/* Parsing FTP `ls' output. Copyright (C) 1995, 1996, 1997, 2000, 2001 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #ifdef HAVE_STRING_H # include #else # include #endif #ifdef HAVE_UNISTD_H # include #endif #include #include #include "wget.h" #include "utils.h" #include "ftp.h" #include "url.h" /* Converts symbolic permissions to number-style ones, e.g. string rwxr-xr-x to 755. For now, it knows nothing of setuid/setgid/sticky. ACLs are ignored. */ static int symperms (const char *s) { int perms = 0, i; if (strlen (s) < 9) return 0; for (i = 0; i < 3; i++, s += 3) { perms <<= 3; perms += (((s[0] == 'r') << 2) + ((s[1] == 'w') << 1) + (s[2] == 'x' || s[2] == 's')); } return perms; } /* Cleans a line of text so that it can be consistently parsed. Destroys and in case that thay occur at the end of the line and replaces all character with . Returns the length of the modified line. */ static int clean_line(char *line) { int len = strlen (line); if (!len) return 0; if (line[len - 1] == '\n') line[--len] = '\0'; if (line[len - 1] == '\r') line[--len] = '\0'; for ( ; *line ; line++ ) if (*line == '\t') *line = ' '; return len; } /* Convert the Un*x-ish style directory listing stored in FILE to a linked list of fileinfo (system-independent) entries. The contents of FILE are considered to be produced by the standard Unix `ls -la' output (whatever that might be). BSD (no group) and SYSV (with group) listings are handled. The time stamps are stored in a separate variable, time_t compatible (I hope). The timezones are ignored. */ static struct fileinfo * ftp_parse_unix_ls (const char *file, int ignore_perms) { FILE *fp; static const char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; int next, len, i, error, ignore; int year, month, day; /* for time analysis */ int hour, min, sec; struct tm timestruct, *tnow; time_t timenow; char *line, *tok; /* tokenizer */ struct fileinfo *dir, *l, cur; /* list creation */ fp = fopen (file, "rb"); if (!fp) { logprintf (LOG_NOTQUIET, "%s: %s\n", file, strerror (errno)); return NULL; } dir = l = NULL; /* Line loop to end of file: */ while ((line = read_whole_line (fp))) { len = clean_line (line); /* Skip if total... */ if (!strncasecmp (line, "total", 5)) { xfree (line); continue; } /* Get the first token (permissions). */ tok = strtok (line, " "); if (!tok) { xfree (line); continue; } cur.name = NULL; cur.linkto = NULL; /* Decide whether we deal with a file or a directory. */ switch (*tok) { case '-': cur.type = FT_PLAINFILE; DEBUGP (("PLAINFILE; ")); break; case 'd': cur.type = FT_DIRECTORY; DEBUGP (("DIRECTORY; ")); break; case 'l': cur.type = FT_SYMLINK; DEBUGP (("SYMLINK; ")); break; default: cur.type = FT_UNKNOWN; DEBUGP (("UNKNOWN; ")); break; } if (ignore_perms) { switch (cur.type) { case FT_PLAINFILE: cur.perms = 0644; break; case FT_DIRECTORY: cur.perms = 0755; break; default: /*cur.perms = 1023;*/ /* #### What is this? --hniksic */ cur.perms = 0644; } DEBUGP (("implicit perms %0o; ", cur.perms)); } else { cur.perms = symperms (tok + 1); DEBUGP (("perms %0o; ", cur.perms)); } error = ignore = 0; /* Erroneous and ignoring entries are treated equally for now. */ year = hour = min = sec = 0; /* Silence the compiler. */ month = day = 0; next = -1; /* While there are tokens on the line, parse them. Next is the number of tokens left until the filename. Use the