/* netrc.c -- parse the .netrc file to get hosts, accounts, and passwords Gordon Matzigkeit <gord@gnu.ai.mit.edu>, 1996 Copyright assigned to Eric S. Raymond, October 2001. 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 "fetchmail.h" #include "netrc.h" #include "i18n.h" #ifdef STANDALONE /* Normally defined in xstrdup.c. */ # define xstrdup strdup /* Normally defined in xmalloc.c */ # define xmalloc malloc # define xrealloc realloc char *program_name = "netrc"; #endif /* 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(*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 (*p)) p++; /* Discard end-of-line comments. */ if (*p == '#') break; tok = pp = p; /* Find the end of the token. */ while (*p && (quote_char || !isspace (*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 (¤t, &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, GT_("warning: found \"%s\" before any host names"), premature_token); #else fprintf (stderr, GT_("%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 (¤t, &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, GT_("%s:%d: warning: unknown token \"%s\"\n"), file, ln, tok); } } } } fclose (fp); /* Finalize the last machine entry we found. */ maybe_add_to_list (¤t, &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, account) netrc_entry *list; char *host, *account; { /* Look for the HOST in LIST. */ while (list) { if (list->host && !strcmp(list->host, host)) if (!list->account || !strcmp(list->account, account)) /* 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, *host, *account; netrc_entry *head, *a; program_name = argv[0]; file = argv[1]; host = argv[2]; account = argv[3]; 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 (host && account) { int i, status; status = 0; printf("Host: %s, Account: %s\n", host, account); a = search_netrc (head, host, account); if (a) { /* Print out the password (if any). */ if (a->password) { fputc (' ', stdout); fputs (a->password, stdout); } } 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 */