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 3 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, see <http://www.gnu.org/licenses/>.
19 In addition, as a special exception, the Free Software Foundation
20 gives permission to link the code of its release of Wget with the
21 OpenSSL project's "OpenSSL" library (or with modified versions of it
22 that use the same license as the "OpenSSL" library), and distribute
23 the linked executables. You must obey the GNU General Public License
24 in all respects for all of the code used other than "OpenSSL". If you
25 modify this file, you may extend this exception to your version of the
26 file, but you are not obligated to do so. If you do not wish to do
27 so, delete this exception statement from your version. */
29 /* This file used to be kept in synch with the code in Fetchmail, but
30 the latter has diverged since. */
46 #define NETRC_FILE_NAME ".netrc"
50 static acc_t *parse_netrc (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 = 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. */
208 xfree_null (a->host);
210 xfree_null (a->passwd);
216 /* Add the current machine into our list. */
221 /* Allocate a new acc_t structure. */
222 a = 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)
242 for (p=string; *p; ++p)
246 /* Parse a .netrc file (as described in the ftp(1) manual page). */
248 parse_netrc (const char *path)
251 char *line, *p, *tok;
252 const char *premature_token;
253 acc_t *current, *retval;
256 /* The latest token we've seen in the file. */
259 tok_nothing, tok_account, tok_login, tok_macdef, tok_machine, tok_password
260 } last_token = tok_nothing;
262 current = retval = NULL;
264 fp = fopen (path, "r");
267 fprintf (stderr, _("%s: Cannot read %s (%s).\n"), exec_name,
268 path, strerror (errno));
272 /* Initialize the file data. */
274 premature_token = NULL;
276 /* While there are lines in the file... */
277 while ((line = read_whole_line (fp)) != NULL)
281 /* Parse the line. */
285 /* Skip leading whitespace. */
286 while (*p && ISSPACE (*p))
289 /* If the line is empty, then end any macro definition. */
290 if (last_token == tok_macdef && !*p)
291 /* End of macro if the line is empty. */
292 last_token = tok_nothing;
294 /* If we are defining macros, then skip parsing the line. */
295 while (*p && last_token != tok_macdef)
297 /* Skip any whitespace. */
298 while (*p && ISSPACE (*p))
301 /* Discard end-of-line comments; also, stop processing if
302 the above `while' merely skipped trailing whitespace. */
303 if (*p == '#' || !*p)
306 /* If the token starts with quotation mark, note this fact,
307 and squash the quotation character */
315 /* Find the end of the token, handling quotes and escapes. */
316 while (*p && (quote ? *p != '"' : !ISSPACE (*p))){
322 /* If field was quoted, squash the trailing quotation mark
323 and reset quote flag. */
330 /* Null-terminate the token, if it isn't already. */
338 current->acc = xstrdup (tok);
340 premature_token = "login";
344 /* Start a new machine entry. */
345 maybe_add_to_list (¤t, &retval);
346 current->host = xstrdup (tok);
351 current->passwd = xstrdup (tok);
353 premature_token = "password";
356 /* We handle most of tok_macdef above. */
359 premature_token = "macdef";
362 /* We don't handle the account keyword at all. */
365 premature_token = "account";
368 /* We handle tok_nothing below this switch. */
375 fprintf (stderr, _("\
376 %s: %s:%d: warning: \"%s\" token appears before any machine name\n"),
377 exec_name, path, ln, premature_token);
378 premature_token = NULL;
381 if (last_token != tok_nothing)
382 /* We got a value, so reset the token state. */
383 last_token = tok_nothing;
386 /* Fetch the next token. */
387 if (!strcmp (tok, "account"))
388 last_token = tok_account;
389 else if (!strcmp (tok, "default"))
391 maybe_add_to_list (¤t, &retval);
393 else if (!strcmp (tok, "login"))
394 last_token = tok_login;
396 else if (!strcmp (tok, "macdef"))
397 last_token = tok_macdef;
399 else if (!strcmp (tok, "machine"))
400 last_token = tok_machine;
402 else if (!strcmp (tok, "password"))
403 last_token = tok_password;
406 fprintf (stderr, _("%s: %s:%d: unknown token \"%s\"\n"),
407 exec_name, path, ln, tok);
416 /* Finalize the last machine entry we found. */
417 maybe_add_to_list (¤t, &retval);
420 /* Reverse the order of the list so that it appears in file order. */
425 acc_t *saved_reference;
427 /* Change the direction of the pointers. */
428 saved_reference = current->next;
429 current->next = retval;
431 /* Advance to the next node. */
433 current = saved_reference;
440 /* Free a netrc list. */
450 xfree_null (l->passwd);
451 xfree_null (l->host);
458 #include <sys/types.h>
459 #include <sys/stat.h>
462 main (int argc, char **argv)
465 char *program_name, *file, *target;
468 if (argc < 2 || argc > 3)
470 fprintf (stderr, _("Usage: %s NETRC [HOSTNAME]\n"), argv[0]);
474 program_name = argv[0];
478 if (stat (file, &sb))
480 fprintf (stderr, _("%s: cannot stat %s: %s\n"), argv[0], file,
485 head = parse_netrc (file);
489 /* Skip if we have a target and this isn't it. */
490 if (target && a->host && strcmp (target, a->host))
498 /* Print the host name if we have no target. */
500 fputs (a->host, stdout);
502 fputs ("DEFAULT", stdout);
507 /* Print the account name. */
508 fputs (a->acc, stdout);
512 /* Print the password, if there is any. */
514 fputs (a->passwd, stdout);
517 fputc ('\n', stdout);
519 /* Exit if we found the target. */
525 /* Exit with failure if we had a target, success otherwise. */
531 #endif /* STANDALONE */