您好我想作一个简单的服务器,在一个IP地址需要从getaddrinfo()和与之结合。使用ifconfig,我发现我有一个我想绑定到的wlan0 192.168.2.10的IP地址。不幸的是,我似乎要约束的地址是我的设备。因为当我初始化的getaddrinfo( “192.168.2.10”, “3490”,& hings,& RES)由于某种原因; res会返回到一个NULL指针。我会炫耀我的代码波纹管。绑定到下Ubuntu的一个特定的IP
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <signal.h>
#define MAXDATASIZE 500;
int main(int argc, char *argv[]){
// dealing with client socket
struct sockaddr_storage their_addr;
socklen_t addr_size;
// server socket
struct addrinfo serverSide,*serverInfo,*sortIP;
int optValRet;
int listenSock, newSock;
// this is for reading in information
char buf[501];
char point[INET6_ADDRSTRLEN];
char compare[INET6_ADDRSTRLEN] = "192.168.2.10";
// this is for handeling child processes and signals
struct sigaction sa;
sa.sa_handler = NULL;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
if(sigaction(SIGCHLD, &sa, NULL) == -1){
printf("We have a problem, sigaction is not working.\n");
perror("\n");
exit(1);
}
// this sets up addrinfo
memset(&serverSide, 0, sizeof serverSide);
serverSide.ai_family = AF_UNSPEC;
serverSide.ai_socktype = SOCK_STREAM;
serverSide.ai_flags = INADDR_ANY;
// set up the address
if(getaddrinfo("192.168.2.10","3490",&serverSide,&serverInfo)!=0){
printf("get addr not success\n");
perror("\n");
return 1;
}
printf("Got address lists\n");
for(sortIP = serverInfo; sortIP = sortIP->ai_next; sortIP != NULL){
if((listenSock = socket(sortIP->ai_family, sortIP->ai_socktype, sortIP->ai_protocol))==-1){
continue;
}
if(setsockopt(listenSock,SOL_SOCKET,SO_REUSEADDR,&optValRet,sizeof(int))==-1){
perror("\n");
exit(1);
}
if(bind(listenSock,sortIP->ai_addr,sortIP->ai_addrlen) == -1){
perror("\n");
close(listenSock);
continue;
}
break;
}
if(sortIP == NULL){printf("sort ip is null.");}
inet_ntop(sortIP->ai_family,sortIP->ai_addr,point,sizeof point);
printf("Tell the clients connect to ip address %s on port 3490\n",point);
listen(listenSock, 10);
addr_size = sizeof their_addr;
newSock = accept(listenSock,(struct sockaddr *)&their_addr,&addr_size);
recv(newSock, buf, 500, 0);
printf("%s\n",buf);
close(listenSock);
close(newSock);
freeaddrinfo(serverInfo);
return 0;
}
现在我还有一些其他问题,除了我返回null。由于WiFi路由器分配了我的IP地址192.168.2.10为我的子网,我怎么找到我的IP地址是什么,如果我是外网,并试图联系我的服务器?我假设内部网络IP不同于外部网络IP ...我错了吗?无论如何,这些是我的两个问题。
感谢您的帮助!
为什么我下投票?我还会在哪里问这个问题? – 2012-02-05 04:05:54