Annotation of src/usr.bin/apply/apply.c, Revision 1.25
1.25 ! lum 1: /* $OpenBSD: apply.c,v 1.24 2009/10/27 23:59:35 deraadt Exp $ */
1.1 deraadt 2: /* $NetBSD: apply.c,v 1.3 1995/03/25 03:38:23 glass Exp $ */
3:
4: /*-
5: * Copyright (c) 1994
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Jan-Simon Pendry.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
1.14 millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #include <sys/wait.h>
37:
38: #include <ctype.h>
39: #include <err.h>
40: #include <paths.h>
41: #include <signal.h>
42: #include <stdio.h>
43: #include <stdlib.h>
44: #include <string.h>
45: #include <unistd.h>
46:
1.25 ! lum 47: __dead void usage(void);
! 48: static int mysystem(const char *);
1.1 deraadt 49:
50: int
1.15 deraadt 51: main(int argc, char *argv[])
1.1 deraadt 52: {
53: int ch, clen, debug, i, l, magic, n, nargs, rval;
1.17 mickey 54: char *c, *c2, *cmd, *p, *q;
1.12 deraadt 55: size_t len;
1.1 deraadt 56:
57: debug = 0;
58: magic = '%'; /* Default magic char is `%'. */
59: nargs = -1;
1.3 millert 60: while ((ch = getopt(argc, argv, "a:d0123456789")) != -1)
1.1 deraadt 61: switch (ch) {
62: case 'a':
63: if (optarg[1] != '\0')
64: errx(1,
65: "illegal magic character specification.");
66: magic = optarg[0];
67: break;
68: case 'd':
69: debug = 1;
70: break;
71: case '0': case '1': case '2': case '3': case '4':
72: case '5': case '6': case '7': case '8': case '9':
73: if (nargs != -1)
74: errx(1,
75: "only one -# argument may be specified.");
1.20 jaredy 76: nargs = ch - '0';
1.1 deraadt 77: break;
78: default:
79: usage();
80: }
81: argc -= optind;
82: argv += optind;
83:
84: if (argc < 2)
85: usage();
86:
87: /*
88: * The command to run is argv[0], and the args are argv[1..].
89: * Look for %digit references in the command, remembering the
90: * largest one.
91: */
92: for (n = 0, p = argv[0]; *p != '\0'; ++p)
93: if (p[0] == magic && isdigit(p[1]) && p[1] != '0') {
94: ++p;
95: if (p[0] - '0' > n)
96: n = p[0] - '0';
97: }
98:
99: /*
100: * If there were any %digit references, then use those, otherwise
101: * build a new command string with sufficient %digit references at
102: * the end to consume (nargs) arguments each time round the loop.
103: * Allocate enough space to hold the maximum command.
104: */
105: if (n == 0) {
1.22 deraadt 106: len = sizeof("exec ") - 1 +
107: strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1;
108: if ((cmd = malloc(len)) == NULL)
109: err(1, NULL);
110:
1.1 deraadt 111: /* If nargs not set, default to a single argument. */
112: if (nargs == -1)
113: nargs = 1;
114:
1.12 deraadt 115: l = snprintf(cmd, len, "exec %s", argv[0]);
1.19 jsg 116: if (l >= len || l == -1)
117: errx(1, "error building exec string");
1.12 deraadt 118: len -= l;
119: p = cmd + l;
120:
121: for (i = 1; i <= nargs; i++) {
122: l = snprintf(p, len, " %c%d", magic, i);
1.19 jsg 123: if (l >= len || l == -1)
124: errx(1, "error numbering arguments");
1.12 deraadt 125: len -= l;
126: p += l;
127: }
1.1 deraadt 128:
129: /*
130: * If nargs set to the special value 0, eat a single
131: * argument for each command execution.
132: */
133: if (nargs == 0)
134: nargs = 1;
135: } else {
1.22 deraadt 136: if (asprintf(&cmd, "exec %s", argv[0]) == -1)
137: err(1, NULL);
1.1 deraadt 138: nargs = n;
139: }
140:
141: /*
142: * Grab some space in which to build the command. Allocate
143: * as necessary later, but no reason to build it up slowly
144: * for the normal case.
