で動作しません。 Pleasesetsockopt()システムを使用したデバイスバインドのrawソケットはFedora Core 6(2.6.18-1.2798.fc6)
以下のサンプルコードでは、raw sockとeth0をバインドしました。プログラムを実行中に raw sockのrecvfromは、同じマシン(xx_86)のeth0 & eth1からのパケットを受信しています。 なぜ、この問題について私が助けてくれるのかはわかりません。 Fedoraのコア6(2.6.18-1.2798.fc6)
SAMPEコード:Linuxのmanページで
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <linux/if_ether.h>
#include <net/if.h>
#include <linux/filter.h>
#include <sys/ioctl.h>
#include <string.h>
#include <arpa/inet.h>
int main(int argc, char **argv) {
int sock, i;
unsigned char buffer[2048];
unsigned char tbuff[2048];
unsigned char *iphead, *ethhead,*phead;
struct ifreq ethreq;
// NOTE: use TCPDUMP to build the filter array.
// set filter to sniff only port 443
// $ sudo tcpdump -dd port 443
// raw for recvfrom eth0
if ((sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_IP))) == -1) {
perror("socket");
exit(1);
}
// set network card to promiscuos
strncpy(ethreq.ifr_name, "eth0", IFNAMSIZ);
if (ioctl(sock,SIOCGIFFLAGS, ðreq) == -1) {
perror("ioctl");
close(sock);
exit(1);
}
ethreq.ifr_flags |= IFF_PROMISC;
if (ioctl(sock, SIOCSIFFLAGS, ðreq) == -1) {
perror("ioctl");
close(sock);
exit(1);
}
//bind to sock with eth0
struct ifreq Interface;
memset(&Interface, 0, sizeof(Interface));
strncpy(Interface.ifr_ifrn.ifrn_name, "eth0", IFNAMSIZ);
if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, &Interface, sizeof(Interface)) < 0) { close(sock); }
//open the RAW socket for sendto
int s = socket (PF_INET, SOCK_RAW, IPPROTO_RAW);
struct sockaddr_in sin;
memset(&sin,0,sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = htons(0);
sin.sin_addr.s_addr = inet_addr ("10.3.161.104");
// inform kernal don't fill IP and Transport header
int one = 1;
const int *val = &one;
if (setsockopt (s, IPPROTO_IP, IP_HDRINCL, val, sizeof (one)) < 0)
printf ("Warning: Cannot set HDRINCL!\n");
//bind the sock descriptor with eth0
struct ifreq Interface1;
memset(&Interface1, 0, sizeof(Interface1));
strncpy(Interface1.ifr_ifrn.ifrn_name, "eth0", IFNAMSIZ);
if (setsockopt(s, SOL_SOCKET, SO_BINDTODEVICE, &Interface1, sizeof(Interface1)) < 0) { close(s); }
while (1) {
printf("----------------------\n");
i = recvfrom(sock, buffer, sizeof(buffer), 0, NULL, NULL);
printf("%d bytes read\n", i);
// check header size: Ethernet = 14, IP = 20, TCP = 8 (sum = 42)
if (i < 42) {
perror("recvfrom():");
printf("Incomplete packet (errno is %d)\n", errno);
close(sock);
exit(0);
}
phead = buffer + 14; // (skip ethernet header)
memcpy(tbuff,phead,i-14);
iphead=tbuff;
if (*iphead == 0x45) {
int ptrindex= iphead[9];
switch(ptrindex){
case 1:
printf("The transport protocl is:ICMP\n");
break;
case 2:
printf("The transport protol is:IGMP\n");
break;
case 6:
printf("The transport protocol is:TCP\n");
break;
case 17:
printf("The transport protocol is:UDP\n");
break;
case 103:
printf("The transport protocol is:PIM\n");
break;
default:
printf("The transport protocol is:%d\n",iphead[9]);
}
//printf("%d",*ptrindex);
// printf("\n The transport protocol is :%u\n",iphead[9]);
printf("Source Address: %d.%d.%d.%d, Port: %d\n",
iphead[12], iphead[13], iphead[14], iphead[15], (iphead[20] << 8) + iphead[21]);
printf("Dest Address: %d.%d.%d.%d, Port: %d\n",
iphead[16], iphead[17], iphead[18], iphead[19], (iphead[22] << 8) + iphead[23]);
if(sendto(s,tbuff,i-14,0,(struct sockaddr *)&sin,sizeof(sin))<0)
printf("error\n");
else{printf("\nThe received packet is send\n");}
memset(buffer,0,sizeof(buffer));
memset(tbuff,0,sizeof(tbuff));
}
else{ printf("The non ip had received");}
}
close(sock);
}
あなたは 'setsockopt()'エラーで 'perror()'を持っていませんか? – ninjalj