/* $OpenBSD: apply.c,v 1.24 2009/10/27 23:59:35 deraadt Exp $ */ /* $NetBSD: apply.c,v 1.3 1995/03/25 03:38:23 glass Exp $ */ /*- * Copyright (c) 1994 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Jan-Simon Pendry. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include void usage(void); int mysystem(const char *); int main(int argc, char *argv[]) { int ch, clen, debug, i, l, magic, n, nargs, rval; char *c, *c2, *cmd, *p, *q; size_t len; debug = 0; magic = '%'; /* Default magic char is `%'. */ nargs = -1; while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) switch (ch) { case 'a': if (optarg[1] != '\0') errx(1, "illegal magic character specification."); magic = optarg[0]; break; case 'd': debug = 1; break; case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': if (nargs != -1) errx(1, "only one -# argument may be specified."); nargs = ch - '0'; break; default: usage(); } argc -= optind; argv += optind; if (argc < 2) usage(); /* * The command to run is argv[0], and the args are argv[1..]. * Look for %digit references in the command, remembering the * largest one. */ for (n = 0, p = argv[0]; *p != '\0'; ++p) if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { ++p; if (p[0] - '0' > n) n = p[0] - '0'; } /* * If there were any %digit references, then use those, otherwise * build a new command string with sufficient %digit references at * the end to consume (nargs) arguments each time round the loop. * Allocate enough space to hold the maximum command. */ if (n == 0) { len = sizeof("exec ") - 1 + strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1; if ((cmd = malloc(len)) == NULL) err(1, NULL); /* If nargs not set, default to a single argument. */ if (nargs == -1) nargs = 1; l = snprintf(cmd, len, "exec %s", argv[0]); if (l >= len || l == -1) errx(1, "error building exec string"); len -= l; p = cmd + l; for (i = 1; i <= nargs; i++) { l = snprintf(p, len, " %c%d", magic, i); if (l >= len || l == -1) errx(1, "error numbering arguments"); len -= l; p += l; } /* * If nargs set to the special value 0, eat a single * argument for each command execution. */ if (nargs == 0) nargs = 1; } else { if (asprintf(&cmd, "exec %s", argv[0]) == -1) err(1, NULL); nargs = n; } /* * Grab some space in which to build the command. Allocate * as necessary later, but no reason to build it up slowly * for the normal case. */ if ((c = malloc(clen = 1024)) == NULL) err(1, NULL); /* * (argc) and (argv) are still offset by one to make it simpler to * expand %digit references. At the end of the loop check for (argc) * equals 1 means that all the (argv) has been consumed. */ for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) { /* * Find a max value for the command length, and ensure * there's enough space to build it. */ for (l = strlen(cmd), i = 0; i < nargs; i++) l += strlen(argv[i+1]); if (l > clen) { if ((c2 = realloc(c, l)) == NULL) err(1, NULL); c = c2; clen = l; } /* Expand command argv references. */ for (p = cmd, q = c; *p != '\0'; ++p) if (p[0] == magic && isdigit(p[1]) && p[1] != '0') { strlcpy(q, argv[(++p)[0] - '0'], c + clen - q); q += strlen(q); } else *q++ = *p; /* Terminate the command string. */ *q = '\0'; /* Run the command. */ if (debug) (void)printf("%s\n", c); else if (mysystem(c)) rval = 1; } if (argc != 1) errx(1, "expecting additional argument%s after \"%s\"", (nargs - argc) ? "s" : "", argv[argc - 1]); exit(rval); } /* * system -- * Private version of system(3). Use the user's SHELL environment * variable as the shell to execute. */ int mysystem(const char *command) { static char *name, *shell; pid_t pid; int pstat; sigset_t mask, omask; sig_t intsave, quitsave; if (shell == NULL) { if ((shell = getenv("SHELL")) == NULL) shell = _PATH_BSHELL; if ((name = strrchr(shell, '/')) == NULL) name = shell; else ++name; } if (!command) /* just checking... */ return(1); sigemptyset(&mask); sigaddset(&mask, SIGCHLD); sigprocmask(SIG_BLOCK, &mask, &omask); switch(pid = fork()) { case -1: /* error */ err(1, "fork"); case 0: /* child */ sigprocmask(SIG_SETMASK, &omask, NULL); execl(shell, name, "-c", command, (char *)NULL); err(1, "%s", shell); } intsave = signal(SIGINT, SIG_IGN); quitsave = signal(SIGQUIT, SIG_IGN); pid = waitpid(pid, &pstat, 0); sigprocmask(SIG_SETMASK, &omask, NULL); (void)signal(SIGINT, intsave); (void)signal(SIGQUIT, quitsave); return(pid == -1 ? -1 : pstat); } void usage(void) { (void)fprintf(stderr, "usage: apply [-#] [-d] [-a magic] command argument ...\n"); exit(1); }