145: */
146: if ((c = malloc(clen = 1024)) == NULL)
147: err(1, NULL);
148:
149: /*
150: * (argc) and (argv) are still offset by one to make it simpler to
151: * expand %digit references. At the end of the loop check for (argc)
152: * equals 1 means that all the (argv) has been consumed.
153: */
154: for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) {
155: /*
156: * Find a max value for the command length, and ensure
157: * there's enough space to build it.
158: */
159: for (l = strlen(cmd), i = 0; i < nargs; i++)
1.6 deraadt 160: l += strlen(argv[i+1]);
1.16 tedu 161: if (l > clen) {
162: if ((c2 = realloc(c, l)) == NULL)
163: err(1, NULL);
164: c = c2;
165: clen = l;
166: }
1.1 deraadt 167:
168: /* Expand command argv references. */
169: for (p = cmd, q = c; *p != '\0'; ++p)
1.12 deraadt 170: if (p[0] == magic && isdigit(p[1]) && p[1] != '0') {
1.13 deraadt 171: strlcpy(q, argv[(++p)[0] - '0'], c + clen - q);
1.12 deraadt 172: q += strlen(q);
173: } else
1.1 deraadt 174: *q++ = *p;
175:
176: /* Terminate the command string. */
177: *q = '\0';
178:
179: /* Run the command. */
180: if (debug)
181: (void)printf("%s\n", c);
1.25 ! lum 182: else if (mysystem(c))
! 183: rval = 1;
1.1 deraadt 184: }
185:
186: if (argc != 1)
187: errx(1, "expecting additional argument%s after \"%s\"",
188: (nargs - argc) ? "s" : "", argv[argc - 1]);
189: exit(rval);
190: }
191:
192: /*
1.25 ! lum 193: * mysystem --
1.1 deraadt 194: * Private version of system(3). Use the user's SHELL environment
195: * variable as the shell to execute.
196: */
1.25 ! lum 197: static int
1.18 deraadt 198: mysystem(const char *command)
1.1 deraadt 199: {
1.25 ! lum 200: static const char *name, *shell;
1.1 deraadt 201: pid_t pid;
1.10 millert 202: int pstat;
203: sigset_t mask, omask;
1.1 deraadt 204: sig_t intsave, quitsave;
205:
206: if (shell == NULL) {
207: if ((shell = getenv("SHELL")) == NULL)
208: shell = _PATH_BSHELL;
209: if ((name = strrchr(shell, '/')) == NULL)
210: name = shell;
211: else
212: ++name;
213: }
214: if (!command) /* just checking... */
215: return(1);
216:
1.10 millert 217: sigemptyset(&mask);
218: sigaddset(&mask, SIGCHLD);
219: sigprocmask(SIG_BLOCK, &mask, &omask);
1.4 bitblt 220: switch(pid = fork()) {
1.1 deraadt 221: case -1: /* error */
222: err(1, "fork");
223: case 0: /* child */
1.10 millert 224: sigprocmask(SIG_SETMASK, &omask, NULL);
1.9 deraadt 225: execl(shell, name, "-c", command, (char *)NULL);
1.1 deraadt 226: err(1, "%s", shell);
227: }
228: intsave = signal(SIGINT, SIG_IGN);
229: quitsave = signal(SIGQUIT, SIG_IGN);
1.5 deraadt 230: pid = waitpid(pid, &pstat, 0);
1.10 millert 231: sigprocmask(SIG_SETMASK, &omask, NULL);
1.1 deraadt 232: (void)signal(SIGINT, intsave);
233: (void)signal(SIGQUIT, quitsave);
1.5 deraadt 234: return(pid == -1 ? -1 : pstat);
1.1 deraadt 235: }
236:
1.25 ! lum 237: __dead void
1.15 deraadt 238: usage(void)
1.1 deraadt 239: {
240: (void)fprintf(stderr,
1.21 jaredy 241: "usage: apply [-#] [-d] [-a magic] command argument ...\n");
1.1 deraadt 242: exit(1);
243: }