month-name token as the "anchor" (the place where the position wrt the file name is "known"). When a month name is encountered, `next' is set to 5. Also, the preceding characters are parsed to get the file size. This tactic is quite dubious when it comes to internationalization issues (non-English month names), but it works for now. */ while ((tok = strtok (NULL, " "))) { --next; if (next < 0) /* a month name was not encountered */ { for (i = 0; i < 12; i++) if (!strcmp (tok, months[i])) break; /* If we got a month, it means the token before it is the size, and the filename is three tokens away. */ if (i != 12) { char *t = tok - 2; long mul = 1; for (cur.size = 0; t > line && ISDIGIT (*t); mul *= 10, t--) cur.size += mul * (*t - '0'); if (t == line) { /* Something is seriously wrong. */ error = 1; break; } month = i; next = 5; DEBUGP (("month: %s; ", months[month])); } } else if (next == 4) /* days */ { if (tok[1]) /* two-digit... */ day = 10 * (*tok - '0') + tok[1] - '0'; else /* ...or one-digit */ day = *tok - '0'; DEBUGP (("day: %d; ", day)); } else if (next == 3) { /* This ought to be either the time, or the year. Let's be flexible! If we have a number x, it's a year. If we have x:y, it's hours and minutes. If we have x:y:z, z are seconds. */ year = 0; min = hour = sec = 0; /* We must deal with digits. */ if (ISDIGIT (*tok)) { /* Suppose it's year. */ for (; ISDIGIT (*tok); tok++) year = (*tok - '0') + 10 * year; if (*tok == ':') { /* This means these were hours! */ hour = year; year = 0; ++tok; /* Get the minutes... */ for (; ISDIGIT (*tok); tok++) min = (*tok - '0') + 10 * min; if (*tok == ':') { /* ...and the seconds. */ ++tok; for (; ISDIGIT (*tok); tok++) sec = (*tok - '0') + 10 * sec; } } } if (year) DEBUGP (("year: %d (no tm); ", year)); else DEBUGP (("time: %02d:%02d:%02d (no yr); ", hour, min, sec)); } else if (next == 2) /* The file name */ { int fnlen; char *p; /* Since the file name may contain a SPC, it is possible for strtok to handle it wrong. */ fnlen = strlen (tok); if (fnlen < len - (tok - line)) { /* So we have a SPC in the file name. Restore the original. */ tok[fnlen] = ' '; /* If the file is a symbolic link, it should have a ` -> ' somewhere. */ if (cur.type == FT_SYMLINK) { p = strstr (tok, " -> "); if (!p) { error = 1; break; } cur.linkto = xstrdup (p + 4); DEBUGP (("link to: %s\n", cur.linkto)); /* And separate it from the file name. */ *p = '\0'; } } /* If we have the filename, add it to the list of files or directories. */ /* "." and ".." are an exception! */ if (!strcmp (tok, ".") || !strcmp (tok, "..")) { DEBUGP (("\nIgnoring `.' and `..'; ")); ignore = 1; break; } /* Some FTP sites choose to have ls -F as their default LIST output, which marks the symlinks with a trailing `@', directory names with a trailing `/' and executables with a trailing `*'. This is no problem unless encountering a symbolic link ending with `@', or an executable ending with `*' on a server without default -F output. I believe these cases are very rare. */ fnlen = strlen (tok); /* re-calculate `fnlen' */ cur.name = (char *)xmalloc (fnlen + 1); memcpy (cur.name, tok, fnlen + 1); if (fnlen) { if (cur.type == FT_DIRECTORY && cur.name[fnlen - 1] == '/') { cur.name[fnlen - 1] = '\0'; DEBUGP (("trailing `/' on dir.\n")); } else if (cur.type == FT_SYMLINK && cur.name[fnlen - 1] == '@') { cur.name[fnlen - 1] = '\0'; DEBUGP (("trailing `@' on link.\n")); } else if (cur.type == FT_PLAINFILE && (cur.perms & 0111) && cur.name[fnlen - 1] == '*') { cur.name[fnlen - 1] = '\0'; DEBUGP (("trailing `*' on exec.\n")); } } /* if (fnlen) */ else error = 1; break; } else abort (); } /* while */ if (!cur.name || (cur.type == FT_SYMLINK && !cur.linkto)) error = 1; DEBUGP (("\n")); if (error || ignore) { DEBUGP (("Skipping.\n")); FREE_MAYBE (cur.name); FREE_MAYBE (cur.linkto); xfree (line); continue; } if (!dir) { l = dir = (struct fileinfo *)xmalloc (sizeof (struct fileinfo)); memcpy (l, &cur, sizeof (cur)); l->prev = l->next = NULL; } else { cur.prev = l; l->next = (struct fileinfo *)xmalloc (sizeof (struct fileinfo)); l = l->next; memcpy (l, &cur, sizeof (cur)); l->next = NULL; } /* Get the current time. */ timenow = time (NULL); tnow = localtime (&timenow); /* Build the time-stamp (the idea by zaga@fly.cc.fer.hr). */ timestruct.tm_sec = sec; timestruct.tm_min = min; timestruct.tm_hour = hour; timestruct.tm_mday = day; timestruct.tm_mon = month; if (year == 0) { /* Some listings will not specify the year if it is "obvious" that the file was from the previous year. E.g. if today is 97-01-12, and you see a file of Dec 15th, its year is 1996, not 1997. Thanks to Vladimir Volovich for mentioning this! */ if (month > tnow->tm_mon) timestruct.tm_year = tnow->tm_year - 1; else timestruct.tm_year = tnow->tm_year; } else timestruct.tm_year = year; if (timestruct.tm_year >= 1900) timestruct.tm_year -= 1900; timestruct.tm_wday = 0; timestruct.tm_yday = 0; timestruct.tm_isdst = -1; l->tstamp = mktime (×truct); /* store the time-stamp */ xfree (line); } fclose (fp); return dir; } static struct fileinfo * ftp_parse_winnt_ls (const char *file) { FILE *fp; int len; int year, month, day; /* for time analysis */ int hour, min; struct tm timestruct; char *line, *tok; /* tokenizer */ struct fileinfo *dir, *l, cur; /* list creation */ fp = fopen (file, "rb"); if (!fp) { logprintf (LOG_NOTQUIET, "%s: %s\n", file, strerror (errno)); return NULL; } dir = l = NULL; /* Line loop to end of file: */ while ((line = read_whole_line (fp))) { len = clean_line (line); /* Extracting name is a bit of black magic and we have to do it before `strtok' inserted extra \0 characters in the line string. For the moment let us just suppose that the name starts at column 39 of the listing. This way we could also recognize filenames that begin with a series of space characters (but who really wants to use such filenames anyway?). */ if (len < 40) continue; tok = line + 39; cur.name = xstrdup(tok); DEBUGP(("Name: '%s'\n", cur.name)); /* First column: mm-dd-yy. Should atoi() on the month fail, january will be assumed. */ tok = strtok(line, "-"); month = atoi(tok) - 1; if (month < 0) month = 0; tok = strtok(NULL, "-"); day = atoi(tok); tok = strtok(NULL, " "); year = atoi(tok); /* Assuming the epoch starting at 1.1.1970 */ if (year <= 70) year += 100; /* Second column: hh:mm[AP]M, listing does not contain value for seconds */ tok = strtok(NULL, ":"); hour = atoi(tok); tok = strtok(NULL, "M"); min = atoi(tok); /* Adjust hour from AM/PM. Just for the record, the sequence goes 11:00AM, 12:00PM, 01:00PM ... 