#include<winsock.h>
#include<stdio.h>
#define DATA "half a league,half a league..."main(argc,argv)
int argc;
char *argv[];
{
int sock;
struct sockaddr_in server;
struct hostent *hp,*gethostbyname();
char buf[1024]; //建立套接字
sock=socket(AF_INET,SOCK_STREAM,0);
if(sock>0)
{
perror("opening stream socket");
exit(1);
} //使用命令行中指定的名字连接套接字。
server.sin_family=AF_INET;
hp=gethostbyname(argv[1]);
if(hp==0)
{
fprintf(stderr,"%s:unknown host\n",argv[1]);
exit(2);
} memcpy((char*)&server.sin_addr,(char *)hp->h_addr,hp->h_length);
server.sin_port=htons(atoi(argv[2]));
if(connect(sock,(struct sockaddr*)&server,sizeof(server))<0)
{
perror("connecting stream socket");
exit(3);
} if(send(sock,DATA,sizeof(DATA),0)<0)
perror("sending on stream socket"); closesocket(sock);
exit(0);
}怎么错误百出啊,竟然有重复定义
gethostbyname()
请哪位大哥帮忙修改一下!
百分独送!
#include<stdio.h>
#define DATA "half a league,half a league..."main(argc,argv)
int argc;
char *argv[];
{
int sock;
struct sockaddr_in server;
struct hostent *hp,*gethostbyname();
char buf[1024]; //建立套接字
sock=socket(AF_INET,SOCK_STREAM,0);
if(sock>0)
{
perror("opening stream socket");
exit(1);
} //使用命令行中指定的名字连接套接字。
server.sin_family=AF_INET;
hp=gethostbyname(argv[1]);
if(hp==0)
{
fprintf(stderr,"%s:unknown host\n",argv[1]);
exit(2);
} memcpy((char*)&server.sin_addr,(char *)hp->h_addr,hp->h_length);
server.sin_port=htons(atoi(argv[2]));
if(connect(sock,(struct sockaddr*)&server,sizeof(server))<0)
{
perror("connecting stream socket");
exit(3);
} if(send(sock,DATA,sizeof(DATA),0)<0)
perror("sending on stream socket"); closesocket(sock);
exit(0);
}怎么错误百出啊,竟然有重复定义
gethostbyname()
请哪位大哥帮忙修改一下!
百分独送!
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重复定义
* ping.c - Simple ping utility using SOCK_RAW
*
* This is a part of the Microsoft Source Code Samples.
* Copyright 1996-1997 Microsoft Corporation.
* All rights reserved.
* This source code is only intended as a supplement to
* Microsoft Development Tools and/or WinHelp documentation.
* See these sources for detailed information regarding the
* Microsoft samples programs.
\******************************************************************************/#pragma pack(4)#define WIN32_LEAN_AND_MEAN
#include <winsock2.h>
#include <stdio.h>
#include <stdlib.h>#define ICMP_ECHO 8
#define ICMP_ECHOREPLY 0#define ICMP_MIN 8 // minimum 8 byte icmp packet (just header)/* The IP header */
typedef struct iphdr {
unsigned int h_len:4; // length of the header
unsigned int version:4; // Version of IP
unsigned char tos; // Type of service
unsigned short total_len; // total length of the packet
unsigned short ident; // unique identifier
unsigned short frag_and_flags; // flags
unsigned char ttl;
unsigned char proto; // protocol (TCP, UDP etc)
unsigned short checksum; // IP checksum unsigned int sourceIP;
unsigned int destIP;}IpHeader;//
// ICMP header
//
typedef struct _ihdr {
BYTE i_type;
BYTE i_code; /* type sub code */
USHORT i_cksum;
USHORT i_id;
USHORT i_seq;
/* This is not the std header, but we reserve space for time */
ULONG timestamp;
}IcmpHeader;#define STATUS_FAILED 0xFFFF
#define DEF_PACKET_SIZE 32
#define MAX_PACKET 1024#define xmalloc(s) HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,(s))
#define xfree(p) HeapFree (GetProcessHeap(),0,(p))void fill_icmp_data(char *, int);
USHORT checksum(USHORT *, int);
void decode_resp(char *,int ,struct sockaddr_in *);void Usage(char *progname){
fprintf(stderr,"Usage:\n");
fprintf(stderr,"%s <host> [data_size]\n",progname);
fprintf(stderr,"datasize can be up to 1Kb\n");
ExitProcess(STATUS_FAILED);}
int main(int argc, char **argv){ WSADATA wsaData;
SOCKET sockRaw;
struct sockaddr_in dest,from;
struct hostent * hp;
int bread,datasize;
int fromlen = sizeof(from);
int timeout = 1000;
char *dest_ip;
char *icmp_data;
