1/*-
2 * Copyright (c) 2002 Tim J. Robbins.
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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include "namespace.h"
28#include <sys/cdefs.h>
29#include <sys/types.h>
30#include <sys/wait.h>
31#include <fcntl.h>
32#include <paths.h>
33#include <stdio.h>
34#include <stdlib.h>
35#include <string.h>
36#include <unistd.h>
37#include <wordexp.h>
38#include "un-namespace.h"
39
| 1/*-
2 * Copyright (c) 2002 Tim J. Robbins.
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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include "namespace.h"
28#include <sys/cdefs.h>
29#include <sys/types.h>
30#include <sys/wait.h>
31#include <fcntl.h>
32#include <paths.h>
33#include <stdio.h>
34#include <stdlib.h>
35#include <string.h>
36#include <unistd.h>
37#include <wordexp.h>
38#include "un-namespace.h"
39
|
41
42static int we_askshell(const char *, wordexp_t *, int);
43static int we_check(const char *, int);
44
45/*
46 * wordexp --
47 * Perform shell word expansion on `words' and place the resulting list
48 * of words in `we'. See wordexp(3).
49 *
50 * Specified by IEEE Std. 1003.1-2001.
51 */
52int
53wordexp(const char * __restrict words, wordexp_t * __restrict we, int flags)
54{
55 int error;
56
57 if (flags & WRDE_REUSE)
58 wordfree(we);
59 if ((flags & WRDE_APPEND) == 0) {
60 we->we_wordc = 0;
61 we->we_wordv = NULL;
62 we->we_strings = NULL;
63 we->we_nbytes = 0;
64 }
65 if ((error = we_check(words, flags)) != 0) {
66 wordfree(we);
67 return (error);
68 }
69 if ((error = we_askshell(words, we, flags)) != 0) {
70 wordfree(we);
71 return (error);
72 }
73 return (0);
74}
75
76/*
77 * we_askshell --
78 * Use the `wordexp' /bin/sh builtin function to do most of the work
79 * in expanding the word string. This function is complicated by
80 * memory management.
81 */
82static int
83we_askshell(const char *words, wordexp_t *we, int flags)
84{
85 int pdes[2]; /* Pipe to child */
86 char bbuf[9]; /* Buffer for byte count */
87 char wbuf[9]; /* Buffer for word count */
88 long nwords, nbytes; /* Number of words, bytes from child */
89 long i; /* Handy integer */
90 size_t sofs; /* Offset into we->we_strings */
91 size_t vofs; /* Offset into we->we_wordv */
92 pid_t pid; /* Process ID of child */
93 int status; /* Child exit status */
94 char *ifs; /* IFS env. var. */
95 char *np, *p; /* Handy pointers */
96 char *nstrings; /* Temporary for realloc() */
97 char **nwv; /* Temporary for realloc() */
98
99 if ((ifs = getenv("IFS")) == NULL)
100 ifs = " \t\n";
101
102 if (pipe(pdes) < 0)
103 return (WRDE_NOSPACE); /* XXX */
104 if ((pid = fork()) < 0) {
105 close(pdes[0]);
106 close(pdes[1]);
107 return (WRDE_NOSPACE); /* XXX */
108 }
109 else if (pid == 0) {
110 /*
111 * We are the child; just get /bin/sh to run the wordexp
112 * builtin on `words'.
113 */
114 int devnull;
115 char *cmd;
116
117 close(pdes[0]);
118 if (dup2(pdes[1], STDOUT_FILENO) < 0)
119 _exit(1);
120 close(pdes[1]);
121 if (asprintf(&cmd, "wordexp%c%s\n", *ifs, words) < 0)
122 _exit(1);
123 if ((flags & WRDE_SHOWERR) == 0) {
124 if ((devnull = open(_PATH_DEVNULL, O_RDWR, 0666)) < 0)
125 _exit(1);
126 if (dup2(devnull, STDERR_FILENO) < 0)
127 _exit(1);
128 close(devnull);
129 }
130 execl(_PATH_BSHELL, "sh", flags & WRDE_UNDEF ? "-u" : "+u",
131 "-c", cmd, NULL);
132 _exit(1);
133 }
134
135 /*
136 * We are the parent; read the output of the shell wordexp function,
137 * which is a 32-bit hexadecimal word count, a 32-bit hexadecimal
138 * byte count (not including terminating null bytes), followed by
139 * the expanded words separated by nulls.
