2 * passprompt.c - pppd plugin to invoke an external PAP password prompter
4 * Copyright 1999 Paul Mackerras, Alan Curry.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
17 char pppd_version[] = VERSION;
19 static char promptprog[PATH_MAX+1];
20 static int promptprog_refused = 0;
22 static option_t options[] = {
23 { "promptprog", o_string, promptprog,
24 "External PAP password prompting program",
25 OPT_STATIC, NULL, PATH_MAX },
29 static int promptpass(char *user, char *passwd)
36 if (promptprog_refused || promptprog[0] == 0 || access(promptprog, X_OK) < 0)
37 return -1; /* sorry, can't help */
43 warn("Can't make a pipe for %s", promptprog);
46 if ((kid = fork()) == (pid_t) -1) {
47 warn("Can't fork to run %s", promptprog);
53 /* we are the child, exec the program */
54 char *argv[5], fdstr[32];
62 argv[2] = remote_name;
63 sprintf(fdstr, "%d", p[1]);
70 /* we are the parent, read the password from the pipe */
74 red = read(p[0], passwd + readgood, MAXSECRETLEN-1 - readgood);
78 if (errno == EINTR && !got_sigterm)
80 error("Can't read secret from %s: %m", promptprog);
85 } while (readgood < MAXSECRETLEN - 1);
88 /* now wait for child to exit */
89 while (waitpid(kid, &wstat, 0) < 0) {
90 if (errno != EINTR || got_sigterm) {
91 warn("error waiting for %s: %m", promptprog);
99 if (!WIFEXITED(wstat))
100 warn("%s terminated abnormally", promptprog);
101 if (WEXITSTATUS(wstat)) {
102 warn("%s exited with code %d", promptprog, WEXITSTATUS(wstat));
103 /* code when cancel was hit in the prompt prog */
104 if (WEXITSTATUS(wstat) == 128) {
105 promptprog_refused = 1;
112 void plugin_init(void)
114 add_options(options);
115 pap_passwd_hook = promptpass;
117 eaptls_passwd_hook = promptpass;