1 /* Read and parse the .netrc file to get hosts, accounts, and passwords.
2 Copyright (C) 1996, Free Software Foundation, Inc.
4 This file is part of GNU Wget.
6 GNU Wget is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 GNU Wget is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with Wget; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
20 /* This file used to be kept in synch with the code in Fetchmail, but
21 the latter has diverged since. */
34 #include <sys/types.h>
46 #define NETRC_FILE_NAME ".netrc"
50 static acc_t *parse_netrc PARAMS ((const char *));
52 /* Return the correct user and password, given the host, user (as
53 given in the URL), and password (as given in the URL). May return
56 If SLACK_DEFAULT is set, allow looking for a "default" account.
57 You will typically turn it off for HTTP. */
59 search_netrc (const char *host, const char **acc, const char **passwd,
63 static int processed_netrc;
70 char *home = home_dir ();
78 char *path = (char *)alloca (strlen (home) + 1
79 + strlen (NETRC_FILE_NAME) + 1);
80 sprintf (path, "%s/%s", home, NETRC_FILE_NAME);
82 err = stat (path, &buf);
84 netrc_list = parse_netrc (path);
87 /* If nothing to do... */
90 /* Acc and password found; all OK. */
93 /* Some data not given -- try finding the host. */
94 for (l = netrc_list; l; l = l->next)
98 else if (!strcasecmp (l->host, host))
105 /* Looking for password in .netrc. */
106 if (!strcmp (l->acc, *acc))
107 *passwd = l->passwd; /* usernames match; password OK */
109 *passwd = NULL; /* usernames don't match */
113 /* If password was given, use it. The account is l->acc. */
126 /* Try looking for the default account. */
127 for (l = netrc_list; l; l = l->next)
144 /* Normally, these functions would be defined by your package. */
145 # define xmalloc malloc
147 # define xstrdup strdup
149 # define xrealloc realloc
151 /* Read a line from FP. The function reallocs the storage as needed
152 to accomodate for any length of the line. Reallocs are done
153 storage exponentially, doubling the storage after each overflow to
154 minimize the number of calls to realloc() and fgets(). The newline
155 character at the end of line is retained.
157 After end-of-file is encountered without anything being read, NULL
158 is returned. NULL is also returned on error. To distinguish
159 between these two cases, use the stdio function ferror(). */
162 read_whole_line (FILE *fp)
166 char *line = (char *)xmalloc (bufsize);
168 while (fgets (line + length, bufsize - length, fp))
170 length += strlen (line + length);
172 if (line[length - 1] == '\n')
174 /* fgets() guarantees to read the whole line, or to use up the
175 space we've given it. We can double the buffer
178 line = xrealloc (line, bufsize);
180 if (length == 0 || ferror (fp))
185 if (length + 1 < bufsize)
186 /* Relieve the memory from our exponential greediness. We say
187 `length + 1' because the terminating \0 is not included in
188 LENGTH. We don't need to zero-terminate the string ourselves,
189 though, because fgets() does that. */
190 line = xrealloc (line, length + 1);
193 #endif /* STANDALONE */
195 /* Maybe add NEWENTRY to the account information list, LIST. NEWENTRY is
196 set to a ready-to-use acc_t, in any event. */
198 maybe_add_to_list (acc_t **newentry, acc_t **list)
204 /* We need an account name in order to add the entry to the list. */
207 /* Free any allocated space. */
216 /* Add the current machine into our list. */
221 /* Allocate a new acc_t structure. */
222 a = (acc_t *)xmalloc (sizeof (acc_t));
225 /* Zero the structure, so that it is ready to use. */
226 memset (a, 0, sizeof(*a));
228 /* Return the new pointers. */
234 /* Helper function for the parser, shifts contents of
235 null-terminated string once character to the left.
