多路径udp连接
我编写了客户端和服务器代码。客户端和服务器都有两个接口和两个独立的IP地址。为了检查结果，我做了两个tap环回。
然后，我检查服务器和客户端。似乎客户端通过两个套接字发送数据包，但服务器只接收来自一个套接字的数据包。
您能否指导一下我的代码或loopbaks的问题是什么？
客户端
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <string.h>
#include <iostream>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/socket.h>
#define BUFLEN 2048
#define MSGS 5 /* number of messages to send */
int main(void)
{
struct sockaddr_in myaddr, remaddr;
int fd, i, slen=sizeof(remaddr);
char buf[BUFLEN]; /* message buffer */
int recvlen; /* # bytes in acknowledgement message */
char *server = "192.168.10.10"; /* change this to use a different server */
//////////////////////////////////
struct sockaddr_in myaddr2, remaddr2;
int fd2, slen2=sizeof(remaddr2);
char buf2[BUFLEN]; /* message buffer */
int recvlen2; /* # bytes in acknowledgement message */
char *server2 = "192.168.11.11"; /* change this to use a different server */
//////////////////////////////
/* create a socket */
if ((fd=socket(AF_INET, SOCK_DGRAM, 0))==-1)
printf("socket created\n");
/////////////////////////////
if ((fd2=socket(AF_INET, SOCK_DGRAM, 0))==-1)
printf("socket2 created\n");
/////////////////////////////
/* bind fd and fd2 */
memset((char *)&myaddr, 0, sizeof(myaddr));
myaddr.sin_family = AF_INET;
//myaddr.sin_addr.s_addr = htonl(INADDR_ANY);
inet_pton(AF_INET, "192.168.10.10", &myaddr.sin_addr.s_addr);
myaddr.sin_port = htons(2000);
/////////////////////////////
memset((char *)&myaddr2, 0, sizeof(myaddr2));
myaddr2.sin_family = AF_INET;
//myaddr.sin_addr.s_addr = htonl(INADDR_ANY);
inet_pton(AF_INET, "192.168.11.11", &myaddr2.sin_addr.s_addr);
myaddr2.sin_port = htons(2001);
/////////////////////////////
if (bind(fd, (struct sockaddr *)&myaddr, sizeof(myaddr)) < 0) {
perror("bind failed");
return 0;
}
/////////////////////////////
if (bind(fd2, (struct sockaddr *)&myaddr2, sizeof(myaddr2)) < 0) {
perror("bind2 failed");
return 0;
}
/////////////////////////////
// printf("binding ip %s to port %d\n", myaddr.sin_addr.s_addr, myaddr.sin_port);
/* now define remaddr, the address to whom we want to send messages */
/* For convenience, the host address is expressed as a numeric IP address */
/* that we will convert to a binary format via inet_aton */
memset((char *) &remaddr, 0, sizeof(remaddr));
remaddr.sin_family = AF_INET;
remaddr.sin_port = htons(3000);
if (inet_aton(server, &remaddr.sin_addr)==0) {
fprintf(stderr, "inet_aton() failed\n");
exit(1);
}
/////////////////////////////
memset((char *) &remaddr2, 0, sizeof(remaddr2));
remaddr2.sin_family = AF_INET;
remaddr2.sin_port = htons(4000);
if (inet_aton(server2, &remaddr2.sin_addr)==0) {
fprintf(stderr, "inet_aton2() failed\n");
exit(1);
}
/////////////////////////////
/* now let's send the messages */
for (i=0; i < MSGS; i++) {
printf("Sending packet %d to %s port %d\n", i, server, remaddr.sin_port);
sprintf(buf, "This is packet %d", i);
if (sendto(fd, buf, strlen(buf), 0, (struct sockaddr *)&remaddr, slen)==-1) {
perror("sendto");
exit(1);
}
printf("socket %i SENT A PACKET \n", fd);
printf("Sending packet %d to %s port %d\n", i, server2, remaddr2.sin_port);
sprintf(buf2, "This is packet %d", i);
if (sendto(fd2, buf2, strlen(buf2), 0, (struct sockaddr *)&remaddr2, slen2)==-1) {
perror("sendto2");
exit(1);
}
printf("socket %i SENT A PACKET \n", fd2);
}
close(fd);
close(fd2);
return 0;
}
服务器
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <string.h>
#include <errno.h>