140 */
141 close(pdes[1]);
142 if (read(pdes[0], wbuf, 8) != 8 || read(pdes[0], bbuf, 8) != 8) {
143 close(pdes[0]);
144 return (WRDE_NOSPACE); /* XXX */
145 }
146 wbuf[8] = bbuf[8] = '\0';
147 nwords = strtol(wbuf, NULL, 16);
148 nbytes = strtol(bbuf, NULL, 16) + nwords;
149
150 /*
151 * Allocate or reallocate (when flags & WRDE_APPEND) the word vector
152 * and string storage buffers for the expanded words we're about to
153 * read from the child.
154 */
155 sofs = we->we_nbytes;
156 vofs = we->we_wordc;
157 we->we_wordc += nwords;
158 we->we_nbytes += nbytes;
159 if ((nwv = realloc(we->we_wordv, (we->we_wordc + 1 +
160 (flags & WRDE_DOOFS ? we->we_offs : 0)) *
161 sizeof(char *))) == NULL) {
162 close(pdes[0]);
163 return (WRDE_NOSPACE);
164 }
165 we->we_wordv = nwv;
166 if ((nstrings = realloc(we->we_strings, we->we_nbytes)) == NULL) {
167 close(pdes[0]);
168 return (WRDE_NOSPACE);
169 }
170 for (i = 0; i < vofs; i++)
171 if (we->we_wordv[i] != NULL)
172 we->we_wordv[i] += nstrings - we->we_strings;
173 we->we_strings = nstrings;
174
175 if (read(pdes[0], we->we_strings + sofs, nbytes) != nbytes) {
176 close(pdes[0]);
177 return (WRDE_NOSPACE); /* XXX */
178 }
179
180 if (waitpid(pid, &status, 0) < 0 || !WIFEXITED(status) ||
181 WEXITSTATUS(status) != 0) {
182 close(pdes[0]);
183 return (flags & WRDE_UNDEF ? WRDE_BADVAL : WRDE_SYNTAX);
184 }
185 close(pdes[0]);
186
187 /*
188 * Break the null-terminated expanded word strings out into
189 * the vector.
190 */
191 if (vofs == 0 && flags & WRDE_DOOFS)
192 while (vofs < we->we_offs)
193 we->we_wordv[vofs++] = NULL;
194 p = we->we_strings + sofs;
195 while (nwords-- != 0) {
196 we->we_wordv[vofs++] = p;
197 if ((np = memchr(p, '\0', nbytes)) == NULL)
198 return (WRDE_NOSPACE); /* XXX */
199 nbytes -= np - p + 1;
200 p = np + 1;
201 }
202 we->we_wordv[vofs] = NULL;
203
204 return (0);
205}
206
207/*
208 * we_check --
209 * Check that the string contains none of the following unquoted
210 * special characters: <newline> |&;<>(){}
211 * or command substitutions when WRDE_NOCMD is set in flags.
212 */
| 41
42static int we_askshell(const char *, wordexp_t *, int);
43static int we_check(const char *, int);
44
45/*
46 * wordexp --
47 * Perform shell word expansion on `words' and place the resulting list
48 * of words in `we'. See wordexp(3).
49 *
50 * Specified by IEEE Std. 1003.1-2001.
51 */
52int
53wordexp(const char * __restrict words, wordexp_t * __restrict we, int flags)
54{
55 int error;
56
57 if (flags & WRDE_REUSE)
58 wordfree(we);
59 if ((flags & WRDE_APPEND) == 0) {
60 we->we_wordc = 0;
61 we->we_wordv = NULL;
62 we->we_strings = NULL;
63 we->we_nbytes = 0;
64 }
65 if ((error = we_check(words, flags)) != 0) {
66 wordfree(we);
67 return (error);
68 }
69 if ((error = we_askshell(words, we, flags)) != 0) {
70 wordfree(we);
71 return (error);
72 }
73 return (0);
74}
75
76/*
77 * we_askshell --
78 * Use the `wordexp' /bin/sh builtin function to do most of the work
79 * in expanding the word string. This function is complicated by
80 * memory management.
81 */
82static int
83we_askshell(const char *words, wordexp_t *we, int flags)
84{
85 int pdes[2]; /* Pipe to child */
86 char bbuf[9]; /* Buffer for byte count */
87 char wbuf[9]; /* Buffer for word count */
88 long nwords, nbytes; /* Number of words, bytes from child */
89 long i; /* Handy integer */
90 size_t sofs; /* Offset into we->we_strings */
91 size_t vofs; /* Offset into we->we_wordv */
92 pid_t pid; /* Process ID of child */
93 int status; /* Child exit status */
94 char *ifs; /* IFS env. var. */
95 char *np, *p; /* Handy pointers */
96 char *nstrings; /* Temporary for realloc() */
97 char **nwv; /* Temporary for realloc() */
98
99 if ((ifs = getenv("IFS")) == NULL)
100 ifs = " \t\n";
101
102 if (pipe(pdes) < 0)
103 return (WRDE_NOSPACE); /* XXX */
104 if ((pid = fork()) < 0) {
105 close(pdes[0]);
106 close(pdes[1]);
107 return (WRDE_NOSPACE); /* XXX */
108 }
109 else if (pid == 0) {
110 /*
111 * We are the child; just get /bin/sh to run the wordexp
112 * builtin on `words'.
