fix rejection of dns responses with pointers past 512 byte offset
[musl] / src / passwd / getpwent_a.c
1 #include "pwf.h"
2 #include <pthread.h>
3
4 static unsigned atou(char **s)
5 {
6         unsigned x;
7         for (x=0; **s-'0'<10U; ++*s) x=10*x+(**s-'0');
8         return x;
9 }
10
11 int __getpwent_a(FILE *f, struct passwd *pw, char **line, size_t *size, struct passwd **res)
12 {
13         ssize_t l;
14         char *s;
15         int rv = 0;
16         int cs;
17         pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
18         for (;;) {
19                 if ((l=getline(line, size, f)) < 0) {
20                         rv = ferror(f) ? errno : 0;
21                         free(*line);
22                         *line = 0;
23                         pw = 0;
24                         break;
25                 }
26                 line[0][l-1] = 0;
27
28                 s = line[0];
29                 pw->pw_name = s++;
30                 if (!(s = strchr(s, ':'))) continue;
31
32                 *s++ = 0; pw->pw_passwd = s;
33                 if (!(s = strchr(s, ':'))) continue;
34
35                 *s++ = 0; pw->pw_uid = atou(&s);
36                 if (*s != ':') continue;
37
38                 *s++ = 0; pw->pw_gid = atou(&s);
39                 if (*s != ':') continue;
40
41                 *s++ = 0; pw->pw_gecos = s;
42                 if (!(s = strchr(s, ':'))) continue;
43
44                 *s++ = 0; pw->pw_dir = s;
45                 if (!(s = strchr(s, ':'))) continue;
46
47                 *s++ = 0; pw->pw_shell = s;
48                 break;
49         }
50         pthread_setcancelstate(cs, 0);
51         *res = pw;
52         if (rv) errno = rv;
53         return rv;
54 }