#include <iostream>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/select.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <netdb.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#define BUFSIZE 2048
int
main(int argc, char **argv)
{
int n;
fd_set readfds;
struct timeval tv;
struct sockaddr_in myaddr; /* our address */
struct sockaddr_in remaddr; /* remote address */
socklen_t addrlen = sizeof(remaddr); /* length of addresses */
int recvlen; /* # bytes received */
int fd; /* our socket */
unsigned char buf[BUFSIZE]; /* receive buffer */
/////////////////////
struct sockaddr_in myaddr2; /* our address */
struct sockaddr_in remaddr2; /* remote address */
socklen_t addrlen2 = sizeof(remaddr2); /* length of addresses */
int recvlen2; /* # bytes received */
int fd2; /* our socket */
unsigned char buf2[BUFSIZE]; /* receive buffer */
/////////////////////
/* create a UDP socket */
if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
perror("cannot create socket\n");
return 0;
}
printf("socket %i is open \n", fd);
///////////////////////////////
if ((fd2 = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
perror("cannot create socket2\n");
return 0;
}
printf("socket %i is open \n", fd2);
///////////////////////////////
// clear the set ahead of time
FD_ZERO(&readfds);
// add our descriptors to the set
FD_SET(fd, &readfds);
FD_SET(fd2, &readfds);
// since we got s2 second, it's the "greater", so we use that for
// the n param in select()
n = fd2 + 1;
/* bind the socket to any valid IP address and a specific port */
memset((char *)&myaddr, 0, sizeof(myaddr));
myaddr.sin_family = AF_INET;
//myaddr.sin_addr.s_addr = htonl(INADDR_ANY);
inet_pton(AF_INET, "192.168.10.10", &myaddr.sin_addr.s_addr);
myaddr.sin_port = htons(3000);
if (bind(fd, (struct sockaddr *)&myaddr, sizeof(myaddr)) < 0) {
perror("bind failed");
return 0;
}
///////////////////////////
memset((char *)&myaddr2, 0, sizeof(myaddr2));
myaddr2.sin_family = AF_INET;
//myaddr2.sin_addr.s_addr = htonl(INADDR_ANY);
inet_pton(AF_INET, "192.168.11.11", &myaddr2.sin_addr.s_addr);
myaddr2.sin_port = htons(4000);
if (bind(fd2, (struct sockaddr *)&myaddr2, sizeof(myaddr2)) < 0) {
perror("bind2 failed");
return 0;
}
// wait until either socket has data ready to be recv()d (timeout 10.5 secs)
tv.tv_sec = 50;
tv.tv_usec = 500000;
for (;;) {
int rv = select(n, &readfds, NULL, NULL, &tv);
if (rv == -1) {
perror("select"); // error occurred in select()
} else if (rv == 0) {
printf("Timeout occurred! No data after 10.5 seconds.\n");
} else {
// one or both of the descriptors have data
if (FD_ISSET(fd, &readfds)) {
printf("socket %i RECEIVED A PACKET \n", fd);
printf("waiting on port %d\n", myaddr.sin_port);
recvlen = recvfrom(fd, buf, BUFSIZE, 0, (struct sockaddr *)&remaddr, &addrlen);
if (recvlen > 0) {
buf[recvlen] = 0;
printf("received message: \"%s\" (%d bytes)\n", buf, recvlen);
}
else
printf("uh oh - something went wrong!\n");
//sprintf(buf, "ack %d", msgcnt++);
}
if (FD_ISSET(fd2, &readfds)) {
printf("socket %i RECEIVED A PACKET \n", fd2);
printf("waiting on port %d\n", myaddr2.sin_port);
recvlen2 = recvfrom(fd2, buf2, BUFSIZE, 0, (struct sockaddr *)&remaddr2, &addrlen2);
if (recvlen2 > 0) {
buf[recvlen2] = 0;
printf("received message2: \"%s\" (%d bytes)\n", buf2, recvlen2);
}
else
printf("uh oh - something went wrong2!\n");
//sprintf(buf, "ack %d", msgcnt++);
}
}
}
}
结果显示在图片中：
===== 现在我检查了ns3模拟器网络中的程序。它工作正常。所以似乎问题在于环回。请指导我如何进行环回并通过localhost进行测试。
0 个答案:
没有答案
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