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add read_udp_header()

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This commit is contained in:
hugoc 2023-11-29 01:13:01 +01:00
parent 9f4cd23973
commit 560613256a
1 changed files with 45 additions and 0 deletions
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45
src/core.c
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@ -600,6 +600,51 @@ static int write_udp_header(socks5_addr dst_addr, unsigned short dst_port , char
return buf_iter;
}
int read_udp_header(char * buf, size_t buflen, socks5_addr* src_addr, unsigned short* src_port, char* frag) {
if (buflen < 5){
PDEBUG("buffer too short to contain a UDP header\n");
return -1;
}
int buf_iter = 0;
buf_iter += 2; // first 2 bytes are reserved;
*frag = buf[buf_iter++];
src_addr->atyp = buf[buf_iter++];
switch (src_addr->atyp)
{
case ATYP_DOM:
src_addr->addr.dom.len = buf[buf_iter++];
if(buflen < 5 + 2 + src_addr->addr.dom.len ) {
PDEBUG("buffer too short to read the UDP header\n");
return -1;
}
memcpy(src_addr->addr.dom.name, buf + buf_iter, src_addr->addr.dom.len);
buf_iter += src_addr->addr.dom.len;
break;
case ATYP_V4:
case ATYP_V6:
int v6 = src_addr->atyp == ATYP_V6;
if(buflen < 4 + 2 + v6?16:4 ){
PDEBUG("buffer too short to read the UDP header\n");
return -1;
}
memcpy(src_addr->addr.v6, buf + buf_iter, v6?16:4);
buf_iter += v6?16:4;
break;
default:
break;
}
memcpy(src_port, buf+buf_iter, 2);
buf_iter += 2;
return buf_iter;
}
int send_udp_packet(int sockfd, udp_relay_chain chain, ip_type target_ip, unsigned short target_port, char frag, char * data, unsigned int data_len) {
if (chain.head == NULL ){