1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #if 0 36 #endif 37 38 #include <sys/cdefs.h> 39 #include <sys/types.h> 40 #include <sys/sbuf.h> 41 #include <sys/wait.h> 42 43 #include <ctype.h> 44 #include <err.h> 45 #include <errno.h> 46 #include <paths.h> 47 #include <signal.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <unistd.h> 52 53 #define ISMAGICNO(p) \ 54 (p)[0] == magic && isdigit((unsigned char)(p)[1]) && (p)[1] != '0' 55 56 static int exec_shell(const char *, const char *, const char *); 57 static void usage(void); 58 59 int 60 main(int argc, char *argv[]) 61 { 62 struct sbuf *cmdbuf; 63 long arg_max; 64 int ch, debug, i, magic, n, nargs, rval; 65 size_t cmdsize; 66 char buf[4]; 67 char *cmd, *name, *p, *shell, *slashp, *tmpshell; 68 69 debug = 0; 70 magic = '%'; /* Default magic char is `%'. */ 71 nargs = -1; 72 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 73 switch (ch) { 74 case 'a': 75 if (optarg[0] == '\0' || optarg[1] != '\0') 76 errx(1, 77 "illegal magic character specification"); 78 magic = optarg[0]; 79 break; 80 case 'd': 81 debug = 1; 82 break; 83 case '0': case '1': case '2': case '3': case '4': 84 case '5': case '6': case '7': case '8': case '9': 85 if (nargs != -1) 86 errx(1, 87 "only one -# argument may be specified"); 88 nargs = optopt - '0'; 89 break; 90 default: 91 usage(); 92 } 93 argc -= optind; 94 argv += optind; 95 96 if (argc < 2) 97 usage(); 98 99 /* 100 * The command to run is argv[0], and the args are argv[1..]. 101 * Look for %digit references in the command, remembering the 102 * largest one. 103 */ 104 for (n = 0, p = argv[0]; *p != '\0'; ++p) 105 if (ISMAGICNO(p)) { 106 ++p; 107 if (p[0] - '0' > n) 108 n = p[0] - '0'; 109 } 110 111 /* 112 * Figure out the shell and name arguments to pass to execl() 113 * in exec_shell(). Always malloc() shell and just set name 114 * to point at the last part of shell if there are any backslashes, 115 * otherwise just set it to point at the space malloc()'d. If 116 * SHELL environment variable exists, replace contents of 117 * shell with it. 118 */ 119 shell = name = NULL; 120 tmpshell = getenv("SHELL"); 121 shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL); 122 if (shell == NULL) 123 err(1, "strdup() failed"); 124 slashp = strrchr(shell, '/'); 125 name = (slashp != NULL) ? slashp + 1 : shell; 126 127 /* 128 * If there were any %digit references, then use those, otherwise 129 * build a new command string with sufficient %digit references at 130 * the end to consume (nargs) arguments each time round the loop. 131 * Allocate enough space to hold the maximum command. Save the 132 * size to pass to snprintf(). 133 */ 134 if (n == 0) { 135 cmdsize = strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1; 136 if ((cmd = malloc(cmdsize)) == NULL) 137 err(1, NULL); 138 strlcpy(cmd, argv[0], cmdsize); 139 140 /* If nargs not set, default to a single argument. */ 141 if (nargs == -1) 142 nargs = 1; 143 144 for (i = 1; i <= nargs; i++) { 145 snprintf(buf, sizeof(buf), " %c%d", magic, i); 146 strlcat(cmd, buf, cmdsize); 147 } 148 149 /* 150 * If nargs set to the special value 0, eat a single 151 * argument for each command execution. 152 */ 153 if (nargs == 0) 154 nargs = 1; 155 } else { 156 if ((cmd = strdup(argv[0])) == NULL) 157 err(1, NULL); 158 nargs = n; 159 } 160 161 cmdbuf = sbuf_new(NULL, NULL, 1024, SBUF_AUTOEXTEND); 162 if (cmdbuf == NULL) 163 err(1, NULL); 164 165 arg_max = sysconf(_SC_ARG_MAX); 166 167 /* 168 * (argc) and (argv) are still offset by one to make it simpler to 169 * expand %digit references. At the end of the loop check for (argc) 170 * equals 1 means that all the (argv) has been consumed. 171 */ 172 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 173 sbuf_clear(cmdbuf); 174 if (sbuf_cat(cmdbuf, "exec ") != 0) 175 err(1, "sbuf"); 176 /* Expand command argv references. */ 177 for (p = cmd; *p != '\0'; ++p) { 178 if (ISMAGICNO(p)) { 179 if (sbuf_cat(cmdbuf, argv[*++p - '0']) != 0) 180 err(1, "sbuf"); 181 } else { 182 if (sbuf_putc(cmdbuf, *p) != 0) 183 err(1, "sbuf"); 184 } 185 if (sbuf_len(cmdbuf) > arg_max) 186 errc(1, E2BIG, NULL); 187 } 188 189 /* Terminate the command string. */ 190 if (sbuf_finish(cmdbuf) != 0) 191 err(1, "sbuf"); 192 193 /* Run the command. */ 194 if (debug) 195 (void)printf("%s\n", sbuf_data(cmdbuf)); 196 else 197 if (exec_shell(sbuf_data(cmdbuf), shell, name)) 198 rval = 1; 199 } 200 201 if (argc != 1) 202 errx(1, "expecting additional argument%s after \"%s\"", 203 (nargs - argc) ? "s" : "", argv[argc - 1]); 204 free(cmd); 205 sbuf_delete(cmdbuf); 206 free(shell); 207 exit(rval); 208 } 209 210 /* 211 * exec_shell -- 212 * Execute a shell command using passed use_shell and use_name 213 * arguments. 214 */ 215 static int 216 exec_shell(const char *command, const char *use_shell, const char *use_name) 217 { 218 pid_t pid; 219 int omask, pstat; 220 sig_t intsave, quitsave; 221 222 if (!command) /* just checking... */ 223 return(1); 224 225 omask = sigblock(sigmask(SIGCHLD)); 226 switch(pid = vfork()) { 227 case -1: /* error */ 228 err(1, "vfork"); 229 case 0: /* child */ 230 (void)sigsetmask(omask); 231 execl(use_shell, use_name, "-c", command, (char *)NULL); 232 warn("%s", use_shell); 233 _exit(1); 234 } 235 intsave = signal(SIGINT, SIG_IGN); 236 quitsave = signal(SIGQUIT, SIG_IGN); 237 pid = waitpid(pid, &pstat, 0); 238 (void)sigsetmask(omask); 239 (void)signal(SIGINT, intsave); 240 (void)signal(SIGQUIT, quitsave); 241 return(pid == -1 ? -1 : pstat); 242 } 243 244 static void 245 usage(void) 246 { 247 248 (void)fprintf(stderr, 249 "usage: apply [-a magic] [-d] [-0123456789] command arguments ...\n"); 250 exit(1); 251 } 252