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Handle Host header after User-Agent header in the HTTP packet. Fixes #29.

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Most browsers would put Host header as early as they could, but not Microsoft Edge.
This commit is contained in:
ValdikSS 2017-08-28 11:45:05 +03:00
parent ee665ee3bd
commit 4c13435ee3
1 changed files with 25 additions and 12 deletions
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37
goodbyedpi.c
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@ -352,27 +352,40 @@ int main(int argc, char *argv[]) {
*/ */
host_len = data_addr_rn - host_addr; host_len = data_addr_rn - host_addr;
useragent_addr = find_useragent_header(packet_data, packet_dataLen); useragent_addr = find_useragent_header(packet_data, packet_dataLen);
if (host_len <= 253 && useragent_addr && useragent_addr > host_addr) { if (host_len <= 253 && useragent_addr) {
/* Performing action only if User-Agent header goes after Host */
useragent_addr += strlen(http_useragent_find); useragent_addr += strlen(http_useragent_find);
/* useragent_addr is in the beginning of User-Agent value */ /* useragent_addr is in the beginning of User-Agent value */
data_len = packet_dataLen - ((PVOID)useragent_addr - packet_data); data_len = packet_dataLen - ((PVOID)useragent_addr - packet_data);
data_addr_rn = dumb_memmem(useragent_addr, data_addr_rn = dumb_memmem(useragent_addr,
data_len, "\r\n", 2); data_len, "\r\n", 2);
/* data_addr_rn is in the end of User-Agent value */ /* data_addr_rn is in the end of User-Agent value */
if (data_addr_rn) { if (data_addr_rn) {
data_len = (PVOID)data_addr_rn - (PVOID)host_addr; if (useragent_addr > host_addr) {
/* User-Agent goes AFTER Host header */
data_len = (PVOID)data_addr_rn - (PVOID)host_addr;
/* Move one byte to the left from "Host:" /* Move one byte to the LEFT from "Host:"
* to the end of User-Agen * to the end of User-Agent
*/ */
memmove(host_addr - 1, host_addr, data_len); memmove(host_addr - 1, host_addr, data_len);
/* Put space in the end of User-Agent header */ /* Put space in the end of User-Agent header */
*(char*)(data_addr_rn - 1) = ' '; *(char*)(data_addr_rn - 1) = ' ';
//printf("Replaced Host header!\n"); //printf("Replaced Host header!\n");
}
else {
/* User-Agent goes BEFORE Host header */
data_len = (PVOID)host_addr - (PVOID)data_addr_rn - 1;
/* Move one byte to the RIGHT from the end of User-Agent
* to the "Host:"
*/
memmove(data_addr_rn + 1, data_addr_rn, data_len);
/* Put space in the end of User-Agent header */
*(char*)(data_addr_rn) = ' ';
//printf("Replaced Host header!\n");
}
} }
} }
} }