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add option --dev to bind to a specific interface

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This commit is contained in:
wangyu-
2018-07-18 02:02:30 -05:00
parent 736c3f46b6
commit fef76af3a5
4 changed files with 42 additions and 14 deletions
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24
network.cpp
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@@ -28,6 +28,8 @@ int lower_level_manual=0;
int ifindex=-1;
char if_name[100]="";
char dev[100]="";
unsigned short g_ip_id_counter=0;
unsigned char dest_hw_addr[sizeof(sockaddr_ll::sll_addr)]=
@@ -235,6 +237,24 @@ int init_raw_socket()
//perror("");
myexit(1);
}
if(strlen(dev)!=0)
{
struct sockaddr_ll bind_address;
memset(&bind_address, 0, sizeof(bind_address));
int index=-1;
assert(init_ifindex(dev,raw_recv_fd,index)==0);
bind_address.sll_family = AF_PACKET;
bind_address.sll_protocol = htons(ETH_P_ALL);
bind_address.sll_ifindex = index;
if(bind(raw_recv_fd, (struct sockaddr *)&bind_address, sizeof(bind_address))==-1)
{
mylog(log_fatal,"bind to dev [%s] failed\n",dev);
myexit(1);
}
}
if(force_socket_buf)
{
@@ -319,7 +339,7 @@ void remove_filter()
//exit(-1);
}
}
int init_ifindex(const char * if_name,int &index)
int init_ifindex(const char * if_name,int fd,int &index)
{
struct ifreq ifr;
size_t if_name_len=strlen(if_name);
@@ -330,7 +350,7 @@ int init_ifindex(const char * if_name,int &index)
mylog(log_fatal,"interface name is too long\n");
myexit(-1);
}
if (ioctl(raw_send_fd,SIOCGIFINDEX,&ifr)==-1) {
if (ioctl(fd,SIOCGIFINDEX,&ifr)==-1) {
mylog(log_fatal,"SIOCGIFINDEX fail ,%s\n",strerror(errno));
myexit(-1);