1 /* Read and parse the .netrc file to get hosts, accounts, and passwords.
2 Copyright (C) 1996, 2007, 2008 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 Additional permission under GNU GPL version 3 section 7
21 If you modify this program, or any covered work, by linking or
22 combining it with the OpenSSL project's OpenSSL library (or a
23 modified version of that library), containing parts covered by the
24 terms of the OpenSSL or SSLeay licenses, the Free Software Foundation
25 grants you additional permission to convey the resulting work.
26 Corresponding Source for a non-source form of such a combination
27 shall include the source code for the parts of OpenSSL used as well
28 as that of the covered work. */
30 /* This file used to be kept in synch with the code in Fetchmail, but
31 the latter has diverged since. */
44 #define NETRC_FILE_NAME ".netrc"
48 static acc_t *parse_netrc (const char *);
50 /* Return the correct user and password, given the host, user (as
51 given in the URL), and password (as given in the URL). May return
54 If SLACK_DEFAULT is set, allow looking for a "default" account.
55 You will typically turn it off for HTTP. */
57 search_netrc (const char *host, const char **acc, const char **passwd,
61 static int processed_netrc;
68 char *home = home_dir ();
76 char *path = (char *)alloca (strlen (home) + 1
77 + strlen (NETRC_FILE_NAME) + 1);
78 sprintf (path, "%s/%s", home, NETRC_FILE_NAME);
80 err = stat (path, &buf);
82 netrc_list = parse_netrc (path);
85 /* If nothing to do... */
88 /* Acc and password found; all OK. */
91 /* Some data not given -- try finding the host. */
92 for (l = netrc_list; l; l = l->next)
96 else if (!strcasecmp (l->host, host))
103 /* Looking for password in .netrc. */
104 if (!strcmp (l->acc, *acc))
105 *passwd = l->passwd; /* usernames match; password OK */
107 *passwd = NULL; /* usernames don't match */
111 /* If password was given, use it. The account is l->acc. */
124 /* Try looking for the default account. */
125 for (l = netrc_list; l; l = l->next)
142 /* Normally, these functions would be defined by your package. */
143 # define xmalloc malloc
145 # define xstrdup strdup
147 # define xrealloc realloc
149 /* Read a line from FP. The function reallocs the storage as needed
150 to accomodate for any length of the line. Reallocs are done
151 storage exponentially, doubling the storage after each overflow to
152 minimize the number of calls to realloc() and fgets(). The newline
153 character at the end of line is retained.
155 After end-of-file is encountered without anything being read, NULL
156 is returned. NULL is also returned on error. To distinguish
157 between these two cases, use the stdio function ferror(). */
160 read_whole_line (FILE *fp)
164 char *line = xmalloc (bufsize);
166 while (fgets (line + length, bufsize - length, fp))
168 length += strlen (line + length);
170 if (line[length - 1] == '\n')
172 /* fgets() guarantees to read the whole line, or to use up the
173 space we've given it. We can double the buffer
176 line = xrealloc (line, bufsize);
178 if (length == 0 || ferror (fp))
183 if (length + 1 < bufsize)
184 /* Relieve the memory from our exponential greediness. We say
185 `length + 1' because the terminating \0 is not included in
186 LENGTH. We don't need to zero-terminate the string ourselves,
187 though, because fgets() does that. */
188 line = xrealloc (line, length + 1);
191 #endif /* STANDALONE */
193 /* Maybe add NEWENTRY to the account information list, LIST. NEWENTRY is
194 set to a ready-to-use acc_t, in any event. */
196 maybe_add_to_list (acc_t **newentry, acc_t **list)
202 /* We need an account name in order to add the entry to the list. */
205 /* Free any allocated space. */
206 xfree_null (a->host);
208 xfree_null (a->passwd);
214 /* Add the current machine into our list. */
219 /* Allocate a new acc_t structure. */
220 a = xmalloc (sizeof (acc_t));
223 /* Zero the structure, so that it is ready to use. */
224 memset (a, 0, sizeof(*a));
226 /* Return the new pointers. */
232 /* Helper function for the parser, shifts contents of
233 null-terminated string once character to the left.
234 Used in processing \ and " constructs in the netrc file */
236 shift_left(char *string)
240 for (p=string; *p; ++p)
244 /* Parse a .netrc file (as described in the ftp(1) manual page). */
246 parse_netrc (const char *path)
249 char *line, *p, *tok;
250 const char *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)) != NULL)
279 /* Parse the line. */
283 /* Skip leading whitespace. */
284 while (*p && c_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 && c_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 != '"' : !c_isspace (*p))){
320 /* If field was quoted, squash the trailing quotation mark
321 and reset quote flag. */
328 /* Null-terminate the token, if it isn't already. */
336 current->acc = xstrdup (tok);
338 premature_token = "login";
342 /* Start a new machine entry. */
343 maybe_add_to_list (¤t, &retval);
344 current->host = xstrdup (tok);
349 current->passwd = xstrdup (tok);
351 premature_token = "password";
354 /* We handle most of tok_macdef above. */
357 premature_token = "macdef";
360 /* We don't handle the account keyword at all. */
363 premature_token = "account";
366 /* We handle tok_nothing below this switch. */
373 fprintf (stderr, _("\
374 %s: %s:%d: warning: \"%s\" token appears before any machine name\n"),
375 exec_name, path, ln, premature_token);
376 premature_token = NULL;
379 if (last_token != tok_nothing)
380 /* We got a value, so reset the token state. */
381 last_token = tok_nothing;
384 /* Fetch the next token. */
385 if (!strcmp (tok, "account"))
386 last_token = tok_account;
387 else if (!strcmp (tok, "default"))
389 maybe_add_to_list (¤t, &retval);
391 else if (!strcmp (tok, "login"))
392 last_token = tok_login;
394 else if (!strcmp (tok, "macdef"))
395 last_token = tok_macdef;
397 else if (!strcmp (tok, "machine"))
398 last_token = tok_machine;
400 else if (!strcmp (tok, "password"))
401 last_token = tok_password;
404 fprintf (stderr, _("%s: %s:%d: unknown token \"%s\"\n"),
405 exec_name, path, ln, tok);
414 /* Finalize the last machine entry we found. */
415 maybe_add_to_list (¤t, &retval);
418 /* Reverse the order of the list so that it appears in file order. */
423 acc_t *saved_reference;
425 /* Change the direction of the pointers. */
426 saved_reference = current->next;
427 current->next = retval;
429 /* Advance to the next node. */
431 current = saved_reference;
438 /* Free a netrc list. */
448 xfree_null (l->passwd);
449 xfree_null (l->host);
456 #include <sys/types.h>
457 #include <sys/stat.h>
460 main (int argc, char **argv)
463 char *program_name, *file, *target;
466 if (argc < 2 || argc > 3)
468 fprintf (stderr, _("Usage: %s NETRC [HOSTNAME]\n"), argv[0]);
472 program_name = argv[0];
476 if (stat (file, &sb))
478 fprintf (stderr, _("%s: cannot stat %s: %s\n"), argv[0], file,
483 head = parse_netrc (file);
487 /* Skip if we have a target and this isn't it. */
488 if (target && a->host && strcmp (target, a->host))
496 /* Print the host name if we have no target. */
498 fputs (a->host, stdout);
500 fputs ("DEFAULT", stdout);
505 /* Print the account name. */
506 fputs (a->acc, stdout);
510 /* Print the password, if there is any. */
512 fputs (a->passwd, stdout);
515 fputc ('\n', stdout);
517 /* Exit if we found the target. */
523 /* Exit with failure if we had a target, success otherwise. */
529 #endif /* STANDALONE */