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fix __ipparse to parse the generic numbers-and-dots IPv4 format correctly

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* allow at most 4 parts
* bounds check the parts correctly
* disallow leading whitespace and sign
* check the address family before falling back to IPv6
This commit is contained in:
Szabolcs Nagy 2013-10-22 12:28:17 +00:00
parent 59b8dc08f7
commit 51c4e451db
1 changed files with 12 additions and 5 deletions
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17
src/network/__ipparse.c
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@ -1,27 +1,31 @@
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "__dns.h"
#include <stdio.h>
int __ipparse(void *dest, int family, const char *s0)
{
const char *s = s0;
unsigned char *d = dest;
unsigned long a[16] = { 0 };
const char *z;
char *z;
int i;
if (family == AF_INET6) goto not_v4;
for (i=0; i<4; i++) {
a[i] = strtoul(s, (char **)&z, 0);
if (z==s || (*z && *z != '.')) goto not_v4;
a[i] = strtoul(s, &z, 0);
if (z==s || (*z && *z != '.') || !isdigit(*s)) {
if (family == AF_INET) return -1;
goto not_v4;
}
if (!*z) break;
s=z+1;
}
if (i==4) return -1;
switch (i) {
case 0:
a[1] = a[0] & 0xffffff;
@ -35,7 +39,10 @@ int __ipparse(void *dest, int family, const char *s0)
}
((struct sockaddr_in *)d)->sin_family = AF_INET;
d = (void *)&((struct sockaddr_in *)d)->sin_addr;
for (i=0; i<4; i++) d[i] = a[i];
for (i=0; i<4; i++) {
if (a[i] > 255) return -1;
d[i] = a[i];
}
return 0;
not_v4: