Annotation of src/usr.bin/which/which.c, Revision 1.2
1.2 ! millert 1: /* $OpenBSD: which.c,v 1.1 1997/02/21 18:35:00 millert Exp $ */
1.1 millert 2:
3: /*
4: * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by Todd C. Miller.
18: * 4. The name of the author may not be used to endorse or promote products
19: * derived from this software without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
22: * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
23: * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
24: * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
27: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
28: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
29: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
30: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31: */
32:
33: #ifndef lint
1.2 ! millert 34: static char rcsid[] = "$OpenBSD: which.c,v 1.1 1997/02/21 18:35:00 millert Exp $";
1.1 millert 35: #endif /* not lint */
36:
37: #include <sys/param.h>
38: #include <sys/stat.h>
1.2 ! millert 39: #include <sys/sysctl.h>
1.1 millert 40:
41: #include <err.h>
42: #include <errno.h>
43: #include <locale.h>
44: #include <stdio.h>
45: #include <stdlib.h>
46: #include <string.h>
47: #include <unistd.h>
48:
1.2 ! millert 49: #define PROG_WHICH 1
! 50: #define PROG_WHEREIS 2
! 51:
1.1 millert 52: extern char *__progname;
53:
1.2 ! millert 54: int findprog __P((char *, char *, int));
1.1 millert 55: void usage __P((void));
56:
57: /*
58: * which(1) -- find an executable(s) in the user's path
1.2 ! millert 59: * whereis(1) -- find an executable(s) in the default user path
1.1 millert 60: *
61: * Return values:
62: * 0 - all executables found
63: * 1 - some found, some not
64: * 2 - none found
65: */
66:
67: int
68: main(argc, argv)
69: int argc;
70: char **argv;
71: {
72: char *path;
1.2 ! millert 73: size_t n;
! 74: int ch, notfound = 0, progmode = PROG_WHICH;
1.1 millert 75:
76: (void)setlocale(LC_ALL, "");
77:
78: if (argc == 1)
79: usage();
80:
1.2 ! millert 81: /* Don't accept command args but check since old whereis(1) used to */
! 82: while ((ch = getopt(argc, argv, "")) != -1) {
! 83: switch (ch) {
! 84: default:
! 85: usage();
! 86: }
! 87: }
! 88:
! 89: /*
! 90: * which(1) uses user's $PATH.
! 91: * whereis(1) uses user.cs_path from sysctl(3).
! 92: */
! 93: if (strcmp(__progname, "whereis") == 0) {
! 94: int mib[2];
! 95:
! 96: progmode = PROG_WHEREIS;
! 97: mib[0] = CTL_USER;
! 98: mib[1] = USER_CS_PATH;
! 99: if (sysctl(mib, 2, NULL, &n, NULL, 0) == -1)
! 100: err(-1, "unable to get length of user.cs_path");
! 101: if (n == 0)
! 102: errx(-1, "user.cs_path was zero length!");
! 103: if ((path = (char *)malloc(n)) == NULL)
! 104: errx(-1, "can't allocate memory.");
! 105: if (sysctl(mib, 2, path, &n, NULL, 0) == -1)
! 106: err(-1, "unable to get user.cs_path");
! 107: } else {
! 108: if ((path = getenv("PATH")) == NULL)
! 109: err(-1, "can't get $PATH from environment");
! 110: }
1.1 millert 111:
112: /* To make access(2) do what we want */
113: if (setgid(getegid()))
114: err(-1, "Can't set gid to %u", getegid());
115: if (setuid(geteuid()))
116: err(-1, "Can't set uid to %u", geteuid());
117:
118: for (n = 1; n < argc; n++)
1.2 ! millert 119: if (findprog(argv[n], path, progmode) == 0)
1.1 millert 120: notfound++;
121:
122: exit((notfound == 0) ? 0 : ((notfound == argc - 1) ? 2 : 1));
123: }
124:
125: int
1.2 ! millert 126: findprog(prog, path, progmode)
1.1 millert 127: char *prog;
128: char *path;
1.2 ! millert 129: int progmode;
1.1 millert 130: {
131: char *p, filename[MAXPATHLEN];
132: int proglen, plen;
133: struct stat sbuf;
134:
135: /* Special case if prog contains '/' */
136: if (strchr(prog, '/')) {
137: if ((stat(prog, &sbuf) == 0) && S_ISREG(sbuf.st_mode) &&
138: access(prog, X_OK) == 0) {
139: (void)puts(prog);
140: return(1);
141: } else {
142: (void)printf("%s: Command not found.\n", prog);
143: return(0);
144: }
145: }
146:
147: if ((path = strdup(path)) == NULL)
1.2 ! millert 148: errx(-1, "Can't allocate memory.");
1.1 millert 149:
150: proglen = strlen(prog);
151: while ((p = strsep(&path, ":")) != NULL) {
152: if (*p == '\0')
153: p = ".";
154:
155: plen = strlen(p);
156: while (p[plen-1] == '/')
157: p[--plen] = '\0'; /* strip trailing '/' */
158:
159: if (plen + 1 + proglen >= sizeof(filename)) {
160: warnx("%s/%s: %s", p, prog, strerror(ENAMETOOLONG));
161: return(0);
162: }
163:
164: (void)strcpy(filename, p);
165: filename[plen] = '/';
166: (void)strcpy(filename + plen + 1, prog);
167: if ((stat(filename, &sbuf) == 0) && S_ISREG(sbuf.st_mode) &&
168: access(filename, X_OK) == 0) {
169: (void)puts(filename);
170: return(1);
171: }
172: }
173: (void)free(path);
174:
1.2 ! millert 175: /* whereis(1) is silent on failure. */
! 176: if (progmode != PROG_WHEREIS)
! 177: (void)printf("%s: Command not found.\n", prog);
1.1 millert 178: return(0);
179: }
180:
181: void
182: usage()
183: {
1.2 ! millert 184: (void) fprintf(stderr, "Usage: %s name [...]\n", __progname);
1.1 millert 185: exit(1);
186: }
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