Annotation of src/usr.bin/which/which.c, Revision 1.8
1.7 deraadt 1: /* $OpenBSD: which.c,v 1.6 2002/02/16 21:27:59 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.
1.5 millert 15: * 3. The name of the author may not be used to endorse or promote products
1.1 millert 16: * derived from this software without specific prior written permission.
17: *
18: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
19: * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20: * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21: * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28: */
29:
30: #ifndef lint
1.8 ! millert 31: static const char rcsid[] = "$OpenBSD: which.c,v 1.6 2002/02/16 21:27:59 millert Exp $";
1.1 millert 32: #endif /* not lint */
33:
34: #include <sys/param.h>
35: #include <sys/stat.h>
1.2 millert 36: #include <sys/sysctl.h>
1.1 millert 37:
38: #include <err.h>
39: #include <errno.h>
40: #include <locale.h>
41: #include <stdio.h>
42: #include <stdlib.h>
43: #include <string.h>
44: #include <unistd.h>
45:
1.2 millert 46: #define PROG_WHICH 1
47: #define PROG_WHEREIS 2
48:
1.1 millert 49: extern char *__progname;
50:
1.6 millert 51: int findprog(char *, char *, int, int);
52: void usage(void);
1.1 millert 53:
54: /*
55: * which(1) -- find an executable(s) in the user's path
1.2 millert 56: * whereis(1) -- find an executable(s) in the default user path
1.1 millert 57: *
58: * Return values:
59: * 0 - all executables found
60: * 1 - some found, some not
61: * 2 - none found
62: */
63:
64: int
1.8 ! millert 65: main(int argc, char **argv)
1.1 millert 66: {
67: char *path;
1.2 millert 68: size_t n;
1.3 millert 69: int ch, allmatches = 0, notfound = 0, progmode = PROG_WHICH;
1.1 millert 70:
71: (void)setlocale(LC_ALL, "");
72:
73: if (argc == 1)
74: usage();
75:
1.2 millert 76: /* Don't accept command args but check since old whereis(1) used to */
1.3 millert 77: while ((ch = getopt(argc, argv, "a")) != -1) {
1.2 millert 78: switch (ch) {
1.3 millert 79: case 'a':
80: allmatches = 1;
81: break;
1.2 millert 82: default:
83: usage();
84: }
85: }
86:
87: /*
88: * which(1) uses user's $PATH.
89: * whereis(1) uses user.cs_path from sysctl(3).
90: */
91: if (strcmp(__progname, "whereis") == 0) {
92: int mib[2];
93:
94: progmode = PROG_WHEREIS;
95: mib[0] = CTL_USER;
96: mib[1] = USER_CS_PATH;
97: if (sysctl(mib, 2, NULL, &n, NULL, 0) == -1)
1.4 deraadt 98: err(1, "unable to get length of user.cs_path");
1.2 millert 99: if (n == 0)
1.4 deraadt 100: errx(1, "user.cs_path was zero length!");
1.2 millert 101: if ((path = (char *)malloc(n)) == NULL)
1.4 deraadt 102: errx(1, "can't allocate memory.");
1.2 millert 103: if (sysctl(mib, 2, path, &n, NULL, 0) == -1)
1.4 deraadt 104: err(1, "unable to get user.cs_path");
1.2 millert 105: } else {
106: if ((path = getenv("PATH")) == NULL)
1.4 deraadt 107: err(1, "can't get $PATH from environment");
1.2 millert 108: }
1.1 millert 109:
110: /* To make access(2) do what we want */
111: if (setgid(getegid()))
1.4 deraadt 112: err(1, "Can't set gid to %u", getegid());
1.1 millert 113: if (setuid(geteuid()))
1.4 deraadt 114: err(1, "Can't set uid to %u", geteuid());
1.1 millert 115:
1.3 millert 116: for (n = optind; n < argc; n++)
117: if (findprog(argv[n], path, progmode, allmatches) == 0)
1.1 millert 118: notfound++;
119:
120: exit((notfound == 0) ? 0 : ((notfound == argc - 1) ? 2 : 1));
121: }
122:
123: int
1.8 ! millert 124: findprog(char *prog, char *path, int progmode, int allmatches)
1.1 millert 125: {
126: char *p, filename[MAXPATHLEN];
1.3 millert 127: int proglen, plen, rval = 0;
1.1 millert 128: struct stat sbuf;
129:
130: /* Special case if prog contains '/' */
131: if (strchr(prog, '/')) {
132: if ((stat(prog, &sbuf) == 0) && S_ISREG(sbuf.st_mode) &&
133: access(prog, X_OK) == 0) {
134: (void)puts(prog);
135: return(1);
136: } else {
137: (void)printf("%s: Command not found.\n", prog);
138: return(0);
139: }
140: }
141:
142: if ((path = strdup(path)) == NULL)
1.4 deraadt 143: errx(1, "Can't allocate memory.");
1.1 millert 144:
145: proglen = strlen(prog);
146: while ((p = strsep(&path, ":")) != NULL) {
147: if (*p == '\0')
148: p = ".";
149:
150: plen = strlen(p);
151: while (p[plen-1] == '/')
152: p[--plen] = '\0'; /* strip trailing '/' */
153:
154: if (plen + 1 + proglen >= sizeof(filename)) {
155: warnx("%s/%s: %s", p, prog, strerror(ENAMETOOLONG));
156: return(0);
157: }
158:
1.8 ! millert 159: snprintf(filename, sizeof(filename), "%s/%s", p, prog);
1.1 millert 160: if ((stat(filename, &sbuf) == 0) && S_ISREG(sbuf.st_mode) &&
161: access(filename, X_OK) == 0) {
162: (void)puts(filename);
1.3 millert 163: rval = 1;
164: if (!allmatches)
165: return(rval);
1.1 millert 166: }
167: }
168: (void)free(path);
169:
1.2 millert 170: /* whereis(1) is silent on failure. */
1.3 millert 171: if (!rval && progmode != PROG_WHEREIS)
1.2 millert 172: (void)printf("%s: Command not found.\n", prog);
1.3 millert 173: return(rval);
1.1 millert 174: }
175:
176: void
1.8 ! millert 177: usage(void)
1.1 millert 178: {
1.3 millert 179: (void) fprintf(stderr, "Usage: %s [-a] name [...]\n", __progname);
1.1 millert 180: exit(1);
181: }
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