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Code cleanup

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This commit is contained in:
Vadim Vetrov 2024-08-07 00:22:52 +03:00
parent 7ef3290f41
commit 1b8d3a0e66
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GPG Key ID: E8A308689D7A73A5
2 changed files with 19 additions and 32 deletions
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3
config.h
View File

@ -54,3 +54,6 @@
#define DEBUG #define DEBUG
#endif #endif
// The Maximum Transmission Unit size for rawsocket
// Larger packets will be fragmented. Applicable for Chrome's kyber.
#define AVAILABLE_MTU 1384

48
youtubeUnblock.c
View File

@ -110,14 +110,6 @@ static int open_raw_socket(void) {
return -1; return -1;
} }
// int one = 1;
// const int *val = &one;
// if (setsockopt(config.rawsocket, IPPROTO_IP, IP_HDRINCL, val, sizeof(one)) < 0)
// {
// fprintf(stderr, "setsockopt(IP_HDRINCL, 1) failed\n");
// return -1;
// }
int mark = RAWSOCKET_MARK; int mark = RAWSOCKET_MARK;
if (setsockopt(config.rawsocket, SOL_SOCKET, SO_MARK, &mark, sizeof(mark)) < 0) if (setsockopt(config.rawsocket, SOL_SOCKET, SO_MARK, &mark, sizeof(mark)) < 0)
{ {
@ -157,7 +149,6 @@ static int close_raw_socket(void) {
return 0; return 0;
} }
#define AVAILABLE_MTU 1384
static int send_raw_socket(const uint8_t *pkt, uint32_t pktlen) { static int send_raw_socket(const uint8_t *pkt, uint32_t pktlen) {
int ret; int ret;
@ -252,14 +243,12 @@ struct packet_data {
uint16_t payload_len; uint16_t payload_len;
}; };
// Per-queue data. Passed to queue_cb. // Per-queue data. Passed to queue_cb.
struct queue_data { struct queue_data {
struct mnl_socket **_nl; struct mnl_socket **_nl;
int queue_num; int queue_num;
}; };
/** /**
* Used to accept unsupported packets (GSOs) * Used to accept unsupported packets (GSOs)
*/ */
@ -317,32 +306,27 @@ static int process_packet(const struct packet_data packet, struct queue_data qda
} }
const int family = AF_INET; const int family = AF_INET;
const uint8_t *raw_payload = packet.payload; const uint8_t *raw_payload = packet.payload;
size_t raw_payload_len = packet.payload_len; size_t raw_payload_len = packet.payload_len;
if (raw_payload == NULL) return MNL_CB_ERROR; const struct iphdr *iph;
uint32_t iph_len;
const struct tcphdr *tcph;
uint32_t tcph_len;
const uint8_t *data;
uint32_t dlen;
const struct iphdr *ip_header = (const void *)raw_payload; int ret = tcp4_payload_split((uint8_t *)raw_payload, raw_payload_len,
(struct iphdr **)&iph, &iph_len, (struct tcphdr **)&tcph, &tcph_len,
(uint8_t **)&data, &dlen);
if (ip_header->version != IPPROTO_IPIP || ip_header->protocol != IPPROTO_TCP) if (ret < 0) {
goto fallback;
int iph_len = ip_header->ihl * 4;
const struct tcphdr *tcph = (const void *)(raw_payload + iph_len);
if ((const uint8_t *)tcph + 20 > raw_payload + raw_payload_len) {
goto fallback; goto fallback;
} }
int tcph_len = tcph->doff * 4;
if ((const uint8_t *)tcph + tcph_len > raw_payload + raw_payload_len) {
goto fallback;
}
int data_len = ntohs(ip_header->tot_len) - iph_len - tcph_len; struct verdict vrd = analyze_tls_data(data, dlen);
const uint8_t *data = (const uint8_t *)(raw_payload + iph_len + tcph_len);
struct verdict vrd = analyze_tls_data(data, data_len);
verdnlh = nfq_nlmsg_put(buf, NFQNL_MSG_VERDICT, qdata.queue_num); verdnlh = nfq_nlmsg_put(buf, NFQNL_MSG_VERDICT, qdata.queue_num);
nfq_nlmsg_verdict_put(verdnlh, packet.id, NF_ACCEPT); nfq_nlmsg_verdict_put(verdnlh, packet.id, NF_ACCEPT);
@ -352,7 +336,7 @@ static int process_packet(const struct packet_data packet, struct queue_data qda
printf("Google video!\n"); printf("Google video!\n");
#endif #endif
if (data_len > 1480) { if (dlen > 1480) {
#ifdef DEBUG #ifdef DEBUG
fprintf(stderr, "WARNING! Google video packet is too big and may cause issues!\n"); fprintf(stderr, "WARNING! Google video packet is too big and may cause issues!\n");
#endif #endif
@ -370,12 +354,12 @@ static int process_packet(const struct packet_data packet, struct queue_data qda
nfq_nlmsg_verdict_put(verdnlh, packet.id, NF_DROP); nfq_nlmsg_verdict_put(verdnlh, packet.id, NF_DROP);
int ret = 0; int ret = 0;
nfq_ip_set_checksum((struct iphdr *)ip_header); nfq_ip_set_checksum((struct iphdr *)iph);
nfq_tcp_compute_checksum_ipv4( nfq_tcp_compute_checksum_ipv4(
(struct tcphdr *)tcph, (struct iphdr *)ip_header); (struct tcphdr *)tcph, (struct iphdr *)iph);
#ifdef FAKE_SNI #ifdef FAKE_SNI
ret = gen_fake_sni(ip_header, tcph, fake_sni, &fsn_len); ret = gen_fake_sni(iph, tcph, fake_sni, &fsn_len);
if (ret < 0) { if (ret < 0) {
errno = -ret; errno = -ret;
perror("gen_fake_sni"); perror("gen_fake_sni");