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 #include <sys/types.h> 36 #include <sys/sbuf.h> 37 #include <sys/wait.h> 38 39 #include <ctype.h> 40 #include <err.h> 41 #include <errno.h> 42 #include <paths.h> 43 #include <signal.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 #define ISMAGICNO(p) \ 50 (p)[0] == magic && isdigit((unsigned char)(p)[1]) && (p)[1] != '0' 51 52 static int exec_shell(const char *, const char *, const char *); 53 static void usage(void); 54 55 int 56 main(int argc, char *argv[]) 57 { 58 struct sbuf *cmdbuf; 59 long arg_max; 60 int ch, debug, i, magic, n, nargs, rval; 61 size_t cmdsize; 62 char buf[4]; 63 char *cmd, *name, *p, *shell, *slashp, *tmpshell; 64 65 debug = 0; 66 magic = '%'; /* Default magic char is `%'. */ 67 nargs = -1; 68 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) 69 switch (ch) { 70 case 'a': 71 if (optarg[0] == '\0' || optarg[1] != '\0') 72 errx(1, 73 "illegal magic character specification"); 74 magic = optarg[0]; 75 break; 76 case 'd': 77 debug = 1; 78 break; 79 case '0': case '1': case '2': case '3': case '4': 80 case '5': case '6': case '7': case '8': case '9': 81 if (nargs != -1) 82 errx(1, 83 "only one -# argument may be specified"); 84 nargs = optopt - '0'; 85 break; 86 default: 87 usage(); 88 } 89 argc -= optind; 90 argv += optind; 91 92 if (argc < 2) 93 usage(); 94 95 /* 96 * The command to run is argv[0], and the args are argv[1..]. 97 * Look for %digit references in the command, remembering the 98 * largest one. 99 */ 100 for (n = 0, p = argv[0]; *p != '\0'; ++p) 101 if (ISMAGICNO(p)) { 102 ++p; 103 if (p[0] - '0' > n) 104 n = p[0] - '0'; 105 } 106 107 /* 108 * Figure out the shell and name arguments to pass to execl() 109 * in exec_shell(). Always malloc() shell and just set name 110 * to point at the last part of shell if there are any backslashes, 111 * otherwise just set it to point at the space malloc()'d. If 112 * SHELL environment variable exists, replace contents of 113 * shell with it. 114 */ 115 shell = name = NULL; 116 tmpshell = getenv("SHELL"); 117 shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL); 118 if (shell == NULL) 119 err(1, "strdup() failed"); 120 slashp = strrchr(shell, '/'); 121 name = (slashp != NULL) ? slashp + 1 : shell; 122 123 /* 124 * If there were any %digit references, then use those, otherwise 125 * build a new command string with sufficient %digit references at 126 * the end to consume (nargs) arguments each time round the loop. 127 * Allocate enough space to hold the maximum command. Save the 128 * size to pass to snprintf(). 129 */ 130 if (n == 0) { 131 cmdsize = strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1; 132 if ((cmd = malloc(cmdsize)) == NULL) 133 err(1, NULL); 134 strlcpy(cmd, argv[0], cmdsize); 135 136 /* If nargs not set, default to a single argument. */ 137 if (nargs == -1) 138 nargs = 1; 139 140 for (i = 1; i <= nargs; i++) { 141 snprintf(buf, sizeof(buf), " %c%d", magic, i); 142 strlcat(cmd, buf, cmdsize); 143 } 144 145 /* 146 * If nargs set to the special value 0, eat a single 147 * argument for each command execution. 148 */ 149 if (nargs == 0) 150 nargs = 1; 151 } else { 152 if ((cmd = strdup(argv[0])) == NULL) 153 err(1, NULL); 154 nargs = n; 155 } 156 157 cmdbuf = sbuf_new(NULL, NULL, 1024, SBUF_AUTOEXTEND); 158 if (cmdbuf == NULL) 159 err(1, NULL); 160 161 arg_max = sysconf(_SC_ARG_MAX); 162 163 /* 164 * (argc) and (argv) are still offset by one to make it simpler to 165 * expand %digit references. At the end of the loop check for (argc) 166 * equals 1 means that all the (argv) has been consumed. 167 */ 168 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { 169 sbuf_clear(cmdbuf); 170 if (sbuf_cat(cmdbuf, "exec ") != 0) 171 err(1, "sbuf"); 172 /* Expand command argv references. */ 173 for (p = cmd; *p != '\0'; ++p) { 174 if (ISMAGICNO(p)) { 175 if (sbuf_cat(cmdbuf, argv[*++p - '0']) != 0) 176 err(1, "sbuf"); 177 } else { 178 if (sbuf_putc(cmdbuf, *p) != 0) 179 err(1, "sbuf"); 180 } 181 if (sbuf_len(cmdbuf) > arg_max) 182 errc(1, E2BIG, NULL); 183 } 184 185 /* Terminate the command string. */ 186 if (sbuf_finish(cmdbuf) != 0) 187 err(1, "sbuf"); 188 189 /* Run the command. */ 190 if (debug) 191 (void)printf("%s\n", sbuf_data(cmdbuf)); 192 else 193 if (exec_shell(sbuf_data(cmdbuf), shell, name)) 194 rval = 1; 195 } 196 197 if (argc != 1) 198 errx(1, "expecting additional argument%s after \"%s\"", 199 (nargs - argc) ? "s" : "", argv[argc - 1]); 200 free(cmd); 201 sbuf_delete(cmdbuf); 202 free(shell); 203 exit(rval); 204 } 205 206 /* 207 * exec_shell -- 208 * Execute a shell command using passed use_shell and use_name 209 * arguments. 210 */ 211 static int 212 exec_shell(const char *command, const char *use_shell, const char *use_name) 213 { 214 pid_t pid; 215 int omask, pstat; 216 sig_t intsave, quitsave; 217 218 if (!command) /* just checking... */ 219 return(1); 220 221 omask = sigblock(sigmask(SIGCHLD)); 222 switch(pid = vfork()) { 223 case -1: /* error */ 224 err(1, "vfork"); 225 case 0: /* child */ 226 (void)sigsetmask(omask); 227 execl(use_shell, use_name, "-c", command, (char *)NULL); 228 warn("%s", use_shell); 229 _exit(1); 230 } 231 intsave = signal(SIGINT, SIG_IGN); 232 quitsave = signal(SIGQUIT, SIG_IGN); 233 pid = waitpid(pid, &pstat, 0); 234 (void)sigsetmask(omask); 235 (void)signal(SIGINT, intsave); 236 (void)signal(SIGQUIT, quitsave); 237 return(pid == -1 ? -1 : pstat); 238 } 239 240 static void 241 usage(void) 242 { 243 244 (void)fprintf(stderr, 245 "usage: apply [-a magic] [-d] [-0123456789] command arguments ...\n"); 246 exit(1); 247 } 248