char *recvbuf;
unsigned int addr=0;
USHORT seq_no = 0; if (WSAStartup(MAKEWORD(2,1),&wsaData) != 0){
fprintf(stderr,"WSAStartup failed: %d\n",GetLastError());
ExitProcess(STATUS_FAILED);
} if (argc <2 ) {
Usage(argv[0]);
}
sockRaw = WSASocket (AF_INET,
SOCK_RAW,
IPPROTO_ICMP,
NULL, 0,0);
if (sockRaw == INVALID_SOCKET) {
fprintf(stderr,"WSASocket() failed: %d\n",WSAGetLastError());
ExitProcess(STATUS_FAILED);
}
bread = setsockopt(sockRaw,SOL_SOCKET,SO_RCVTIMEO,(char*)&timeout,
sizeof(timeout));
if(bread == SOCKET_ERROR) {
fprintf(stderr,"failed to set recv timeout: %d\n",WSAGetLastError());
ExitProcess(STATUS_FAILED);
}
timeout = 1000;
bread = setsockopt(sockRaw,SOL_SOCKET,SO_SNDTIMEO,(char*)&timeout,
sizeof(timeout));
if(bread == SOCKET_ERROR) {
fprintf(stderr,"failed to set send timeout: %d\n",WSAGetLastError());
ExitProcess(STATUS_FAILED);
}
memset(&dest,0,sizeof(dest)); hp = gethostbyname(argv[1]); if (!hp){
addr = inet_addr(argv[1]);
}
if ((!hp) && (addr == INADDR_NONE) ) {
fprintf(stderr,"Unable to resolve %s\n",argv[1]);
ExitProcess(STATUS_FAILED);
} if (hp != NULL)
memcpy(&(dest.sin_addr),hp->h_addr,hp->h_length);
else
dest.sin_addr.s_addr = addr; if (hp)
dest.sin_family = hp->h_addrtype;
else
dest.sin_family = AF_INET; dest_ip = inet_ntoa(dest.sin_addr); if (argc >2) {
datasize = atoi(argv[2]);
if (datasize == 0)
datasize = DEF_PACKET_SIZE; }
else
datasize = DEF_PACKET_SIZE;
datasize += sizeof(IcmpHeader); icmp_data = xmalloc(MAX_PACKET);
recvbuf = xmalloc(MAX_PACKET); if (!icmp_data) {
fprintf(stderr,"HeapAlloc failed %d\n",GetLastError());
ExitProcess(STATUS_FAILED);
}
memset(icmp_data,0,MAX_PACKET);
fill_icmp_data(icmp_data,datasize); while(1) {
int bwrote;
((IcmpHeader*)icmp_data)->i_cksum = 0;
((IcmpHeader*)icmp_data)->timestamp = GetTickCount(); ((IcmpHeader*)icmp_data)->i_seq = seq_no++;
((IcmpHeader*)icmp_data)->i_cksum = checksum((USHORT*)icmp_data,
datasize); bwrote = sendto(sockRaw,icmp_data,datasize,0,(struct sockaddr*)&dest,
sizeof(dest));
if (bwrote == SOCKET_ERROR){
if (WSAGetLastError() == WSAETIMEDOUT) {
printf("timed out\n");
continue;
}
fprintf(stderr,"sendto failed: %d\n",WSAGetLastError());
ExitProcess(STATUS_FAILED);
}
if (bwrote < datasize ) {
fprintf(stdout,"Wrote %d bytes\n",bwrote);
}
bread = recvfrom(sockRaw,recvbuf,MAX_PACKET,0,(struct sockaddr*)&from,
&fromlen);
if (bread == SOCKET_ERROR){
if (WSAGetLastError() == WSAETIMEDOUT) {
printf("timed out\n");
continue;
}
fprintf(stderr,"recvfrom failed: %d\n",WSAGetLastError());
ExitProcess(STATUS_FAILED);
}
decode_resp(recvbuf,bread,&from);
Sleep(1000); }
return 0;}
/*
The response is an IP packet. We must decode the IP header to locate
the ICMP data
*/
void decode_resp(char *buf, int bytes,struct sockaddr_in *from) { IpHeader *iphdr;
IcmpHeader *icmphdr;
unsigned short iphdrlen; iphdr = (IpHeader *)buf; iphdrlen = iphdr->h_len * 4 ; // number of 32-bit words *4 = bytes if (bytes < iphdrlen + ICMP_MIN) {
printf("Too few bytes from %s\n",inet_ntoa(from->sin_addr));
} icmphdr = (IcmpHeader*)(buf + iphdrlen); if (icmphdr->i_type != ICMP_ECHOREPLY) {
fprintf(stderr,"non-echo type %d recvd\n",icmphdr->i_type);
return;
}
if (icmphdr->i_id != (USHORT)GetCurrentProcessId()) {
fprintf(stderr,"someone else's packet!\n");
return ;
}
printf("%d bytes from %s:",bytes, inet_ntoa(from->sin_addr));
printf(" icmp_seq = %d. ",icmphdr->i_seq);
printf(" time: %d ms ",GetTickCount()-icmphdr->timestamp);
printf("\n");
}
USHORT checksum(USHORT *buffer, int size) { unsigned long cksum=0; while(size >1) {
cksum+=*buffer++;
size -=sizeof(USHORT);
}
if(size ) {
cksum += *(UCHAR*)buffer;
} cksum = (cksum >> 16) + (cksum & 0xffff);
cksum += (cksum >>16);
return (USHORT)(~cksum);
}
/*
Helper function to fill in various stuff in our ICMP request.
