Imported Upstream version 1.8.7
[debian/sudo] / compat / pw_dup.c
1 /*
2  * Copyright (c) 2000, 2002, 2012-2013
3  *      Todd C. Miller <Todd.Miller@courtesan.com>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  *
17  * Sponsored in part by the Defense Advanced Research Projects
18  * Agency (DARPA) and Air Force Research Laboratory, Air Force
19  * Materiel Command, USAF, under agreement number F39502-99-1-0512.
20  */
21
22 #include <config.h>
23
24 #ifndef HAVE_PW_DUP
25
26 #include <sys/types.h>
27
28 #include <stdio.h>
29 #ifdef STDC_HEADERS
30 # include <stdlib.h>
31 # include <stddef.h>
32 #else
33 # ifdef HAVE_STDLIB_H
34 #  include <stdlib.h>
35 # endif
36 #endif /* STDC_HEADERS */
37 #ifdef HAVE_STRING_H
38 # include <string.h>
39 #endif /* HAVE_STRING_H */
40 #ifdef HAVE_STRINGS_H
41 # include <strings.h>
42 #endif /* HAVE_STRINGS_H */
43 #if defined(HAVE_MALLOC_H) && !defined(STDC_HEADERS)
44 # include <malloc.h>
45 #endif /* HAVE_MALLOC_H && !STDC_HEADERS */
46 #include <pwd.h>
47
48 #define PW_SIZE(name, size)                             \
49 do {                                                    \
50         if (pw->name) {                                 \
51                 size = strlen(pw->name) + 1;            \
52                 total += size;                          \
53         }                                               \
54 } while (0)
55
56 #define PW_COPY(name, size)                             \
57 do {                                                    \
58         if (pw->name) {                                 \
59                 (void)memcpy(cp, pw->name, size);       \
60                 newpw->name = cp;                       \
61                 cp += size;                             \
62         }                                               \
63 } while (0)
64
65 struct passwd *
66 pw_dup(const struct passwd *pw)
67 {
68         size_t nsize = 0, psize = 0, gsize = 0, dsize = 0, ssize = 0, total;
69 #ifdef HAVE_LOGIN_CAP_H
70         size_t csize;
71 #endif
72         struct passwd *newpw;
73         char *cp;
74
75         /* Allocate in one big chunk for easy freeing */
76         total = sizeof(struct passwd);
77         PW_SIZE(pw_name, nsize);
78         PW_SIZE(pw_passwd, psize);
79 #ifdef HAVE_LOGIN_CAP_H
80         PW_SIZE(pw_class, csize);
81 #endif
82         PW_SIZE(pw_gecos, gsize);
83         PW_SIZE(pw_dir, dsize);
84         PW_SIZE(pw_shell, ssize);
85
86         if ((cp = malloc(total)) == NULL)
87                 return NULL;
88         newpw = (struct passwd *)cp;
89
90         /*
91          * Copy in passwd contents and make strings relative to space
92          * at the end of the buffer.
93          */
94         (void)memcpy(newpw, pw, sizeof(struct passwd));
95         cp += sizeof(struct passwd);
96
97         PW_COPY(pw_name, nsize);
98         PW_COPY(pw_passwd, psize);
99 #ifdef HAVE_LOGIN_CAP_H
100         PW_COPY(pw_class, csize);
101 #endif
102         PW_COPY(pw_gecos, gsize);
103         PW_COPY(pw_dir, dsize);
104         PW_COPY(pw_shell, ssize);
105
106         return newpw;
107 }
108 #endif /* HAVE_PW_DUP */