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6363f2ed ER |
1 | /* |
2 | * Copyright (c) 2002 Michal Moskal <malekith@pld-linux.org>. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by Michal Moskal. | |
16 | * 4. Neither the name of the author nor the names of any co-contributors | |
17 | * may be used to endorse or promote products derived from this software | |
18 | * without specific prior written permission. | |
19 | * | |
20 | * THIS SOFTWARE IS PROVIDED BY MICHAL MOSKAL AND CONTRIBUTORS ``AS IS'' AND | |
21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
30 | * SUCH DAMAGE. | |
31 | */ | |
32 | ||
33 | /* | |
34 | * Usage | |
35 | * ~~~~~ | |
36 | * | |
37 | * This simple program is aimed to be used as script interpreter in rpm | |
38 | * %post scriptlets and the like. It opens file passed as first argument | |
39 | * and executes commands found there. Only linear execution is supported. | |
40 | * For example, in glibc.spec: | |
41 | * | |
42 | * %post -p /sbin/postshell | |
43 | * ldconfig | |
44 | * -telinit q | |
45 | * | |
46 | * (full patch like /sbin/ldconfig or -/sbin/tellinit will also work). | |
47 | * | |
48 | * If command starts with - its exit status is ignored. Otherwise last | |
49 | * non-zero exit status is returned. | |
50 | * | |
51 | * There are no builtin commands (yet :). | |
52 | * | |
53 | * Following commands *will* work as expected (as in Bourne shell): | |
54 | * | |
55 | * /bin/echo "Foo bar baz" | |
56 | * insmod foobar options="foo bar 'qux'" | |
57 | * false | |
58 | * | |
59 | * Following *won't*: | |
60 | * | |
61 | * exit 1 | |
62 | * echo foo || echo baz | |
63 | * set -x | |
64 | * | |
65 | * Patches and bugreports are welcome, direct them to Michal Moskal | |
66 | * <malekith@pld-linux.org>. | |
67 | */ | |
68 | ||
69 | #define _GNU_SOURCE | |
70 | #include <sys/types.h> | |
71 | #include <sys/wait.h> | |
72 | #include <unistd.h> | |
73 | #include <stdio.h> | |
74 | #include <stdlib.h> | |
75 | #include <string.h> | |
3a827ec1 ER |
76 | #include <fcntl.h> |
77 | #include <sys/mman.h> | |
6363f2ed ER |
78 | |
79 | #define MAX_LINE 1024 | |
80 | #define MAX_ARGS 32 | |
81 | #define SEARCH_PATH { "/sbin/", "/bin/", "/usr/sbin/", "/usr/bin/", NULL } | |
82 | ||
83 | int exit_status; | |
84 | int ignore_status; | |
85 | ||
86 | void do_execve(char **argv) | |
87 | { | |
88 | char *path[] = SEARCH_PATH; | |
89 | char file[MAX_LINE + 100]; | |
90 | int i; | |
91 | ||
92 | if (**argv == '.' || **argv == '/') | |
93 | execve(argv[0], argv, environ); | |
94 | else | |
95 | for (i = 0; path[i]; i++) { | |
96 | strcpy(file, path[i]); | |
97 | strcat(file, argv[0]); | |
98 | execve(file, argv, environ); | |
99 | } | |
100 | } | |
101 | ||
102 | int exec_and_wait(char **argv) | |
103 | { | |
104 | pid_t pid; | |
105 | ||
106 | pid = fork(); | |
107 | ||
108 | if (pid == -1) { | |
109 | perror("fork"); | |
110 | return -1; | |
111 | } else if (pid == 0) { | |
112 | /* child. */ | |
113 | do_execve(argv); | |
114 | if (!ignore_status) | |
115 | perror(argv[0]); | |
116 | exit(127); | |
117 | } else { | |
118 | int status, err; | |
