1 /*
2 * CDDL HEADER START
3 *
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.
7 *
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.
12 *
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]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #pragma ident "%Z%%M% %I% %E% SMI"
27
28 #include <sys/types.h>
29 #include <sys/wait.h>
30
31 #include <unistd.h>
32 #include <signal.h>
33 #include <string.h>
34 #include <stdlib.h>
35 #include <stdio.h>
36 #include <errno.h>
37
38 #include "conf.h"
39
40 #define CF_DEFSIZE 32 /* Starting table size */
41 #define CF_GROW 2 /* Table size multiplier on grow */
42
43 static FILE *
open_conf_pipe(const char * cmd,char * argv[],pid_t * pidp)44 open_conf_pipe(const char *cmd, char *argv[], pid_t *pidp)
45 {
46 int pfds[2];
47 pid_t pid;
48 struct sigaction act;
49
50 /* Create a pipe and fork a child process to run the command */
51
52 if (pipe(pfds) == -1) {
53 logerror("failed to create pipe");
54 return (NULL);
55 }
56
57 if ((pid = fork1()) == -1) {
58 logerror("failed to fork1");
59 goto err;
60 }
61
62 /* If we're in the child, run the command and output to the pipe */
63
64 if (pid == 0) {
65 /*
66 * We must set up to ignore these signals, which may be
67 * propogated from the calling process.
68 */
69
70 act.sa_handler = SIG_IGN;
71
72 (void) sigaction(SIGHUP, &act, NULL);
73 (void) sigaction(SIGALRM, &act, NULL);
74 (void) sigaction(SIGUSR1, &act, NULL);
75
76 (void) close(pfds[0]);
77 (void) close(STDOUT_FILENO);
78
79 if (dup2(pfds[1], STDOUT_FILENO) == -1) {
80 logerror("failed to dup to stdout");
81 (void) close(pfds[1]);
82 _exit(127);
83 }
84
85 (void) execvp(cmd, argv);
86 logerror("failed to parse configuration file");
87 _exit(127);
88 /*NOTREACHED*/
89 }
90
91 /* If we're in the parent, open the read end of the pipe and return */
92
93 *pidp = pid;
94 (void) close(pfds[1]);
95 return (fdopen(pfds[0], "r"));
96
97 err:
98 (void) close(pfds[0]);
99 (void) close(pfds[1]);
100 return (NULL);
101 }
102
103 static void
close_conf_pipe(FILE * fp,pid_t pid)104 close_conf_pipe(FILE *fp, pid_t pid)
105 {
106 int status;
107
108 while (waitpid(pid, &status, 0) == -1) {
109 if (errno != EINTR)
110 break;
111 }
112
113 (void) fclose(fp);
114 }
115
116 static int
grow_conf_file(conf_t * cf)117 grow_conf_file(conf_t *cf)
118 {
119 int ndsize = cf->cf_dsize ? cf->cf_dsize * CF_GROW : CF_DEFSIZE;
120 void *ndtab = realloc(cf->cf_dtab, sizeof (char *) * ndsize);
121
122 register char *p;
123 int odsize, lines, i;
124
125 if (ndtab == NULL) {
126 logerror("failed to allocate config file table");
127 return (-1);
128 }
129
130 lines = ndsize - cf->cf_dsize;
131 odsize = cf->cf_dsize;
132
133 cf->cf_dtab = (char **)ndtab;
134 cf->cf_dsize = ndsize;
135
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);
140 }
141
142 cf->cf_dtab[odsize + i] = p;
143 }
144
145 return (0);
146 }
147
148 int
conf_open(conf_t * cf,const char * cmd,char * argv[])149 conf_open(conf_t *cf, const char *cmd, char *argv[])
150 {
151 char *line, *p;
152 pid_t pid;
153 FILE *fp;
154
155 (void) memset(cf, 0, sizeof (conf_t));
156
157 if ((fp = open_conf_pipe(cmd, argv, &pid)) == NULL)
158 return (-1);
159
160 for (;;) {
161 /* If we need to grow the table, do so now */
162
163 if (cf->cf_lines >= cf->cf_dsize) {
164 if (grow_conf_file(cf) == -1)
165 goto err;
166 }
167
168 line = cf->cf_dtab[cf->cf_lines];
169
170 /* Read the next line, and break out if we're done */
171
172 if (fgets(line, BUFSIZ, fp) == NULL)
173 break;
174
175 /* Strip newline and bump line counter */
176
177 if ((p = strchr(line, '\n')) != NULL)
178 *p = '\0';
179
180 cf->cf_lines++;
181 }
182
183 close_conf_pipe(fp, pid);
184 return (0);
185
186 err:
187 close_conf_pipe(fp, pid);
188 return (-1);
189 }
190
191 void
conf_rewind(conf_t * cf)192 conf_rewind(conf_t *cf)
193 {
194 cf->cf_ptr = 0;
195 }
196
197 char *
conf_read(conf_t * cf)198 conf_read(conf_t *cf)
199 {
200 if (cf->cf_ptr < cf->cf_lines)
201 return (cf->cf_dtab[cf->cf_ptr++]);
202
203 return (NULL);
204 }
205
206 void
conf_close(conf_t * cf)207 conf_close(conf_t *cf)
208 {
209 int i;
210
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);
215 }
216 }
217