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 #include <sys/types.h> 27 #include <sys/wait.h> 28 29 #include <unistd.h> 30 #include <signal.h> 31 #include <string.h> 32 #include <stdlib.h> 33 #include <stdio.h> 34 #include <errno.h> 35 36 #include "conf.h" 37 38 #define CF_DEFSIZE 32 /* Starting table size */ 39 #define CF_GROW 2 /* Table size multiplier on grow */ 40 41 static FILE * 42 open_conf_pipe(const char *cmd, char *argv[], pid_t *pidp) 43 { 44 int pfds[2]; 45 pid_t pid; 46 struct sigaction act; 47 48 /* Create a pipe and fork a child process to run the command */ 49 50 if (pipe(pfds) == -1) { 51 logerror("failed to create pipe"); 52 return (NULL); 53 } 54 55 if ((pid = fork1()) == -1) { 56 logerror("failed to fork1"); 57 goto err; 58 } 59 60 /* If we're in the child, run the command and output to the pipe */ 61 62 if (pid == 0) { 63 /* 64 * We must set up to ignore these signals, which may be 65 * propogated from the calling process. 66 */ 67 68 act.sa_handler = SIG_IGN; 69 70 (void) sigaction(SIGHUP, &act, NULL); 71 (void) sigaction(SIGALRM, &act, NULL); 72 (void) sigaction(SIGUSR1, &act, NULL); 73 74 (void) close(pfds[0]); 75 (void) close(STDOUT_FILENO); 76 77 if (dup2(pfds[1], STDOUT_FILENO) == -1) { 78 logerror("failed to dup to stdout"); 79 (void) close(pfds[1]); 80 _exit(127); 81 } 82 83 (void) execvp(cmd, argv); 84 logerror("failed to parse configuration file"); 85 _exit(127); 86 /*NOTREACHED*/ 87 } 88 89 /* If we're in the parent, open the read end of the pipe and return */ 90 91 *pidp = pid; 92 (void) close(pfds[1]); 93 return (fdopen(pfds[0], "r")); 94 95 err: 96 (void) close(pfds[0]); 97 (void) close(pfds[1]); 98 return (NULL); 99 } 100 101 static void 102 close_conf_pipe(FILE *fp, pid_t pid) 103 { 104 int status; 105 106 while (waitpid(pid, &status, 0) == -1) { 107 if (errno != EINTR) 108 break; 109 } 110 111 (void) fclose(fp); 112 } 113 114 static int 115 grow_conf_file(conf_t *cf) 116 { 117 int ndsize = cf->cf_dsize ? cf->cf_dsize * CF_GROW : CF_DEFSIZE; 118 void *ndtab = realloc(cf->cf_dtab, sizeof (char *) * ndsize); 119 120 register char *p; 121 int odsize, lines, i; 122 123 if (ndtab == NULL) { 124 logerror("failed to allocate config file table"); 125 return (-1); 126 } 127 128 lines = ndsize - cf->cf_dsize; 129 odsize = cf->cf_dsize; 130 131 cf->cf_dtab = (char **)ndtab; 132 cf->cf_dsize = ndsize; 133 134 for (i = 0; i < lines; i++) { 135 if ((p = (char *)malloc(BUFSIZ)) == NULL) { 136 logerror("failed to allocate config file buffer"); 137 return (-1); 138 } 139 140 cf->cf_dtab[odsize + i] = p; 141 } 142 143 return (0); 144 } 145 146 int 147 conf_open(conf_t *cf, const char *cmd, char *argv[]) 148 { 149 char *line, *p; 150 pid_t pid; 151 FILE *fp; 152 153 (void) memset(cf, 0, sizeof (conf_t)); 154 155 if ((fp = open_conf_pipe(cmd, argv, &pid)) == NULL) 156 return (-1); 157 158 for (;;) { 159 /* If we need to grow the table, do so now */ 160 161 if (cf->cf_lines >= cf->cf_dsize) { 162 if (grow_conf_file(cf) == -1) 163 goto err; 164 } 165 166 line = cf->cf_dtab[cf->cf_lines]; 167 168 /* Read the next line, and break out if we're done */ 169 170 if (fgets(line, BUFSIZ, fp) == NULL) 171 break; 172 173 /* Strip newline and bump line counter */ 174 175 if ((p = strchr(line, '\n')) != NULL) 176 *p = '\0'; 177 178 cf->cf_lines++; 179 } 180 181 close_conf_pipe(fp, pid); 182 return (0); 183 184 err: 185 close_conf_pipe(fp, pid); 186 return (-1); 187 } 188 189 void 190 conf_rewind(conf_t *cf) 191 { 192 cf->cf_ptr = 0; 193 } 194 195 char * 196 conf_read(conf_t *cf) 197 { 198 if (cf->cf_ptr < cf->cf_lines) 199 return (cf->cf_dtab[cf->cf_ptr++]); 200 201 return (NULL); 202 } 203 204 void 205 conf_close(conf_t *cf) 206 { 207 int i; 208 209 if (cf->cf_dtab != NULL) { 210 for (i = 0; i < cf->cf_dsize; i++) 211 free(cf->cf_dtab[i]); 212 free(cf->cf_dtab); 213 } 214 } 215