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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> | |
0d0b60a4 | 76 | #include <ctype.h> |
3a827ec1 ER |
77 | #include <fcntl.h> |
78 | #include <sys/mman.h> | |
145e6ea9 | 79 | #include <sys/stat.h> |
6363f2ed ER |
80 | |
81 | #define MAX_LINE 1024 | |
82 | #define MAX_ARGS 32 | |
83 | #define SEARCH_PATH { "/sbin/", "/bin/", "/usr/sbin/", "/usr/bin/", NULL } | |
84 | ||
85 | int exit_status; | |
86 | int ignore_status; | |
87 | ||
88 | void do_execve(char **argv) | |
89 | { | |
90 | char *path[] = SEARCH_PATH; | |
91 | char file[MAX_LINE + 100]; | |
92 | int i; | |
93 | ||
94 | if (**argv == '.' || **argv == '/') | |
95 | execve(argv[0], argv, environ); | |
96 | else | |
97 | for (i = 0; path[i]; i++) { | |
98 | strcpy(file, path[i]); | |
99 | strcat(file, argv[0]); | |
100 | execve(file, argv, environ); | |
101 | } | |
102 | } | |
103 | ||
104 | int exec_and_wait(char **argv) | |
105 | { | |
106 | pid_t pid; | |
107 | ||
108 | pid = fork(); | |
109 | ||
110 | if (pid == -1) { | |
111 | perror("fork"); | |
112 | return -1; | |
113 | } else if (pid == 0) { | |
114 | /* child. */ | |
115 | do_execve(argv); | |
116 | if (!ignore_status) | |
117 | perror(argv[0]); | |
118 | exit(127); | |
119 | } else { | |
120 | int status, err; | |
121 | ||
122 | err = waitpid(pid, &status, 0); | |
123 | if (err < 0) { | |
124 | perror("waitpid"); | |
125 | return -1; | |
126 | } else | |
127 | return WEXITSTATUS(status); | |
128 | } | |
129 | } | |
130 | ||
131 | void split_argv(char **argv, char *s) | |
132 | { | |
133 | char *dst; | |
134 | int argc, delim; | |
135 | ||
136 | for (argc = 0; argc < MAX_ARGS; argc++) { | |
137 | while (*s == ' ' || *s == '\t') | |
138 | s++; | |
139 | ||
140 | if (*s == 0) | |
141 | break; | |
142 | ||
143 | argv[argc] = s; | |
144 | dst = s; | |
145 | ||
146 | while (*s && *s != ' ' && *s != '\t') { | |
147 | if (*s == '\'' || *s == '"') { | |
148 | delim = *s++; | |
149 | while (*s && *s != delim) | |
150 | *dst++ = *s++; | |
151 | if (*s) | |
152 | s++; | |
153 | } else { | |
154 | *dst++ = *s++; | |
155 | } | |
156 | } | |
157 | ||
158 | if (*dst) { | |
159 | if (s == dst) | |
160 | s++; | |
161 | *dst++ = 0; | |
162 | } | |
163 | } | |
164 | ||
165 | argv[argc] = NULL; | |
166 | } | |
167 | ||
168 | void exec_line(char *s) | |
169 | { | |
0d0b60a4 | 170 | char *argv[MAX_ARGS + 1], *c; |
6363f2ed ER |
171 | int ret; |
172 | ||
0d0b60a4 AM |
173 | |
174 | /* skip blank characters */ | |
175 | for (c = s; c && isblank(*c); c++) | |
176 | ; | |
177 | /* skip commented lines */ | |
178 | if (*c == '#') | |
179 | return; | |
180 | ||
6363f2ed ER |
181 | split_argv(argv, s); |
182 | ||
183 | ignore_status = 0; | |
184 | ||
185 | if (**argv == '-') { | |
186 | ignore_status++; | |
187 | (*argv)++; | |
188 | } | |
189 | ||
190 | ret = exec_and_wait(argv); | |
191 | ||
192 | if (ret && !ignore_status) | |
193 | exit_status = ret; | |
194 | } | |
195 | ||
3a827ec1 | 196 | void exec_file(int fd) |
6363f2ed ER |
197 | { |
198 | char line[MAX_LINE]; | |
3a827ec1 ER |
199 | struct stat sbuf; |
200 | char *p, *s, *a; | |
6363f2ed | 201 | |
3a827ec1 ER |
202 | if (fstat(fd, &sbuf) < 0) { |
203 | perror("fstat()"); | |
204 | exit(1); | |
205 | } | |
206 | ||
207 | if ((p = mmap(0, sbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0)) < 0) { | |
208 | perror("mmap()"); | |
209 | exit(1); | |
210 | } | |
211 | ||
212 | for (a = s = p; s < p + sbuf.st_size; s++) { | |
213 | if (*s == '\n') { | |
214 | memcpy(line, a, s - a); | |
215 | line[s - a] = '\0'; | |
216 | exec_line(line); | |
217 | a = ++s; | |
218 | } | |
219 | } | |
220 | ||
221 | // last line was not terminated. | |
222 | if (s == p + sbuf.st_size) { | |
223 | memcpy(line, a, s - a); | |
224 | line[s - a] = '\0'; | |
6363f2ed ER |
225 | exec_line(line); |
226 | } | |
3a827ec1 ER |
227 | |
228 | if (munmap(p, sbuf.st_size) < 0) { | |
229 | perror("munmap()"); | |
230 | exit(1); | |
231 | } | |
6363f2ed ER |
232 | } |
233 | ||
db127c35 AM |
234 | ssize_t error(char *msg) { |
235 | return write(2, msg, strlen(msg)); | |
236 | } | |
237 | ||
6363f2ed ER |
238 | int main(int argc, char **argv) |
239 | { | |
3a827ec1 | 240 | int fd; |
6363f2ed ER |
241 | |
242 | if (argc < 2) { | |
f067f00c ER |
243 | error("USAGE: "); |
244 | error(argv[0]); | |
245 | error(" filename\n"); | |
6363f2ed ER |
246 | exit(1); |
247 | } | |
248 | ||
3a827ec1 | 249 | fd = open(argv[1], O_RDONLY); |
6363f2ed | 250 | |
3a827ec1 | 251 | if (fd == -1) { |
6363f2ed ER |
252 | perror(argv[1]); |
253 | exit(1); | |
254 | } | |
255 | ||
3a827ec1 ER |
256 | exec_file(fd); |
257 | close(fd); | |
6363f2ed ER |
258 | exit(exit_status); |
259 | } |