/*
* 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.
(Makefile.am should have a rule so you can just type "make netrc")
*/
#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 a login name in order to add the entry to the list. */
if (a && ! a->login)
{
/* 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 (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, sizeof(buf) - 1, fp))
{
ln++;
/* Strip trailing CRLF */
for (p = buf + strlen(buf) - 1; (p >= buf) && isspace((unsigned char)*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 char)*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 char)*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->login = (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)
{
fprintf (stderr,
GT_("%s:%d: warning: found \"%s\" before any host names\n"),
file, ln, premature_token);
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 (netrc_entry *list, char *host, char *login)
{
/* Look for the HOST in LIST. */
while (list)
{
if (list->host && !strcmp(list->host, host))
if (!list->login || !strcmp(list->login, login))
/* We found a matching entry. */
break;
list = list->next;
}
/* Return the matching entry, or NULL. */
return list;
}
void
free_netrc(netrc_entry *a) {
while(a) {
netrc_entry *n = a->next;
if (a->password != NULL) {
memset(a->password, 0x55, strlen(a->password));
free(a->password);
}
xfree(a->login);
xfree(a->host);
xfree(a);
a = n;
}
}
#ifdef STANDALONE
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
int main (int argc, char **argv)
{
struct stat sb;
char *program_name, *file, *host, *login;
netrc_entry *head, *a;
program_name = argv[0];
file = argv[1];
host = argv[2];
login = argv[3];
switch (argc) {
case 2:
case 4:
break;
default:
fprintf (stderr, "Usage: %s <file> [<host> <login>]\n", argv[0]);
exit(EXIT_FAILURE);
}
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 && login)
{
int status;
status = EXIT_SUCCESS;
printf("Host: %s, Login: %s\n", host, login);
a = search_netrc (head, host, login);
if (a)
{
/* Print out the password (if any). */
if (a->password)
{
printf("Password: %s\n", a->password);
}
} else
status = EXIT_FAILURE;
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 login name. */
fputs (a->login, stdout);
if (a->password)
{
/* Print the password, if there is any. */
fputc (' ', stdout);
fputs (a->password, stdout);
}
fputc ('\n', stdout);
a = a->next;
}
free_netrc(head);
exit (0);
}
#endif /* STANDALONE */
