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netrc.c

/* netrc.c -- parse the .netrc file to get hosts, accounts, and passwords

   Gordon Matzigkeit <gord@gnu.ai.mit.edu>, 1996

   This program 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.
  
   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

   For license terms, see the file COPYING in this directory.

   Compile with -DSTANDALONE to test this module. */

#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>

#include <config.h>
#include "netrc.h"

/* Normally defined in xstrdup.c. */
# define xstrdup strdup

/* Normally defined in xmalloc.c */
# define xmalloc malloc
# define xrealloc realloc

#define POPBUFSIZE BUFSIZ

/* Maybe add NEWENTRY to the account information list, LIST.  NEWENTRY is
   set to a ready-to-use netrc_entry, in any event. */
static void
maybe_add_to_list (netrc_entry **newentry, netrc_entry **list)
{
    netrc_entry *a, *l;
    a = *newentry;
    l = *list;

    /* We need an account name in order to add the entry to the list. */
    if (a && ! a->account)
    {
      /* Free any allocated space. */
      if (a->host)
          free (a->host);
      if (a->password)
          free (a->password);
    }
    else
    {
      if (a)
      {
          /* Add the current machine into our list. */
          a->next = l;
          l = a;
      }

      /* Allocate a new netrc_entry structure. */
      a = (netrc_entry *) xmalloc (sizeof (netrc_entry));
    }

    /* Zero the structure, so that it is ready to use. */
    memset (a, 0, sizeof(*a));

    /* Return the new pointers. */
    *newentry = a;
    *list = l;
    return;
}


/* Parse FILE as a .netrc file (as described in ftp(1)), and return a
   list of entries.  NULL is returned if the file could not be
   parsed. */
netrc_entry *
parse_netrc (file)
     char *file;
{
    FILE *fp;
    char buf[POPBUFSIZE+1], *p, *tok;
    const char *premature_token;
    netrc_entry *current, *retval;
    int ln;

    /* The latest token we've seen in the file. */
    enum
    {
      tok_nothing, tok_account, tok_login, tok_macdef, tok_machine, tok_password
    } last_token = tok_nothing;

    current = retval = NULL;

    fp = fopen (file, "r");
    if (!fp)
    {
      /* Just return NULL if we can't open the file. */
      return NULL;
    }

    /* Initialize the file data. */
    ln = 0;
    premature_token = NULL;

    /* While there are lines in the file... */
    while (fgets(buf, POPBUFSIZE, fp))
    {
      ln++;

      /* Strip trailing CRLF */
      for (p = buf + strlen(buf) - 1; (p >= buf) && isspace((unsigned)*p); p--)
          *p = '\0';

      /* Parse the line. */
      p = buf;

      /* If the line is empty... */
      if (!*p) {
          if (last_token == tok_macdef) { /* end of macro */
            last_token = tok_nothing;
          } else {
            continue;               /* otherwise ignore it */
          }
      }

      /* If we are defining macros, then skip parsing the line. */
      while (*p && last_token != tok_macdef)
      {
          char quote_char = 0;
          char *pp;

          /* Skip any whitespace. */
          while (*p && isspace ((unsigned)*p))
            p++;

          /* Discard end-of-line comments. */
          if (*p == '#')
            break;

          tok = pp = p;

          /* Find the end of the token. */
          while (*p && (quote_char || !isspace ((unsigned)*p)))
          {
            if (quote_char)
            {
                if (quote_char == *p)
                {
                  quote_char = 0;
                  p ++;
                }
                else
                {
                  *pp = *p;
                  p ++;
                  pp ++;
                }
            }
            else
            {
                if (*p == '"' || *p == '\'')
                  quote_char = *p;
                else
                {
                  *pp = *p;
                  pp ++;
                }
                p ++;
            }
          }
          /* Null-terminate the token, if it isn't already. */
          if (*p)
            *p ++ = '\0';
          *pp = 0;

          switch (last_token)
          {
          case tok_login:
            if (current)
                current->account = (char *) xstrdup (tok);
            else
                premature_token = "login";
            break;

          case tok_machine:
            /* Start a new machine entry. */
            maybe_add_to_list (&current, &retval);
            current->host = (char *) xstrdup (tok);
            break;

          case tok_password:
            if (current)
                current->password = (char *) xstrdup (tok);
            else
                premature_token = "password";
            break;

            /* We handle most of tok_macdef above. */
          case tok_macdef:
            if (!current)
                premature_token = "macdef";
            break;

