
word = strchr(path, ':');
if(word) {
word++;
database = strchr(word, ':');
if(database) {
*database++ = (char)0;
nthdef = strchr(database, ':');
if(nthdef) {
*nthdef = (char)0;
}
}
}
if(!word || (*word == (char)0)) {
infof(data, "lookup word is missing\n");
word = (char *)"default";
}
if(!database || (*database == (char)0)) {
database = (char *)"!";
}
eword = unescape_word(data, word);
if(!eword)
return CURLE_OUT_OF_MEMORY;
result = sendf(sockfd, data,
"CLIENT " LIBCURL_NAME " " LIBCURL_VERSION "\r\n"
"DEFINE "
"%s " /* database */
"%s\r\n" /* word */
"QUIT\r\n",
database,
eword);
free(eword);
if(result) {
failf(data, "Failed sending DICT request");
return result;
}
Curl_setup_transfer(data, FIRSTSOCKET, -1, FALSE, -1);
}
else {
ppath = strchr(path, '/');
if(ppath) {
int i;
ppath++;
for(i = 0; ppath[i]; i++) {
if(ppath[i] == ':')
ppath[i] = ' ';
}
result = sendf(sockfd, data,
"CLIENT " LIBCURL_NAME " " LIBCURL_VERSION "\r\n"
"%s\r\n"
"QUIT\r\n", ppath);
if(result) {
failf(data, "Failed sending DICT request");
return result;
}
Curl_setup_transfer(data, FIRSTSOCKET, -1, FALSE, -1);
}
}
return CURLE_OK;
}
#endif /*CURL_DISABLE_DICT*/
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