int getspnam_r(const char *name, struct spwd *sp, char *buf, size_t size, struct spwd **res)
{
char path[20+NAME_MAX];
FILE *f = 0;
int rv = 0;
int fd;
size_t k, l = strlen(name);
int skip = 0;
int cs;
*res = 0;
/* Disallow potentially-malicious user names */
if (*name=='.' || strchr(name, '/') || !l)
return EINVAL;
/* Buffer size must at least be able to hold name, plus some.. */
if (size < l+100) return ERANGE;
/* Protect against truncation */
if (snprintf(path, sizeof path, "/etc/tcb/%s/shadow", name) >= sizeof path)
return EINVAL;
fd = open(path, O_RDONLY|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC);
if (fd >= 0) {
struct stat st = { 0 };
errno = EINVAL;
if (fstat(fd, &st) || !S_ISREG(st.st_mode) || !(f = fdopen(fd, "rb"))) {
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
close(fd);
pthread_setcancelstate(cs, 0);
return errno;
}
} else {
f = fopen("/etc/shadow", "rbe");
if (!f) return errno;
}
pthread_cleanup_push(cleanup, f);
while (fgets(buf, size, f) && (k=strlen(buf))>0) {
if (skip || strncmp(name, buf, l)) {
skip = buf[k-1] != '\n';
continue;
}
if (buf[k-1] != '\n') {
rv = ERANGE;
break;
}
if (__parsespent(buf, sp) < 0) continue;
*res = sp;
break;
}
pthread_cleanup_pop(1);
return rv;
}
struct spwd* fgetspent(FILE* f) {
static char* line;
static struct spwd sp;
size_t size = 0;
struct spwd* res = 0;
int cs;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
if (getline(&line, &size, f) >= 0 && __parsespent(line, &sp) >= 0)
res = &sp;
pthread_setcancelstate(cs, 0);
return res;
}