Annotation of src/lib/libutil/ttyaction.c, Revision 1.13
1.13 ! lukem 1: /* $NetBSD: ttyaction.c,v 1.12 1999/09/16 11:45:51 lukem Exp $ */
1.1 gwr 2:
3: /*-
4: * Copyright (c) 1996 The NetBSD Foundation, Inc.
5: * All rights reserved.
6: *
7: * This code is derived from software contributed to The NetBSD Foundation
8: * by Gordon W. Ross.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by the NetBSD
21: * Foundation, Inc. and its contributors.
22: * 4. Neither the name of The NetBSD Foundation nor the names of its
23: * contributors may be used to endorse or promote products derived
24: * from this software without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
1.8 jtc 29: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.1 gwr 31: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36: * POSSIBILITY OF SUCH DAMAGE.
37: */
38:
39: /*
40: * For each matching "tty" and "action" run the "command."
41: * See fnmatch() for matching the tty name.
42: */
43:
44: #include <sys/types.h>
45: #include <sys/wait.h>
46:
1.12 lukem 47: #include <assert.h>
1.6 mycroft 48: #include <err.h>
1.1 gwr 49: #include <errno.h>
50: #include <fcntl.h>
1.7 mikel 51: #include <fnmatch.h>
1.12 lukem 52: #include <paths.h>
53: #include <stdio.h>
1.1 gwr 54: #include <stdlib.h>
55: #include <string.h>
1.12 lukem 56: #include <unistd.h>
1.1 gwr 57:
58: #include "util.h"
59:
60: #ifndef _PATH_TTYACTION
61: #define _PATH_TTYACTION "/etc/ttyaction"
62: #endif
63:
64: static char *actfile = _PATH_TTYACTION;
1.7 mikel 65: static char *pathenv = __CONCAT("PATH=",_PATH_STDPATH);
1.1 gwr 66:
67: int
68: ttyaction(tty, act, user)
1.9 mycroft 69: const char *tty;
70: const char *act;
71: const char *user;
1.1 gwr 72: {
73: FILE *fp;
74: char *p1, *p2;
75: char *argv[4];
76: char *envp[8];
1.11 kleink 77: char *lastp;
1.1 gwr 78: char line[1024];
79: char env_tty[64];
80: char env_act[64];
81: char env_user[256];
1.10 christos 82: int error, linenum, pid, status;
1.1 gwr 83:
1.12 lukem 84: _DIAGASSERT(tty != NULL);
85: _DIAGASSERT(act != NULL);
86: _DIAGASSERT(user != NULL);
87:
1.1 gwr 88: fp = fopen(actfile, "r");
89: if (fp == NULL)
90: return 0;
91:
1.2 gwr 92: /* Skip the "/dev/" part of the first arg. */
93: if (!strncmp(tty, "/dev/", 5))
94: tty += 5;
95:
1.1 gwr 96: /* Args will be: "sh -c ..." */
97: argv[0] = _PATH_BSHELL;
98: argv[1] = "-c";
99: argv[2] = NULL; /* see below */
100: argv[3] = NULL;
101:
1.3 gwr 102: /*
103: * Environment needs: TTY, ACT, USER
104: */
1.4 gwr 105: snprintf(env_tty, sizeof(env_tty), "TTY=%s", tty);
106: snprintf(env_act, sizeof(env_act), "ACT=%s", act);
107: snprintf(env_user, sizeof(env_user), "USER=%s", user);
1.1 gwr 108: envp[0] = pathenv;
109: envp[1] = env_tty;
110: envp[2] = env_act;
111: envp[3] = env_user;
112: envp[4] = NULL;
113:
114: linenum = 0;
115: status = 0;
116: while (fgets(line, sizeof(line), fp)) {
1.2 gwr 117: linenum++;
118:
119: /* Allow comment lines. */
120: if (line[0] == '#')
121: continue;
1.1 gwr 122:
1.11 kleink 123: p1 = strtok_r(line, " \t", &lastp);
124: p2 = strtok_r(NULL, " \t", &lastp);
1.1 gwr 125: /* This arg goes to end of line. */
1.11 kleink 126: argv[2] = strtok_r(NULL, "\n", &lastp);
1.1 gwr 127: if (!p1 || !p2 || !argv[2]) {
128: warnx("%s: line %d format error", actfile, linenum);
129: continue;
130: }
131: if (fnmatch(p1, tty, 0) || fnmatch(p2, act, 0))
132: continue;
133: /* OK, this is a match. Run the command. */
134: pid = fork();
135: if (pid == -1) {
136: warnx("fork failed: %s", strerror(errno));
137: continue;
138: }
139: if (pid == 0) {
140: /* This is the child. */
1.10 christos 141: error = execve(argv[0], argv, envp);
1.1 gwr 142: /* If we get here, it is an error. */
143: warnx("%s: line %d: exec failed: %s",
144: actfile, linenum, strerror(errno));
1.5 gwr 145: _exit(1);
1.1 gwr 146: }
147: /* This is the parent. */
1.10 christos 148: error = waitpid(pid, &status, 0);
149: if (error == -1) {
1.1 gwr 150: warnx("%s: line %d: wait failed: %s",
151: actfile, linenum, strerror(errno));
152: continue;
153: }
154: if (WTERMSIG(status)) {
155: warnx("%s: line %d: child died with signal %d",
156: actfile, linenum, WTERMSIG(status));
157: continue;
158: }
159: }
160: fclose(fp);
161: return status;
162: }
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