236 Used in processing \ and " constructs in the netrc file */
238 shift_left(char *string){
241 for (p=string; *p; ++p)
245 /* Parse a .netrc file (as described in the ftp(1) manual page). */
247 parse_netrc (const char *path)
250 char *line, *p, *tok, *premature_token;
251 acc_t *current, *retval;
254 /* The latest token we've seen in the file. */
257 tok_nothing, tok_account, tok_login, tok_macdef, tok_machine, tok_password
258 } last_token = tok_nothing;
260 current = retval = NULL;
262 fp = fopen (path, "r");
265 fprintf (stderr, _("%s: Cannot read %s (%s).\n"), exec_name,
266 path, strerror (errno));
270 /* Initialize the file data. */
272 premature_token = NULL;
274 /* While there are lines in the file... */
275 while ((line = read_whole_line (fp)))
279 /* Parse the line. */
283 /* Skip leading whitespace. */
284 while (*p && ISSPACE (*p))
287 /* If the line is empty, then end any macro definition. */
288 if (last_token == tok_macdef && !*p)
289 /* End of macro if the line is empty. */
290 last_token = tok_nothing;
292 /* If we are defining macros, then skip parsing the line. */
293 while (*p && last_token != tok_macdef)
295 /* Skip any whitespace. */
296 while (*p && ISSPACE (*p))
299 /* Discard end-of-line comments; also, stop processing if
300 the above `while' merely skipped trailing whitespace. */
301 if (*p == '#' || !*p)
304 /* If the token starts with quotation mark, note this fact,
305 and squash the quotation character */
313 /* Find the end of the token, handling quotes and escapes. */
314 while (*p && (quote ? *p != '"' : !ISSPACE (*p))){
320 /* if field was quoted, squash the trailing quotation mark */
324 /* Null-terminate the token, if it isn't already. */
332 current->acc = xstrdup (tok);
334 premature_token = "login";
338 /* Start a new machine entry. */
339 maybe_add_to_list (¤t, &retval);
340 current->host = xstrdup (tok);
345 current->passwd = xstrdup (tok);
347 premature_token = "password";
350 /* We handle most of tok_macdef above. */
353 premature_token = "macdef";
356 /* We don't handle the account keyword at all. */
359 premature_token = "account";
362 /* We handle tok_nothing below this switch. */
369 fprintf (stderr, _("\
370 %s: %s:%d: warning: \"%s\" token appears before any machine name\n"),
371 exec_name, path, ln, premature_token);
372 premature_token = NULL;
375 if (last_token != tok_nothing)
376 /* We got a value, so reset the token state. */
377 last_token = tok_nothing;
380 /* Fetch the next token. */
381 if (!strcmp (tok, "account"))
382 last_token = tok_account;
383 else if (!strcmp (tok, "default"))
385 maybe_add_to_list (¤t, &retval);
387 else if (!strcmp (tok, "login"))
388 last_token = tok_login;
390 else if (!strcmp (tok, "macdef"))
391 last_token = tok_macdef;
393 else if (!strcmp (tok, "machine"))
394 last_token = tok_machine;
396 else if (!strcmp (tok, "password"))
397 last_token = tok_password;
400 fprintf (stderr, _("%s: %s:%d: unknown token \"%s\"\n"),
401 exec_name, path, ln, tok);
410 /* Finalize the last machine entry we found. */
411 maybe_add_to_list (¤t, &retval);
414 /* Reverse the order of the list so that it appears in file order. */
419 acc_t *saved_reference;
421 /* Change the direction of the pointers. */
422 saved_reference = current->next;
423 current->next = retval;
425 /* Advance to the next node. */
427 current = saved_reference;
434 /* Free a netrc list. */
444 FREE_MAYBE (l->passwd);
445 FREE_MAYBE (l->host);
452 #include <sys/types.h>
453 #include <sys/stat.h>
456 main (int argc, char **argv)
459 char *program_name, *file, *target;
462 if (argc < 2 || argc > 3)
464 fprintf (stderr, _("Usage: %s NETRC [HOSTNAME]\n"), argv[0]);
468 program_name = argv[0];
472 if (stat (file, &sb))
474 fprintf (stderr, _("%s: cannot stat %s: %s\n"), argv[0], file,
479 head = parse_netrc (file);
483 /* Skip if we have a target and this isn't it. */
484 if (target && a->host && strcmp (target, a->host))
492 /* Print the host name if we have no target. */
494 fputs (a->host, stdout);
496 fputs ("DEFAULT", stdout);
501 /* Print the account name. */
502 fputs (a->acc, stdout);
506 /* Print the password, if there is any. */
508 fputs (a->passwd, stdout);
511 fputc ('\n', stdout);
513 /* Exit if we found the target. */
519 /* Exit with failure if we had a target, success otherwise. */
525 #endif /* STANDALONE */