static int mangle_http_header(const struct sk_buff *skb, int flags)
{
struct iphdr *iph = (skb)->nh.iph;
struct tcphdr *tcph = (void *)iph + iph->ihl*4;
unsigned char *data = (void *)tcph + tcph->doff*4;
unsigned int datalen = (skb)->len - (iph->ihl*4) - (tcph->doff*4);
int found, offset, len;
int ret = 0;
SPARQ_LOG("%s: seq=%u\n", __FUNCTION__, ntohl(tcph->seq));
/* Basic checking, is it HTTP packet? */
if (datalen < 10)
return ret; /* Not enough length, ignore it */
if (memcmp(data, "GET ", sizeof("GET ") - 1) != 0 &&
memcmp(data, "POST ", sizeof("POST ") - 1) != 0 &&
memcmp(data, "HEAD ", sizeof("HEAD ") - 1) != 0) //zg add 2006.09.28 for cdrouter3.3 item 186(cdrouter_urlfilter_15)
return ret; /* Pass it */
/* COOKIE modification */
if (flags & HTTP_COOKIE) {
found = find_pattern2(data, datalen, "Cookie: ",
sizeof("Cookie: ")-1, '\r', &offset, &len);
if (found) {
char c;
offset -= (sizeof("Cookie: ") - 1);
/* Swap the 2rd and 4th bit */
c = *(data + offset + 2) ;
*(data + offset + 2) = *(data + offset + 4) ;
*(data + offset + 4) = c ;
ret++;
}
}
return ret;
}
static int get_http_info(const struct sk_buff *skb, int flags, httpinfo_t *info)
{
struct iphdr *iph = ip_hdr(skb);
struct tcphdr *tcph = (void *)iph + iph->ihl*4;
unsigned char *data = (void *)tcph + tcph->doff*4;
unsigned int datalen = (skb)->len - (iph->ihl*4) - (tcph->doff*4);
int found, offset;
int hostlen, pathlen;
int ret = 0;
SPARQ_LOG("%s: seq=%u\n", __FUNCTION__, ntohl(tcph->seq));
/* Basic checking, is it HTTP packet? */
if (datalen < 10)
return ret; /* Not enough length, ignore it */
if (memcmp(data, "GET ", sizeof("GET ") - 1) != 0 &&
memcmp(data, "POST ", sizeof("POST ") - 1) != 0)
return ret; /* Pass it */
if (!(flags & (HTTP_HOST | HTTP_URL)))
return ret;
/* find the 'Host: ' value */
found = find_pattern2(data, datalen, "Host: ",
sizeof("Host: ") - 1, '\r', &offset, &hostlen);
SPARQ_LOG("Host found=%d\n", found);
if (!found || !hostlen)
return ret;
ret++; /* Host found, increase the return value */
hostlen = (hostlen < BUFSIZE) ? hostlen : BUFSIZE;
strncpy(info->host, data + offset, hostlen);
*(info->host + hostlen) = 0; /* null-terminated */
info->hostlen = hostlen;
SPARQ_LOG("HOST=%s, hostlen=%d\n", info->host, info->hostlen);
if (!(flags & HTTP_URL))
return ret;
/* find the 'GET ' or 'POST ' value */
found = find_pattern2(data, datalen, "GET ",
sizeof("GET ") - 1, '\r', &offset, &pathlen);
if (!found)
found = find_pattern2(data, datalen, "POST ",
sizeof("POST ") - 1, '\r', &offset, &pathlen);
SPARQ_LOG("GET/POST found=%d\n", found);
if (!found || (pathlen -= (sizeof(" HTTP/x.x") - 1)) <= 0)/* ignor this field */
return ret;
ret++; /* GET/POST found, increase the return value */
pathlen = ((pathlen + hostlen) < BUFSIZE) ? pathlen : BUFSIZE - hostlen;
strncpy(info->url, info->host, hostlen);
strncpy(info->url + hostlen, data + offset, pathlen);
*(info->url + hostlen + pathlen) = 0; /* null-terminated */
info->urllen = hostlen + pathlen;
SPARQ_LOG("URL=%s, urllen=%d\n", info->url, info->urllen);
return ret;
}