11:00PM, 12:00AM, 01:00AM . */ tok+=2; if (hour == 12) hour = 0; if (*tok == 'P') hour += 12; DEBUGP(("YYYY/MM/DD HH:MM - %d/%02d/%02d %02d:%02d\n", year+1900, month, day, hour, min)); /* Build the time-stamp (copy & paste from above) */ timestruct.tm_sec = 0; timestruct.tm_min = min; timestruct.tm_hour = hour; timestruct.tm_mday = day; timestruct.tm_mon = month; timestruct.tm_year = year; timestruct.tm_wday = 0; timestruct.tm_yday = 0; timestruct.tm_isdst = -1; cur.tstamp = mktime (×truct); /* store the time-stamp */ DEBUGP(("Timestamp: %ld\n", cur.tstamp)); /* Third column: Either file length, or . We also set the permissions (guessed as 0644 for plain files and 0755 for directories as the listing does not give us a clue) and filetype here. */ tok = strtok(NULL, " "); while (*tok == '\0') tok = strtok(NULL, " "); if (*tok == '<') { cur.type = FT_DIRECTORY; cur.size = 0; cur.perms = 0755; DEBUGP(("Directory\n")); } else { cur.type = FT_PLAINFILE; cur.size = atoi(tok); cur.perms = 0644; DEBUGP(("File, size %ld bytes\n", cur.size)); } cur.linkto = NULL; /* And put everything into the linked list */ if (!dir) { l = dir = (struct fileinfo *)xmalloc (sizeof (struct fileinfo)); memcpy (l, &cur, sizeof (cur)); l->prev = l->next = NULL; } else { cur.prev = l; l->next = (struct fileinfo *)xmalloc (sizeof (struct fileinfo)); l = l->next; memcpy (l, &cur, sizeof (cur)); l->next = NULL; } xfree(line); } fclose(fp); return dir; } /* Converts VMS symbolic permissions to number-style ones, e.g. string RWED,RWE,RE to 755. "D" (delete) is taken to be equal to "W" (write). Inspired by a patch of Stoyan Lekov . */ static int vmsperms (const char *s) { int perms = 0; do { switch (*s) { case ',': perms <<= 3; break; case 'R': perms |= 4; break; case 'W': perms |= 2; break; case 'D': perms |= 2; break; case 'E': perms |= 1; break; default: DEBUGP(("wrong VMS permissons!\n")); } } while (*++s); return perms; } static struct fileinfo * ftp_parse_vms_ls (const char *file) { FILE *fp; /* #### A third copy of more-or-less the same array ? */ static const char *months[] = { "JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG", "SEP", "OCT", "NOV", "DEC" }; int i; int year, month, day; /* for time analysis */ int hour, min, sec; struct tm timestruct; char *line, *tok; /* tokenizer */ struct fileinfo *dir, *l, cur; /* list creation */ fp = fopen (file, "rb"); if (!fp) { logprintf (LOG_NOTQUIET, "%s: %s\n", file, strerror (errno)); return NULL; } dir = l = NULL; /* Empty line */ read_whole_line (fp); /* "Directory PUB$DEVICE[PUB]" */ read_whole_line (fp); /* Empty line */ read_whole_line (fp); /* Line loop to end of file: */ while ((line = read_whole_line (fp))) { char *p; i = clean_line (line); if (!i) break; /* First column: Name. A bit of black magic again. The name my be either ABCD.EXT or ABCD.EXT;NUM and it might be on a separate line. Therefore we will first try to get the complete name until the first space character; if it fails, we assume that the name occupies the whole line. After that we search for the version separator ";", we remove it and check the extension of the file; extension .DIR denotes directory. */ tok = strtok(line, " "); if (tok == NULL) tok = line; DEBUGP(("file name: '%s'\n", tok)); for (p = tok ; *p && *p != ';' ; p++); if (*p == ';') *p = '\0'; p = tok + strlen(tok) - 4; if (!strcmp(p, ".DIR")) *p = '\0'; cur.name = xstrdup(tok); DEBUGP(("Name: '%s'\n", cur.name)); /* If the name ends on .DIR or .DIR;#, it's a directory. We also set the file size to zero as the listing does