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 #ifndef lint 37 static char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94"; 38 #endif 39 #endif 40 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD$"); 43 44 #include <sys/types.h> 45 #include <sys/sbuf.h> 46 #include <sys/wait.h> 47 48 #include <ctype.h> 49 #include <err.h> 50 #include <errno.h> 51 #include <paths.h> 52 #include <signal.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 #define ISMAGICNO(p) \ 59 (p)[0] == magic && isdigit((unsigned char)(p)[1]) && (p)[1] != '0' 60 61 static int exec_shell(const char *, const char *, const char *); 62 static void usage(void); 63 64 int 65 main(int argc, char *argv[]) 66 { 67 struct sbuf *cmdbuf; 68 long arg_max; 69 int ch, debug, i, magic, n, nargs, rval; 70 size_t cmdsize; 71 char buf[4]; 72 char *cmd, *name, *p, *shell, *slashp, *tmpshell; 73 74 debug = 0; 75 magic = '%'; /* Default magic char is `%'. */ 76 nargs = -1; 77 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 78 switch (ch) { 79 case 'a': 80 if (optarg[0] == '\0' || optarg[1] != '\0') 81 errx(1, 82 "illegal magic character specification"); 83 magic = optarg[0]; 84 break; 85 case 'd': 86 debug = 1; 87 break; 88 case '0': case '1': case '2': case '3': case '4': 89 case '5': case '6': case '7': case '8': case '9': 90 if (nargs != -1) 91 errx(1, 92 "only one -# argument may be specified"); 93 nargs = optopt - '0'; 94 break; 95 default: 96 usage(); 97 } 98 argc -= optind; 99 argv += optind; 100 101 if (argc < 2) 102 usage(); 103 104 /* 105 * The command to run is argv[0], and the args are argv[1..]. 106 * Look for %digit references in the command, remembering the 107 * largest one. 108 */ 109 for (n = 0, p = argv[0]; *p != '\0'; ++p) 110 if (ISMAGICNO(p)) { 111 ++p; 112 if (p[0] - '0' > n) 113 n = p[0] - '0'; 114 } 115 116 /* 117 * Figure out the shell and name arguments to pass to execl() 118 * in exec_shell(). Always malloc() shell and just set name 119 * to point at the last part of shell if there are any backslashes, 120 * otherwise just set it to point at the space malloc()'d. If 121 * SHELL environment variable exists, replace contents of 122 * shell with it. 123 */ 124 shell = name = NULL; 125 tmpshell = getenv("SHELL"); 126 shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL); 127 if (shell == NULL) 128 err(1, "strdup() failed"); 129 slashp = strrchr(shell, '/'); 130 name = (slashp != NULL) ? slashp + 1 : shell; 131 132 /* 133 * If there were any %digit references, then use those, otherwise 134 * build a new command string with sufficient %digit references at 135 * the end to consume (nargs) arguments each time round the loop. 136 * Allocate enough space to hold the maximum command. Save the 137 * size to pass to snprintf(). 138 */ 139 if (n == 0) { 140 cmdsize = strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1; 141 if ((cmd = malloc(cmdsize)) == NULL) 142 err(1, NULL); 143 strlcpy(cmd, argv[0], cmdsize); 144 145 /* If nargs not set, default to a single argument. */ 146 if (nargs == -1) 147 nargs = 1; 148 149 for (i = 1; i <= nargs; i++) { 150 snprintf(buf, sizeof(buf), " %c%d", magic, i); 151 strlcat(cmd, buf, cmdsize); 152 } 153 154 /* 155 * If nargs set to the special value 0, eat a single 156 * argument for each command execution. 157 */ 158 if (nargs == 0) 159 nargs = 1; 160 } else { 161 if ((cmd = strdup(argv[0])) == NULL) 162 err(1, NULL); 163 nargs = n; 164 } 165 166 cmdbuf = sbuf_new(NULL, NULL, 1024, SBUF_AUTOEXTEND); 167 if (cmdbuf == NULL) 168 err(1, NULL); 169 170 arg_max = sysconf(_SC_ARG_MAX); 171 172 /* 173 * (argc) and (argv) are still offset by one to make it simpler to 174 * expand %digit references. At the end of the loop check for (argc) 175 * equals 1 means that all the (argv) has been consumed. 176 */ 177 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 178 sbuf_clear(cmdbuf); 179 if (sbuf_cat(cmdbuf, "exec ") != 0) 180 err(1, "sbuf"); 181 /* Expand command argv references. */ 182 for (p = cmd; *p != '\0'; ++p) { 183 if (ISMAGICNO(p)) { 184 if (sbuf_cat(cmdbuf, argv[*++p - '0']) != 0) 185 err(1, "sbuf"); 186 } else { 187 if (sbuf_putc(cmdbuf, *p) != 0) 188 err(1, "sbuf"); 189 } 190 if (sbuf_len(cmdbuf) > arg_max) 191 errc(1, E2BIG, NULL); 192 } 193 194 /* Terminate the command string. */ 195 if (sbuf_finish(cmdbuf) != 0) 196 err(1, "sbuf"); 197 198 /* Run the command. */ 199 if (debug) 200 (void)printf("%s\n", sbuf_data(cmdbuf)); 201 else 202 if (exec_shell(sbuf_data(cmdbuf), shell, name)) 203 rval = 1; 204 } 205 206 if (argc != 1) 207 errx(1, "expecting additional argument%s after \"%s\"", 208 (nargs - argc) ? "s" : "", argv[argc - 1]); 209 free(cmd); 210 sbuf_delete(cmdbuf); 211 free(shell); 212 exit(rval); 213 } 214 215 /* 216 * exec_shell -- 217 * Execute a shell command using passed use_shell and use_name 218 * arguments. 219 */ 220 static int 221 exec_shell(const char *command, const char *use_shell, const char *use_name) 222 { 223 pid_t pid; 224 int omask, pstat; 225 sig_t intsave, quitsave; 226 227 if (!command) /* just checking... */ 228 return(1); 229 230 omask = sigblock(sigmask(SIGCHLD)); 231 switch(pid = vfork()) { 232 case -1: /* error */ 233 err(1, "vfork"); 234 case 0: /* child */ 235 (void)sigsetmask(omask); 236 execl(use_shell, use_name, "-c", command, (char *)NULL); 237 warn("%s", use_shell); 238 _exit(1); 239 } 240 intsave = signal(SIGINT, SIG_IGN); 241 quitsave = signal(SIGQUIT, SIG_IGN); 242 pid = waitpid(pid, &pstat, 0); 243 (void)sigsetmask(omask); 244 (void)signal(SIGINT, intsave); 245 (void)signal(SIGQUIT, quitsave); 246 return(pid == -1 ? -1 : pstat); 247 } 248 249 static void 250 usage(void) 251 { 252 253 (void)fprintf(stderr, 254 "usage: apply [-a magic] [-d] [-0123456789] command arguments ...\n"); 255 exit(1); 256 } 257