Annotation of src/usr.bin/apply/apply.c, Revision 1.27
1.27 ! deraadt 1: /* $OpenBSD: apply.c,v 1.26 2013/11/25 18:03:17 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;
1.27 ! deraadt 56:
! 57: if (pledge("stdio proc exec", NULL) == -1)
! 58: err(1, "pledge");
1.1 deraadt 59:
60: debug = 0;
61: magic = '%'; /* Default magic char is `%'. */
62: nargs = -1;
1.3 millert 63: while ((ch = getopt(argc, argv, "a:d0123456789")) != -1)
1.1 deraadt 64: switch (ch) {
65: case 'a':
66: if (optarg[1] != '\0')
67: errx(1,
68: "illegal magic character specification.");
69: magic = optarg[0];
70: break;
71: case 'd':
72: debug = 1;
73: break;
74: case '0': case '1': case '2': case '3': case '4':
75: case '5': case '6': case '7': case '8': case '9':
76: if (nargs != -1)
77: errx(1,
78: "only one -# argument may be specified.");
1.20 jaredy 79: nargs = ch - '0';
1.1 deraadt 80: break;
81: default:
82: usage();
83: }
84: argc -= optind;
85: argv += optind;
86:
87: if (argc < 2)
88: usage();
89:
90: /*
91: * The command to run is argv[0], and the args are argv[1..].
92: * Look for %digit references in the command, remembering the
93: * largest one.
94: */
95: for (n = 0, p = argv[0]; *p != '\0'; ++p)
1.26 deraadt 96: if (p[0] == magic &&
97: isdigit((unsigned char)p[1]) && p[1] != '0') {
1.1 deraadt 98: ++p;
99: if (p[0] - '0' > n)
100: n = p[0] - '0';
101: }
102:
103: /*
104: * If there were any %digit references, then use those, otherwise
105: * build a new command string with sufficient %digit references at
106: * the end to consume (nargs) arguments each time round the loop.
107: * Allocate enough space to hold the maximum command.
108: */
109: if (n == 0) {
1.22 deraadt 110: len = sizeof("exec ") - 1 +
111: strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1;
112: if ((cmd = malloc(len)) == NULL)
113: err(1, NULL);
114:
1.1 deraadt 115: /* If nargs not set, default to a single argument. */
116: if (nargs == -1)
117: nargs = 1;
118:
1.12 deraadt 119: l = snprintf(cmd, len, "exec %s", argv[0]);
1.19 jsg 120: if (l >= len || l == -1)
121: errx(1, "error building exec string");
1.12 deraadt 122: len -= l;
123: p = cmd + l;
124:
125: for (i = 1; i <= nargs; i++) {
126: l = snprintf(p, len, " %c%d", magic, i);
1.19 jsg 127: if (l >= len || l == -1)
128: errx(1, "error numbering arguments");
1.12 deraadt 129: len -= l;
130: p += l;
131: }
1.1 deraadt 132:
133: /*
134: * If nargs set to the special value 0, eat a single
135: * argument for each command execution.
136: */
137: if (nargs == 0)
138: nargs = 1;
139: } else {
1.22 deraadt 140: if (asprintf(&cmd, "exec %s", argv[0]) == -1)
141: err(1, NULL);
1.1 deraadt 142: nargs = n;
143: }
144:
145: /*
146: * Grab some space in which to build the command. Allocate
147: * as necessary later, but no reason to build it up slowly
148: * for the normal case.
149: */
150: if ((c = malloc(clen = 1024)) == NULL)
151: err(1, NULL);
152:
153: /*
154: * (argc) and (argv) are still offset by one to make it simpler to
155: * expand %digit references. At the end of the loop check for (argc)
156: * equals 1 means that all the (argv) has been consumed.
157: */
158: for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) {
159: /*
160: * Find a max value for the command length, and ensure
161: * there's enough space to build it.
162: */
163: for (l = strlen(cmd), i = 0; i < nargs; i++)
1.6 deraadt 164: l += strlen(argv[i+1]);
1.16 tedu 165: if (l > clen) {
166: if ((c2 = realloc(c, l)) == NULL)
167: err(1, NULL);
168: c = c2;
169: clen = l;
170: }
1.1 deraadt 171:
172: /* Expand command argv references. */
173: for (p = cmd, q = c; *p != '\0'; ++p)
1.26 deraadt 174: if (p[0] == magic &&
175: isdigit((unsigned char)p[1]) && p[1] != '0') {
1.13 deraadt 176: strlcpy(q, argv[(++p)[0] - '0'], c + clen - q);
1.12 deraadt 177: q += strlen(q);
178: } else
1.1 deraadt 179: *q++ = *p;
180:
181: /* Terminate the command string. */
182: *q = '\0';
183:
184: /* Run the command. */
185: if (debug)
186: (void)printf("%s\n", c);
1.25 lum 187: else if (mysystem(c))
188: rval = 1;
1.1 deraadt 189: }
190:
191: if (argc != 1)
192: errx(1, "expecting additional argument%s after \"%s\"",
193: (nargs - argc) ? "s" : "", argv[argc - 1]);
194: exit(rval);
195: }
196:
197: /*
1.25 lum 198: * mysystem --
1.1 deraadt 199: * Private version of system(3). Use the user's SHELL environment
200: * variable as the shell to execute.
201: */
1.25 lum 202: static int
1.18 deraadt 203: mysystem(const char *command)
1.1 deraadt 204: {
1.25 lum 205: static const char *name, *shell;
1.1 deraadt 206: pid_t pid;
1.10 millert 207: int pstat;
208: sigset_t mask, omask;
1.1 deraadt 209: sig_t intsave, quitsave;
210:
211: if (shell == NULL) {
212: if ((shell = getenv("SHELL")) == NULL)
213: shell = _PATH_BSHELL;
214: if ((name = strrchr(shell, '/')) == NULL)
215: name = shell;
216: else
217: ++name;
218: }
219: if (!command) /* just checking... */
220: return(1);
221:
1.10 millert 222: sigemptyset(&mask);
223: sigaddset(&mask, SIGCHLD);
224: sigprocmask(SIG_BLOCK, &mask, &omask);
1.4 bitblt 225: switch(pid = fork()) {
1.1 deraadt 226: case -1: /* error */
227: err(1, "fork");
228: case 0: /* child */
1.10 millert 229: sigprocmask(SIG_SETMASK, &omask, NULL);
1.9 deraadt 230: execl(shell, name, "-c", command, (char *)NULL);
1.1 deraadt 231: err(1, "%s", shell);
232: }
233: intsave = signal(SIGINT, SIG_IGN);
234: quitsave = signal(SIGQUIT, SIG_IGN);
1.5 deraadt 235: pid = waitpid(pid, &pstat, 0);
1.10 millert 236: sigprocmask(SIG_SETMASK, &omask, NULL);
1.1 deraadt 237: (void)signal(SIGINT, intsave);
238: (void)signal(SIGQUIT, quitsave);
1.5 deraadt 239: return(pid == -1 ? -1 : pstat);
1.1 deraadt 240: }
241:
1.25 lum 242: __dead void
1.15 deraadt 243: usage(void)
1.1 deraadt 244: {
245: (void)fprintf(stderr,
1.21 jaredy 246: "usage: apply [-#] [-d] [-a magic] command argument ...\n");
1.1 deraadt 247: exit(1);
248: }
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