            /* We don't handle the account keyword at all. */
          case tok_account:
            if (!current)
                premature_token = "account";
            break;

            /* We handle tok_nothing below this switch. */
          case tok_nothing:
            break;
          }

          if (premature_token)
          {
#ifdef HAVE_ERROR
            error_at_line (0, file, ln,
                         "warning: found \"%s\" before any host names",
                         premature_token);
#else
            fprintf (stderr,
                   "%s:%d: warning: found \"%s\" before any host names\n",
                   file, ln, premature_token);
#endif
            premature_token = NULL;
          }

          if (last_token != tok_nothing)
            /* We got a value, so reset the token state. */
            last_token = tok_nothing;
          else
          {
            /* Fetch the next token. */
            if (!strcmp (tok, "default"))
            {
                maybe_add_to_list (&current, &retval);
            }
            else if (!strcmp (tok, "login"))
                last_token = tok_login;

            else if (!strcmp (tok, "user"))
                last_token = tok_login;

            else if (!strcmp (tok, "macdef"))
                last_token = tok_macdef;

            else if (!strcmp (tok, "machine"))
                last_token = tok_machine;

            else if (!strcmp (tok, "password"))
                last_token = tok_password;

            else if (!strcmp (tok, "passwd"))
                last_token = tok_password;

            else if (!strcmp (tok, "account"))
                last_token = tok_account;

            else
            {
                fprintf (stderr, "%s:%d: warning: unknown token \"%s\"\n",
                       file, ln, tok);
            }
          }
      }
    }

    fclose (fp);

    /* Finalize the last machine entry we found. */
    maybe_add_to_list (&current, &retval);
    free (current);

    /* Reverse the order of the list so that it appears in file order. */
    current = retval;
    retval = NULL;
    while (current)
    {
      netrc_entry *saved_reference;

      /* Change the direction of the pointers. */
      saved_reference = current->next;
      current->next = retval;

      /* Advance to the next node. */
      retval = current;
      current = saved_reference;
    }

    return retval;
}


/* Return the netrc entry from LIST corresponding to HOST.  NULL is
   returned if no such entry exists. */
netrc_entry *
search_netrc (list, host)
     netrc_entry *list;
     const char *host;
{
    /* Look for the HOST in LIST. */
    while (list)
    {
      if (!list->host)
          /* We hit the default entry. */
          break;

      else if (!strcmp (list->host, host))
          /* We found a matching entry. */
          break;

      list = list->next;
    }

    /* Return the matching entry, or NULL. */
    return list;
}


#ifdef STANDALONE
#include <sys/types.h>
#include <sys/stat.h>

extern int errno;

int
main (argc, argv)
     int argc;
     char **argv;
{
    struct stat sb;
    char *program_name, *file, *target;
    netrc_entry *head, *a;

    if (argc < 2)
    {
      fprintf (stderr, "Usage: %s NETRC [HOSTNAME]...\n", argv[0]);
      exit (1);
    }

    program_name = argv[0];
    file = argv[1];
    target = argv[2];

    if (stat (file, &sb))
    {
      fprintf (stderr, "%s: cannot stat %s: %s\n", argv[0], file,
             strerror (errno));
      exit (1);
    }

    head = parse_netrc (file);
    if (!head)
    {
      fprintf (stderr, "%s: no entries found in %s\n", argv[0], file);
      exit (1);
    }

    if (argc > 2)
    {
      int i, status;
      status = 0;
      for (i = 2; i < argc; i++)
      {
          /* Print out the host that we are checking for. */
          fputs (argv[i], stdout);

          a = search_netrc (head, argv[i]);
          if (a)
          {
            /* Print out the account and password (if any). */
            fputc (' ', stdout);
            fputs (a->account, stdout);
            if (a->password)
            {
                fputc (' ', stdout);
                fputs (a->password, stdout);
            }
          }
          else
            status = 1;

          fputc ('\n', stdout);
      }
      exit (status);
    }

    /* Print out the entire contents of the netrc. */
    a = head;
    while (a)
    {
      /* Print the host name. */
      if (a->host)
          fputs (a->host, stdout);
      else
          fputs ("DEFAULT", stdout);

      fputc (' ', stdout);

      /* Print the account name. */
      fputs (a->account, stdout);

      if (a->password)
      {
          /* Print the password, if there is any. */
          fputc (' ', stdout);
          fputs (a->password, stdout);
      }

      fputc ('\n', stdout);
      a = a->next;
    }

    exit (0);
}
#endif /* STANDALONE */

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