119 | ||
120 | err = waitpid(pid, &status, 0); | |
121 | if (err < 0) { | |
122 | perror("waitpid"); | |
123 | return -1; | |
124 | } else | |
125 | return WEXITSTATUS(status); | |
126 | } | |
127 | } | |
128 | ||
129 | void split_argv(char **argv, char *s) | |
130 | { | |
131 | char *dst; | |
132 | int argc, delim; | |
133 | ||
134 | for (argc = 0; argc < MAX_ARGS; argc++) { | |
135 | while (*s == ' ' || *s == '\t') | |
136 | s++; | |
137 | ||
138 | if (*s == 0) | |
139 | break; | |
140 | ||
141 | argv[argc] = s; | |
142 | dst = s; | |
143 | ||
144 | while (*s && *s != ' ' && *s != '\t') { | |
145 | if (*s == '\'' || *s == '"') { | |
146 | delim = *s++; | |
147 | while (*s && *s != delim) | |
148 | *dst++ = *s++; | |
149 | if (*s) | |
150 | s++; | |
151 | } else { | |
152 | *dst++ = *s++; | |
153 | } | |
154 | } | |
155 | ||
156 | if (*dst) { | |
157 | if (s == dst) | |
158 | s++; | |
159 | *dst++ = 0; | |
160 | } | |
161 | } | |
162 | ||
163 | argv[argc] = NULL; | |
164 | } | |
165 | ||
166 | void exec_line(char *s) | |
167 | { | |
168 | char *argv[MAX_ARGS + 1]; | |
169 | int ret; | |
170 | ||
171 | split_argv(argv, s); | |
172 | ||
173 | ignore_status = 0; | |
174 | ||
175 | if (**argv == '-') { | |
176 | ignore_status++; | |
177 | (*argv)++; | |
178 | } | |
179 | ||
180 | ret = exec_and_wait(argv); | |
181 | ||
182 | if (ret && !ignore_status) | |
183 | exit_status = ret; | |
184 | } | |
185 | ||
3a827ec1 | 186 | void exec_file(int fd) |
6363f2ed ER |
187 | { |
188 | char line[MAX_LINE]; | |
3a827ec1 ER |
189 | struct stat sbuf; |
190 | char *p, *s, *a; | |
6363f2ed | 191 | |
3a827ec1 ER |
192 | if (fstat(fd, &sbuf) < 0) { |
193 | perror("fstat()"); | |
194 | exit(1); | |
195 | } | |
196 | ||
197 | if ((p = mmap(0, sbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0)) < 0) { | |
198 | perror("mmap()"); | |
199 | exit(1); | |
200 | } | |
201 | ||
202 | for (a = s = p; s < p + sbuf.st_size; s++) { | |
203 | if (*s == '\n') { | |
204 | memcpy(line, a, s - a); | |
205 | line[s - a] = '\0'; | |
206 | exec_line(line); | |
207 | a = ++s; | |
208 | } | |
209 | } | |
210 | ||
211 | // last line was not terminated. | |
212 | if (s == p + sbuf.st_size) { | |
213 | memcpy(line, a, s - a); | |
214 | line[s - a] = '\0'; | |
6363f2ed ER |
215 | exec_line(line); |
216 | } | |
3a827ec1 ER |
217 | |
218 | if (munmap(p, sbuf.st_size) < 0) { | |
219 | perror("munmap()"); | |
220 | exit(1); | |
221 | } | |
6363f2ed ER |
222 | } |
223 | ||
f067f00c | 224 | #define error(msg) write(2, msg, strlen(msg)) |
6363f2ed ER |
225 | int main(int argc, char **argv) |
226 | { | |
3a827ec1 | 227 | int fd; |
6363f2ed ER |
228 | |
229 | if (argc < 2) { | |
f067f00c ER |
230 | error("USAGE: "); |
231 | error(argv[0]); | |
232 | error(" filename\n"); | |
6363f2ed ER |
233 | exit(1); |
234 | } | |
235 | ||
3a827ec1 | 236 | fd = open(argv[1], O_RDONLY); |
6363f2ed | 237 | |
3a827ec1 | 238 | if (fd == -1) { |
6363f2ed ER |
239 | perror(argv[1]); |
240 | exit(1); | |
241 | } | |
242 | ||
3a827ec1 ER |
243 | exec_file(fd); |
244 | close(fd); | |
6363f2ed ER |
245 | exit(exit_status); |
246 | } |