Merge commit 'b1e7e97d3b60469b243b3b2e22c7d8cbd11c7c90'
[unleashed.git] / usr / src / cmd / syslogd / conf.c
blobc1e10975e2b0556fa90132c9a13aac0bd020a1b7
1 /*
2 * CDDL HEADER START
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
19 * CDDL HEADER END
22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
26 #pragma ident "%Z%%M% %I% %E% SMI"
28 #include <sys/types.h>
29 #include <sys/wait.h>
31 #include <unistd.h>
32 #include <signal.h>
33 #include <string.h>
34 #include <stdlib.h>
35 #include <stdio.h>
36 #include <errno.h>
38 #include "conf.h"
40 #define CF_DEFSIZE 32 /* Starting table size */
41 #define CF_GROW 2 /* Table size multiplier on grow */
43 static FILE *
44 open_conf_pipe(const char *cmd, char *argv[], pid_t *pidp)
46 int pfds[2];
47 pid_t pid;
48 struct sigaction act;
50 /* Create a pipe and fork a child process to run the command */
52 if (pipe(pfds) == -1) {
53 logerror("failed to create pipe");
54 return (NULL);
57 if ((pid = fork1()) == -1) {
58 logerror("failed to fork1");
59 goto err;
62 /* If we're in the child, run the command and output to the pipe */
64 if (pid == 0) {
66 * We must set up to ignore these signals, which may be
67 * propogated from the calling process.
70 act.sa_handler = SIG_IGN;
72 (void) sigaction(SIGHUP, &act, NULL);
73 (void) sigaction(SIGALRM, &act, NULL);
74 (void) sigaction(SIGUSR1, &act, NULL);
76 (void) close(pfds[0]);
77 (void) close(STDOUT_FILENO);
79 if (dup2(pfds[1], STDOUT_FILENO) == -1) {
80 logerror("failed to dup to stdout");
81 (void) close(pfds[1]);
82 _exit(127);
85 (void) execvp(cmd, argv);
86 logerror("failed to parse configuration file");
87 _exit(127);
88 /*NOTREACHED*/
91 /* If we're in the parent, open the read end of the pipe and return */
93 *pidp = pid;
94 (void) close(pfds[1]);
95 return (fdopen(pfds[0], "r"));
97 err:
98 (void) close(pfds[0]);
99 (void) close(pfds[1]);
100 return (NULL);
103 static void
104 close_conf_pipe(FILE *fp, pid_t pid)
106 int status;
108 while (waitpid(pid, &status, 0) == -1) {
109 if (errno != EINTR)
110 break;
113 (void) fclose(fp);
116 static int
117 grow_conf_file(conf_t *cf)
119 int ndsize = cf->cf_dsize ? cf->cf_dsize * CF_GROW : CF_DEFSIZE;
120 void *ndtab = reallocarray(cf->cf_dtab, ndsize, sizeof (char *));
122 register char *p;
123 int odsize, lines, i;
125 if (ndtab == NULL) {
126 logerror("failed to allocate config file table");
127 return (-1);
130 lines = ndsize - cf->cf_dsize;
131 odsize = cf->cf_dsize;
133 cf->cf_dtab = (char **)ndtab;
134 cf->cf_dsize = ndsize;
136 for (i = 0; i < lines; i++) {
137 if ((p = (char *)malloc(BUFSIZ)) == NULL) {
138 logerror("failed to allocate config file buffer");
139 return (-1);
142 cf->cf_dtab[odsize + i] = p;
145 return (0);
149 conf_open(conf_t *cf, const char *cmd, char *argv[])
151 char *line, *p;
152 pid_t pid;
153 FILE *fp;
155 (void) memset(cf, 0, sizeof (conf_t));
157 if ((fp = open_conf_pipe(cmd, argv, &pid)) == NULL)
158 return (-1);
160 for (;;) {
161 /* If we need to grow the table, do so now */
163 if (cf->cf_lines >= cf->cf_dsize) {
164 if (grow_conf_file(cf) == -1)
165 goto err;
168 line = cf->cf_dtab[cf->cf_lines];
170 /* Read the next line, and break out if we're done */
172 if (fgets(line, BUFSIZ, fp) == NULL)
173 break;
175 /* Strip newline and bump line counter */
177 if ((p = strchr(line, '\n')) != NULL)
178 *p = '\0';
180 cf->cf_lines++;
183 close_conf_pipe(fp, pid);
184 return (0);
186 err:
187 close_conf_pipe(fp, pid);
188 return (-1);
191 void
192 conf_rewind(conf_t *cf)
194 cf->cf_ptr = 0;
197 char *
198 conf_read(conf_t *cf)
200 if (cf->cf_ptr < cf->cf_lines)
201 return (cf->cf_dtab[cf->cf_ptr++]);
203 return (NULL);
206 void
207 conf_close(conf_t *cf)
209 int i;
211 if (cf->cf_dtab != NULL) {
212 for (i = 0; i < cf->cf_dsize; i++)
213 free(cf->cf_dtab[i]);
214 free(cf->cf_dtab);