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 * 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 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 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 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 192 conf_rewind(conf_t *cf) 193 { 194 cf->cf_ptr = 0; 195 } 196 197 char * 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 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