tell us only the size in filesystem blocks - for an integrity check (when mirroring, for example) we would need the size in bytes. */ if (! *p) { cur.type = FT_DIRECTORY; cur.size = 0; DEBUGP(("Directory\n")); } else { cur.type = FT_PLAINFILE; DEBUGP(("File\n")); } cur.size = 0; /* Second column, if exists, or the first column of the next line contain file size in blocks. We will skip it. */ tok = strtok(NULL, " "); if (tok == NULL) { DEBUGP(("Getting additional line\n")); xfree (line); line = read_whole_line (fp); if (!line) { DEBUGP(("empty line read, leaving listing parser\n")); break; } i = clean_line (line); if (!i) { DEBUGP(("confusing VMS listing item, leaving listing parser\n")); break; } tok = strtok(line, " "); } DEBUGP(("second token: '%s'\n", tok)); /* Third/Second column: Date DD-MMM-YYYY. */ tok = strtok(NULL, "-"); DEBUGP(("day: '%s'\n",tok)); day = atoi(tok); tok = strtok(NULL, "-"); if (!tok) { /* If the server produces garbage like 'EA95_0PS.GZ;1 No privilege for attempted operation' the first strtok(NULL, "-") will return everything until the end of the line and only the next strtok() call will return NULL. */ DEBUGP(("nonsense in VMS listing, skipping this line\n")); break; } for (i=0; i<12; i++) if (!strcmp(tok,months[i])) break; /* Uknown months are mapped to January */ month = i % 12 ; tok = strtok (NULL, " "); year = atoi (tok) - 1900; DEBUGP(("date parsed\n")); /* Fourth/Third column: Time hh:mm[:ss] */ tok = strtok (NULL, " "); hour = min = sec = 0; p = tok; hour = atoi (p); for (; *p && *p != ':'; ++p); if (*p) min = atoi (++p); for (; *p && *p != ':'; ++p); if (*p) sec = atoi (++p); DEBUGP(("YYYY/MM/DD HH:MM:SS - %d/%02d/%02d %02d:%02d:%02d\n", year+1900, month, day, hour, min, sec)); /* Build the time-stamp (copy & paste from above) */ timestruct.tm_sec = sec; timestruct.tm_min = min; timestruct.tm_hour = hour; timestruct.tm_mday = day; timestruct.tm_mon = month; timestruct.tm_year = year; timestruct.tm_wday = 0; timestruct.tm_yday = 0; timestruct.tm_isdst = -1; cur.tstamp = mktime (×truct); /* store the time-stamp */ DEBUGP(("Timestamp: %ld\n", cur.tstamp)); /* Skip the fifth column */ tok = strtok(NULL, " "); /* Sixth column: Permissions */ tok = strtok(NULL, ","); /* Skip the VMS-specific SYSTEM permissons */ tok = strtok(NULL, ")"); if (tok == NULL) { DEBUGP(("confusing VMS permissions, skipping line\n")); continue; } /* Permissons have the format "RWED,RWED,RE" */ cur.perms = vmsperms(tok); DEBUGP(("permissions: %s -> 0%o\n", tok, cur.perms)); cur.linkto = NULL; /* And put everything into the linked list */ if (!dir) { l = dir = (struct fileinfo *)xmalloc (sizeof (struct fileinfo)); memcpy (l, &cur, sizeof (cur)); l->prev = l->next = NULL; } else { cur.prev = l; l->next = (struct fileinfo *)xmalloc (sizeof (struct fileinfo)); l = l->next; memcpy (l, &cur, sizeof (cur)); l->next = NULL; } xfree (line); } fclose (fp); return dir; } /* This function switches between the correct parsing routine depending on the SYSTEM_TYPE. The system type should be based on the result of the "SYST" response of the FTP server. According to this repsonse we will use on of the three different listing parsers that cover the most of FTP servers used nowadays. */ struct fileinfo * ftp_parse_ls (const char *file, const enum stype system_type) { switch (system_type) { case ST_UNIX: return