#include <stdio.h>
#include <string.h>
#include <errno.h>
+#include <limits.h>
#include "nscd.h"
static const struct {
int32_t req_buf[REQ_LEN] = {
NSCDVERSION,
req,
- strlen(key)+1
+ strnlen(key,LOGIN_NAME_MAX)+1
};
struct msghdr msg = {
.msg_iov = (struct iovec[]){
},
.msg_iovlen = 2
};
-
- if (strlen(key) > INT32_MAX - 1) {
- return (FILE*)-1;
- }
+ int errno_save = errno;
*swap = 0;
retry:
+ memset(buf, 0, len);
+ buf[0] = NSCDVERSION;
fd = socket(PF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
- if (fd < 0) return NULL;
+ if (fd < 0) {
+ if (errno == EAFNOSUPPORT) {
+ f = fopen("/dev/null", "re");
+ if (f)
+ errno = errno_save;
+ return f;
+ }
+ return 0;
+ }
+
+ if(!(f = fdopen(fd, "r"))) {
+ close(fd);
+ return 0;
+ }
+
+ if (req_buf[2] > LOGIN_NAME_MAX)
+ return f;
if (connect(fd, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
- /* If there isn't a running nscd we return -1 to indicate that
- * that is precisely what happened
- */
+ /* If there isn't a running nscd we simulate a "not found"
+ * result and the caller is responsible for calling
+ * fclose on the (unconnected) socket. The value of
+ * errno must be left unchanged in this case. */
if (errno == EACCES || errno == ECONNREFUSED || errno == ENOENT) {
- close(fd);
- return (FILE *)-1;
+ errno = errno_save;
+ return f;
}
goto error;
}
if (sendmsg(fd, &msg, MSG_NOSIGNAL) < 0)
goto error;
- if(!(f = fdopen(fd, "r"))) goto error;
-
if (!fread(buf, len, 1, f)) {
/* If the VERSION entry mismatches nscd will disconnect. The
* most likely cause is that the endianness mismatched. So, we
return f;
error:
- if (f) fclose(f); else close(fd);
+ fclose(f);
return 0;
}