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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * efdaemon - Emebbed Fcode Interpreter daemon. 31 * 32 * Opens /dev/fcode, detaches from tty and reads a request. Upon successful 33 * return, invokes the Fcode interpreter via the shell script: 34 * /usr/lib/efcode/efcode.sh Waits for completion of the interpreter. 35 */ 36 37 #include <stdio.h> 38 #include <fcntl.h> 39 #include <unistd.h> 40 #include <stdlib.h> 41 #include <strings.h> 42 #include <syslog.h> 43 #include <errno.h> 44 #include <sys/wait.h> 45 #include <sys/fcode.h> 46 47 char efcode_sh_file[] = "/usr/lib/efcode/efcode.sh"; 48 char dev_fcode_file[] = "/dev/fcode"; 49 50 int debug = 0; 51 52 int 53 main(int argc, char **argv) 54 { 55 extern char *optarg; 56 extern int optind, opterr, optopt; 57 int c, fd, nbytes, status; 58 char tc; 59 pid_t pid, tpid; 60 long nerr = 0; 61 int error; 62 63 openlog("efdaemon", LOG_PID|LOG_CONS, LOG_DAEMON); 64 65 while ((c = getopt(argc, argv, "d")) != EOF) { 66 switch (c) { 67 68 case 'd': 69 debug++; 70 break; 71 72 case '?': 73 syslog(LOG_ERR, "Usage: efdaemon [ -d ]\n"); 74 exit(1); 75 } 76 } 77 78 /* 79 * Ensure we can open /dev/fcode 80 */ 81 if ((fd = open(dev_fcode_file, O_RDONLY)) < 0) { 82 /* 83 * Only output message if debug is on. On most systems, 84 * /dev/fcode will not exist, so this message would pollute the 85 * console. 86 */ 87 if (debug) 88 syslog(LOG_ERR, "Can't open %s: %s\n", dev_fcode_file, 89 strerror(errno)); 90 exit(1); 91 } 92 close(fd); 93 94 /* 95 * Ensure that /usr/lib/efcode/efcode.sh exists and is executable. 96 */ 97 if (access(efcode_sh_file, X_OK | R_OK)) { 98 syslog(LOG_ERR, "%s: %s\n", efcode_sh_file, strerror(errno)); 99 exit(1); 100 } 101 102 /* 103 * Fork a child then parent exits so we're a child of initd. 104 */ 105 if ((pid = fork()) < 0) { 106 syslog(LOG_ERR, "Fork failed: %s\n", strerror(errno)); 107 exit(1); 108 } 109 if (pid) 110 exit(0); 111 112 113 /* 114 * detach from tty here. 115 */ 116 setpgrp(); 117 close(0); 118 close(1); 119 close(2); 120 (void) open("/dev/null", O_RDWR); 121 (void) dup(0); 122 (void) dup(0); 123 124 for (;;) { 125 while ((fd = open(dev_fcode_file, O_RDONLY)) < 0) { 126 nerr++; 127 if (nerr == 1) 128 syslog(LOG_ERR, "Can't open %s: %s\n", 129 dev_fcode_file, strerror(errno)); 130 sleep(1); 131 } 132 if (nerr > 1) { 133 syslog(LOG_ERR, "Open on %s failed %d times\n", 134 dev_fcode_file, nerr); 135 } 136 nerr = 0; 137 nbytes = read(fd, &tc, sizeof (tc)); 138 if (nbytes < 0) { 139 syslog(LOG_ERR, "Read of %s: %s\n", dev_fcode_file, 140 strerror(errno)); 141 close(fd); 142 continue; 143 } 144 if (debug) 145 syslog(LOG_DEBUG, "Got request\n"); 146 while ((pid = fork()) < 0) { 147 nerr++; 148 if (nerr == 1) 149 syslog(LOG_ERR, "Fork failed: %s\n", 150 strerror(errno)); 151 sleep(1); 152 } 153 if ((nerr > 1) && pid) { 154 syslog(LOG_ERR, "Fork failed %d times\n", nerr); 155 } 156 nerr = 0; 157 if (pid) { 158 tpid = wait(&status); 159 if (tpid < 0) 160 syslog(LOG_ERR, "Wait error: %s\n", 161 strerror(errno)); 162 else if (pid != tpid) 163 syslog(LOG_ERR, "Wait error, expect pid: %d" 164 " got %d, status: %x\n", pid, tpid, status); 165 else if (status) { 166 syslog(LOG_ERR, "Wait pid: %d status: %x\n", 167 pid, status); 168 if (WIFEXITED(status) && 169 (WEXITSTATUS(status) == 1)) { 170 error = FC_FCODE_ABORT; 171 } else { 172 error = FC_EXEC_FAILED; 173 } 174 if (ioctl(fd, FC_SET_FCODE_ERROR, &error) < 0) { 175 syslog(LOG_ERR, 176 "ioctl(FC_SET_FCODE_ERROR)" 177 " failed\n"); 178 } 179 } else if (debug) 180 syslog(LOG_DEBUG, "Wait: pid: %d\n", pid); 181 close(fd); 182 continue; 183 } 184 if (debug) 185 syslog(LOG_DEBUG, "Child: %d processing request\n", 186 getpid()); 187 fcntl(fd, F_DUP2FD, 0); 188 while (execl("/bin/sh", "sh", efcode_sh_file, NULL)) { 189 nerr++; 190 if (nerr == 1) 191 syslog(LOG_ERR, "execl(/bin/sh) failed: %s\n", 192 strerror(errno)); 193 sleep(1); 194 } 195 } 196 197 return (0); 198 } 199