ftp_parse_unix_ls (file, FALSE); case ST_WINNT: { /* Detect whether the listing is simulating the UNIX format */ FILE *fp; int c; fp = fopen (file, "rb"); if (!fp) { logprintf (LOG_NOTQUIET, "%s: %s\n", file, strerror (errno)); return NULL; } c = fgetc(fp); fclose(fp); /* If the first character of the file is '0'-'9', it's WINNT format. */ if (c >= '0' && c <='9') return ftp_parse_winnt_ls (file); else return ftp_parse_unix_ls (file, TRUE); } case ST_VMS: return ftp_parse_vms_ls (file); case ST_MACOS: return ftp_parse_unix_ls (file, TRUE); default: logprintf (LOG_NOTQUIET, _("\ Unsupported listing type, trying Unix listing parser.\n")); return ftp_parse_unix_ls (file, FALSE); } } /* Stuff for creating FTP index. */ /* The function creates an HTML index containing references to given directories and files on the appropriate host. The references are FTP. */ uerr_t ftp_index (const char *file, struct url *u, struct fileinfo *f) { FILE *fp; char *upwd; char *htclfile; /* HTML-clean file name */ if (!opt.dfp) { fp = fopen (file, "wb"); if (!fp) { logprintf (LOG_NOTQUIET, "%s: %s\n", file, strerror (errno)); return FOPENERR; } } else fp = opt.dfp; if (u->user) { char *tmpu, *tmpp; /* temporary, clean user and passwd */ tmpu = encode_string (u->user); tmpp = u->passwd ? encode_string (u->passwd) : NULL; upwd = (char *)xmalloc (strlen (tmpu) + (tmpp ? (1 + strlen (tmpp)) : 0) + 2); sprintf (upwd, "%s%s%s@", tmpu, tmpp ? ":" : "", tmpp ? tmpp : ""); xfree (tmpu); FREE_MAYBE (tmpp); } else upwd = xstrdup (""); fprintf (fp, "\n"); fprintf (fp, "\n\n"); fprintf (fp, _("Index of /%s on %s:%d"), u->dir, u->host, u->port); fprintf (fp, "\n\n\n

"); fprintf (fp, _("Index of /%s on %s:%d"), u->dir, u->host, u->port); fprintf (fp, "

\n
\n
\n");
  while (f)
    {
      fprintf (fp, "  ");
      if (f->tstamp != -1)
	{
	  /* #### Should we translate the months? */
	  static char *months[] = {
	    "Jan", "Feb", "Mar", "Apr", "May", "Jun",
	    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
	  };
	  struct tm *ptm = localtime ((time_t *)&f->tstamp);

	  fprintf (fp, "%d %s %02d ", ptm->tm_year + 1900, months[ptm->tm_mon],
		  ptm->tm_mday);
	  if (ptm->tm_hour)
	    fprintf (fp, "%02d:%02d  ", ptm->tm_hour, ptm->tm_min);
	  else
	    fprintf (fp, "       ");
	}
      else
	fprintf (fp, _("time unknown       "));
      switch (f->type)
	{
	case FT_PLAINFILE:
	  fprintf (fp, _("File        "));
	  break;
	case FT_DIRECTORY:
	  fprintf (fp, _("Directory   "));
	  break;
	case FT_SYMLINK:
	  fprintf (fp, _("Link        "));
	  break;
	default:
	  fprintf (fp, _("Not sure    "));
	  break;
	}
      htclfile = html_quote_string (f->name);
      fprintf (fp, "host, u->port);
      if (*u->dir != '/')
	putc ('/', fp);
      fprintf (fp, "%s", u->dir);
      if (*u->dir)
	putc ('/', fp);
      fprintf (fp, "%s", htclfile);
      if (f->type == FT_DIRECTORY)
	putc ('/', fp);
      fprintf (fp, "\">%s", htclfile);
      if (f->type == FT_DIRECTORY)
	putc ('/', fp);
      fprintf (fp, " ");
      if (f->type == FT_PLAINFILE)
	fprintf (fp, _(" (%s bytes)"), legible (f->size));
      else if (f->type == FT_SYMLINK)
	fprintf (fp, "-> %s", f->linkto ? f->linkto : "(nil)");
      putc ('\n', fp);
      xfree (htclfile);
      f = f->next;
    }
  fprintf (fp, "
\n\n\n"); xfree (upwd); if (!opt.dfp) fclose (fp); else fflush (fp); return FTPOK; }