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.
22 char pppd_version[] = VERSION;
24 static char promptprog[PATH_MAX+1];
25 static int promptprog_refused = 0;
27 static option_t options[] = {
28 { "promptprog", o_string, promptprog,
29 "External PAP password prompting program",
30 OPT_STATIC, NULL, PATH_MAX },
34 static int promptpass(char *user, char *passwd)
41 if (promptprog_refused || promptprog[0] == 0 || access(promptprog, X_OK) < 0)
42 return -1; /* sorry, can't help */
48 warn("Can't make a pipe for %s", promptprog);
51 if ((kid = fork()) == (pid_t) -1) {
52 warn("Can't fork to run %s", promptprog);
58 /* we are the child, exec the program */
59 char *argv[5], fdstr[32];
67 argv[2] = remote_name;
68 sprintf(fdstr, "%d", p[1]);
75 /* we are the parent, read the password from the pipe */
79 red = read(p[0], passwd + readgood, MAXSECRETLEN-1 - readgood);
83 if (errno == EINTR && !got_sigterm)
85 error("Can't read secret from %s: %m", promptprog);
90 } while (readgood < MAXSECRETLEN - 1);
93 /* now wait for child to exit */
94 while (waitpid(kid, &wstat, 0) < 0) {
95 if (errno != EINTR || got_sigterm) {
96 warn("error waiting for %s: %m", promptprog);
103 passwd[readgood] = 0;
104 if (!WIFEXITED(wstat))
105 warn("%s terminated abnormally", promptprog);
106 if (WEXITSTATUS(wstat)) {
107 warn("%s exited with code %d", promptprog, WEXITSTATUS(wstat));
108 /* code when cancel was hit in the prompt prog */
109 if (WEXITSTATUS(wstat) == 128) {
110 promptprog_refused = 1;
117 void plugin_init(void)
119 add_options(options);
120 pap_passwd_hook = promptpass;
122 eaptls_passwd_hook = promptpass;