]>
Commit | Line | Data |
---|---|---|
4f5f35fc KZ |
1 | #include <stdlib.h> |
2 | ||
3 | #include "c.h" | |
4 | #include "pwdutils.h" | |
5 | #include "xalloc.h" | |
6 | ||
7 | /* Returns allocated passwd and allocated pwdbuf to store passwd strings | |
8 | * fields. In case of error returns NULL and set errno, for unknown user set | |
9 | * errno to EINVAL | |
10 | */ | |
11 | struct passwd *xgetpwnam(const char *username, char **pwdbuf) | |
12 | { | |
13 | struct passwd *pwd = NULL, *res = NULL; | |
14 | int rc; | |
15 | ||
16 | if (!pwdbuf || !username) | |
17 | return NULL; | |
18 | ||
19 | *pwdbuf = xmalloc(UL_GETPW_BUFSIZ); | |
20 | pwd = xcalloc(1, sizeof(struct passwd)); | |
21 | ||
22 | errno = 0; | |
23 | rc = getpwnam_r(username, pwd, *pwdbuf, UL_GETPW_BUFSIZ, &res); | |
24 | if (rc != 0) { | |
25 | errno = rc; | |
26 | goto failed; | |
27 | } | |
28 | if (!res) { | |
29 | errno = EINVAL; | |
30 | goto failed; | |
31 | } | |
32 | return pwd; | |
33 | failed: | |
34 | free(pwd); | |
35 | free(*pwdbuf); | |
36 | return NULL; | |
37 | } | |
38 | ||
dc96ca29 MHB |
39 | /* Returns allocated group and allocated grpbuf to store group strings |
40 | * fields. In case of error returns NULL and set errno, for unknown group set | |
41 | * errno to EINVAL | |
42 | */ | |
43 | struct group *xgetgrnam(const char *groupname, char **grpbuf) | |
44 | { | |
45 | struct group *grp = NULL, *res = NULL; | |
46 | int rc; | |
47 | ||
48 | if (!grpbuf || !groupname) | |
49 | return NULL; | |
50 | ||
51 | *grpbuf = xmalloc(UL_GETPW_BUFSIZ); | |
52 | grp = xcalloc(1, sizeof(struct group)); | |
53 | ||
54 | errno = 0; | |
55 | rc = getgrnam_r(groupname, grp, *grpbuf, UL_GETPW_BUFSIZ, &res); | |
56 | if (rc != 0) { | |
57 | errno = rc; | |
58 | goto failed; | |
59 | } | |
60 | if (!res) { | |
61 | errno = EINVAL; | |
62 | goto failed; | |
63 | } | |
64 | return grp; | |
65 | failed: | |
66 | free(grp); | |
67 | free(*grpbuf); | |
68 | return NULL; | |
69 | } | |
70 | ||
cd083615 QR |
71 | struct passwd *xgetpwuid(uid_t uid, char **pwdbuf) |
72 | { | |
73 | struct passwd *pwd = NULL, *res = NULL; | |
74 | int rc; | |
75 | ||
76 | if (!pwdbuf) | |
77 | return NULL; | |
78 | ||
79 | *pwdbuf = xmalloc(UL_GETPW_BUFSIZ); | |
80 | pwd = xcalloc(1, sizeof(struct passwd)); | |
81 | ||
82 | errno = 0; | |
83 | rc = getpwuid_r(uid, pwd, *pwdbuf, UL_GETPW_BUFSIZ, &res); | |
84 | if (rc != 0) { | |
85 | errno = rc; | |
86 | goto failed; | |
87 | } | |
88 | if (!res) { | |
89 | errno = EINVAL; | |
90 | goto failed; | |
91 | } | |
92 | return pwd; | |
93 | failed: | |
94 | free(pwd); | |
95 | free(*pwdbuf); | |
96 | return NULL; | |
97 | } | |
98 | ||
1742c8d8 KZ |
99 | char *xgetlogin(void) |
100 | { | |
101 | struct passwd *pw = NULL; | |
102 | uid_t ruid; | |
103 | char *user; | |
104 | ||
105 | user = getlogin(); | |
106 | if (user) | |
107 | return xstrdup(user); | |
108 | ||
109 | /* GNU Hurd implementation has an extension where a process can exist in a | |
110 | * non-conforming environment, and thus be outside the realms of POSIX | |
111 | * process identifiers; on this platform, getuid() fails with a status of | |
112 | * (uid_t)(-1) and sets errno if a program is run from a non-conforming | |
113 | * environment. | |
114 | * | |
115 | * http://austingroupbugs.net/view.php?id=511 | |
116 | */ | |
117 | errno = 0; | |
118 | ruid = getuid(); | |
119 | ||
120 | if (errno == 0) | |
121 | pw = getpwuid(ruid); | |
122 | if (pw && pw->pw_name && *pw->pw_name) | |
123 | return xstrdup(pw->pw_name); | |
124 | ||
125 | return NULL; | |
126 | } | |
4f5f35fc KZ |
127 | |
128 | #ifdef TEST_PROGRAM | |
129 | int main(int argc, char *argv[]) | |
130 | { | |
1742c8d8 | 131 | char *buf = NULL; |
4f5f35fc KZ |
132 | struct passwd *pwd = NULL; |
133 | ||
134 | if (argc != 2) { | |
135 | fprintf(stderr, "usage: %s <username>\n", argv[0]); | |
136 | return EXIT_FAILURE; | |
137 | } | |
138 | ||
1742c8d8 | 139 | pwd = xgetpwnam(argv[1], &buf); |
4f5f35fc KZ |
140 | if (!pwd) |
141 | err(EXIT_FAILURE, "failed to get %s pwd entry", argv[1]); | |
142 | ||
143 | printf("Username: %s\n", pwd->pw_name); | |
144 | printf("UID: %d\n", pwd->pw_uid); | |
145 | printf("HOME: %s\n", pwd->pw_dir); | |
146 | printf("GECO: %s\n", pwd->pw_gecos); | |
147 | ||
148 | free(pwd); | |
1742c8d8 KZ |
149 | free(buf); |
150 | ||
151 | printf("Current: %s\n", (buf = xgetlogin())); | |
152 | free(buf); | |
153 | ||
4f5f35fc KZ |
154 | return EXIT_SUCCESS; |
155 | } | |
156 | #endif /* TEST_PROGRAM */ |