113 */
114 int devnull;
115 char *cmd;
116
117 close(pdes[0]);
118 if (dup2(pdes[1], STDOUT_FILENO) < 0)
119 _exit(1);
120 close(pdes[1]);
121 if (asprintf(&cmd, "wordexp%c%s\n", *ifs, words) < 0)
122 _exit(1);
123 if ((flags & WRDE_SHOWERR) == 0) {
124 if ((devnull = open(_PATH_DEVNULL, O_RDWR, 0666)) < 0)
125 _exit(1);
126 if (dup2(devnull, STDERR_FILENO) < 0)
127 _exit(1);
128 close(devnull);
129 }
130 execl(_PATH_BSHELL, "sh", flags & WRDE_UNDEF ? "-u" : "+u",
131 "-c", cmd, NULL);
132 _exit(1);
133 }
134
135 /*
136 * We are the parent; read the output of the shell wordexp function,
137 * which is a 32-bit hexadecimal word count, a 32-bit hexadecimal
138 * byte count (not including terminating null bytes), followed by
139 * the expanded words separated by nulls.
140 */
141 close(pdes[1]);
142 if (read(pdes[0], wbuf, 8) != 8 || read(pdes[0], bbuf, 8) != 8) {
143 close(pdes[0]);
144 return (WRDE_NOSPACE); /* XXX */
145 }
146 wbuf[8] = bbuf[8] = '\0';
147 nwords = strtol(wbuf, NULL, 16);
148 nbytes = strtol(bbuf, NULL, 16) + nwords;
149
150 /*
151 * Allocate or reallocate (when flags & WRDE_APPEND) the word vector
152 * and string storage buffers for the expanded words we're about to
153 * read from the child.
154 */
155 sofs = we->we_nbytes;
156 vofs = we->we_wordc;
157 we->we_wordc += nwords;
158 we->we_nbytes += nbytes;
159 if ((nwv = realloc(we->we_wordv, (we->we_wordc + 1 +
160 (flags & WRDE_DOOFS ? we->we_offs : 0)) *
161 sizeof(char *))) == NULL) {
162 close(pdes[0]);
163 return (WRDE_NOSPACE);
164 }
165 we->we_wordv = nwv;
166 if ((nstrings = realloc(we->we_strings, we->we_nbytes)) == NULL) {
167 close(pdes[0]);
168 return (WRDE_NOSPACE);
169 }
170 for (i = 0; i < vofs; i++)
171 if (we->we_wordv[i] != NULL)
172 we->we_wordv[i] += nstrings - we->we_strings;
173 we->we_strings = nstrings;
174
175 if (read(pdes[0], we->we_strings + sofs, nbytes) != nbytes) {
176 close(pdes[0]);
177 return (WRDE_NOSPACE); /* XXX */
178 }
179
180 if (waitpid(pid, &status, 0) < 0 || !WIFEXITED(status) ||
181 WEXITSTATUS(status) != 0) {
182 close(pdes[0]);
183 return (flags & WRDE_UNDEF ? WRDE_BADVAL : WRDE_SYNTAX);
184 }
185 close(pdes[0]);
186
187 /*
188 * Break the null-terminated expanded word strings out into
189 * the vector.
190 */
191 if (vofs == 0 && flags & WRDE_DOOFS)
192 while (vofs < we->we_offs)
193 we->we_wordv[vofs++] = NULL;
194 p = we->we_strings + sofs;
195 while (nwords-- != 0) {
196 we->we_wordv[vofs++] = p;
197 if ((np = memchr(p, '\0', nbytes)) == NULL)
198 return (WRDE_NOSPACE); /* XXX */
199 nbytes -= np - p + 1;
200 p = np + 1;
201 }
202 we->we_wordv[vofs] = NULL;
203
204 return (0);
205}
206
207/*
208 * we_check --
209 * Check that the string contains none of the following unquoted
210 * special characters: <newline> |&;<>(){}
211 * or command substitutions when WRDE_NOCMD is set in flags.
212 */
|