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use csum_with_header in recv_raw_udp

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wangyu- 2018-07-22 03:23:53 -05:00
parent 256d1eee69
commit 52d540df90
3 changed files with 20 additions and 13 deletions
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1
misc.cpp
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@ -74,6 +74,7 @@ int iptables_rule_keep_index=0;
program_mode_t program_mode=unset_mode;//0 unset; 1client 2server
raw_mode_t raw_mode=mode_faketcp;
ip_version_t ip_version=version_unset;
unordered_map<int, const char*> raw_mode_tostring = {{mode_faketcp, "faketcp"}, {mode_udp, "udp"}, {mode_icmp, "icmp"}};
int about_to_exit=0;

2
misc.h
View File

@ -65,6 +65,7 @@ enum server_current_state_t {server_idle=0,server_handshake1,server_ready}; //s
enum client_current_state_t {client_idle=0,client_tcp_handshake,client_handshake1,client_handshake2,client_ready};//client state machine
enum raw_mode_t{mode_faketcp=0,mode_udp,mode_icmp,mode_end};
enum ip_version_t{version_unset=0,version_ipv4,version_ipv6,version_end};
enum program_mode_t {unset_mode=0,client_mode,server_mode};
union current_state_t
@ -110,6 +111,7 @@ extern char fifo_file[1000];
extern raw_mode_t raw_mode;
extern ip_version_t ip_version;
extern program_mode_t program_mode;
extern unordered_map<int, const char*> raw_mode_tostring ;

30
network.cpp
View File

@ -222,6 +222,9 @@ int init_raw_socket()
}
int opt = 0;
assert(setsockopt(raw_send_fd, SOL_SOCKET, SO_RCVBUF, &opt, sizeof(opt))==0);// raw_send_fd is for send only, set its recv buffer to zero
if(force_socket_buf)
{
if(setsockopt(raw_send_fd, SOL_SOCKET, SO_SNDBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
@ -909,11 +912,11 @@ int send_raw_udp(raw_info_t &raw_info, const char * payload, int payloadlen)
char send_raw_udp_buf[buf_len];
udphdr *udph=(struct udphdr *) (send_raw_udp_buf
+ sizeof(struct pseudo_header));
udphdr *udph=(struct udphdr *) (send_raw_udp_buf);
memset(udph,0,sizeof(udphdr));
struct pseudo_header *psh = (struct pseudo_header *) (send_raw_udp_buf);
struct pseudo_header tmp_header={0};
struct pseudo_header *psh = &tmp_header;
udph->source = htons(send_info.src_port);
udph->dest = htons(send_info.dst_port);
@ -928,7 +931,7 @@ int send_raw_udp(raw_info_t &raw_info, const char * payload, int payloadlen)
mylog(log_trace,"udp_len:%d %d\n",udp_tot_len,udph->len);
udph->len=htons(uint16_t(udp_tot_len));
memcpy(send_raw_udp_buf+sizeof(struct pseudo_header)+sizeof(udphdr),payload,payloadlen);
memcpy(send_raw_udp_buf+sizeof(udphdr),payload,payloadlen);
psh->source_address = send_info.src_ip;
psh->dest_address = send_info.dst_ip;
@ -936,11 +939,11 @@ int send_raw_udp(raw_info_t &raw_info, const char * payload, int payloadlen)
psh->protocol = IPPROTO_UDP;
psh->tcp_length = htons(uint16_t(udp_tot_len));
int csum_size = sizeof(struct pseudo_header) +udp_tot_len ;
int csum_size = udp_tot_len ;
udph->check = csum( (unsigned short*) send_raw_udp_buf, csum_size);
udph->check = csum_with_header((char *)psh,sizeof(pseudo_header), (unsigned short*) send_raw_udp_buf, csum_size);
if(send_raw_ip(raw_info,send_raw_udp_buf+ sizeof(struct pseudo_header),udp_tot_len)!=0)
if(send_raw_ip(raw_info,send_raw_udp_buf,udp_tot_len)!=0)
{
return -1;
}
@ -1316,7 +1319,7 @@ int recv_raw_udp(raw_info_t &raw_info, char *&payload, int &payloadlen)
{
const packet_info_t &send_info=raw_info.send_info;
packet_info_t &recv_info=raw_info.recv_info;
static char recv_raw_udp_buf[buf_len];
//static char recv_raw_udp_buf[buf_len];
char * ip_payload;
int ip_payloadlen;
@ -1350,9 +1353,10 @@ int recv_raw_udp(raw_info_t &raw_info, char *&payload, int &payloadlen)
return -1;
}
memcpy(recv_raw_udp_buf+ sizeof(struct pseudo_header) , ip_payload , ip_payloadlen);
//memcpy(recv_raw_udp_buf+ sizeof(struct pseudo_header) , ip_payload , ip_payloadlen);
struct pseudo_header *psh=(pseudo_header *)recv_raw_udp_buf ;
pseudo_header tmp_header={0};
struct pseudo_header *psh=&tmp_header ;
psh->source_address = recv_info.src_ip;
psh->dest_address = recv_info.dst_ip;
@ -1360,8 +1364,8 @@ int recv_raw_udp(raw_info_t &raw_info, char *&payload, int &payloadlen)
psh->protocol = IPPROTO_UDP;
psh->tcp_length = htons(ip_payloadlen);
int csum_len=sizeof(struct pseudo_header)+ip_payloadlen;
uint16_t udp_chk = csum( (unsigned short*) recv_raw_udp_buf, csum_len);
int csum_len=ip_payloadlen;
uint16_t udp_chk = csum_with_header((char *)psh,sizeof(pseudo_header), (unsigned short*) ip_payload, csum_len);
if(udp_chk!=0)
{
@ -1371,7 +1375,7 @@ int recv_raw_udp(raw_info_t &raw_info, char *&payload, int &payloadlen)
}
char *udp_begin=recv_raw_udp_buf+sizeof(struct pseudo_header);
char *udp_begin=ip_payload;
recv_info.src_port=ntohs(udph->source);
recv_info.dst_port=ntohs(udph->dest);