*/
void fill_icmp_data(char * icmp_data, int datasize){ IcmpHeader *icmp_hdr;
char *datapart; icmp_hdr = (IcmpHeader*)icmp_data; icmp_hdr->i_type = ICMP_ECHO;
icmp_hdr->i_code = 0;
icmp_hdr->i_id = (USHORT)GetCurrentProcessId();
icmp_hdr->i_cksum = 0;
icmp_hdr->i_seq = 0;
datapart = icmp_data + sizeof(IcmpHeader);
//
// Place some junk in the buffer.
//
memset(datapart,'E', datasize - sizeof(IcmpHeader));}
#include<stdio.h>
#define DATA "half a league,half a league..."main(argc,argv)
int argc;
char *argv[];
{
int sock;
struct sockaddr_in server;
struct hostent *hp();
char buf[1024];
WSADATA wsaData; if (WSAStartup(MAKEWORD(2,1),&wsaData) != 0){
fprintf(stderr,"WSAStartup failed: %d\n",GetLastError());
ExitProcess(STATUS_FAILED);
} //建立套接字
sock=socket(AF_INET,SOCK_STREAM,0);
if(sock>0)
{
perror("opening stream socket");
exit(1);
} //使用命令行中指定的名字连接套接字。
server.sin_family=AF_INET;
hp=gethostbyname(argv[1]);
if(hp==0)
{
fprintf(stderr,"%s:unknown host\n",argv[1]);
exit(2);
} memcpy((char*)&server.sin_addr,(char *)hp->h_addr,hp->h_length);
server.sin_port=htons(atoi(argv[2]));
if(connect(sock,(struct sockaddr*)&server,sizeof(server))<0)
{
perror("connecting stream socket");
exit(3);
} if(send(sock,DATA,sizeof(DATA),0)<0)
perror("sending on stream socket"); closesocket(sock);
exit(0);
}
ws2_32.lib这个是书上例子啊!
http://www.cic.tsinghua.edu.cn/sys/book2/
第二章 2.4里的!
#include <winsock.h>
#include <stdio.h>#pragma comment(lib, "ws2_32.lib")
#define DATA "half a league, half a league ..."/* 这个程序建立套接字,然后与命令行给出的套接字连接;连接结束时,在连接上发送 一个消息,然后关闭套接字。命令行的格式是:streamc 主机名 端口号 端口号要与服务器程序的端口号相同 */void main(int argc, char *argv[])
{ int sock;
struct sockaddr_in server;
struct hostent *hp;
char buf[1024]; /* 建立套接字 */
sock = socket(AF_INET, SOCK_STREAM, 0); if (sock < 0) {
perror("opening stream socket");
exit(1);
} /* 使用命令行中指定的名字连接套接字 */
server.sin_family = AF_INET;
hp = gethostbyname(argv[1]);
if (hp == 0) {
fprintf(stderr, "%s: unknown host \n", argv[1]);
exit(2);
} memcpy((char*)&server.sin_addr, (char*)hp->h_addr, hp->h_length);
server.sin_port = htons(atoi(argv[2]));
if (connect(sock, (struct sockaddr*)&server, sizeof(server)) < 0) {
perror("connecting stream socket");
exit(3);
} if (send(sock, DATA, lstrlen(DATA), 0) < 0)
perror("sending on stream socket"); closesocket(sock);
exit(0);
}
#include <winsock.h>
#include <stdio.h>#pragma comment(lib, "ws2_32.lib")
#define DATA "half a league, half a league ..."/* 这个程序建立套接字,然后与命令行给出的套接字连接;连接结束时,在连接上发送 一个消息,然后关闭套接字。命令行的格式是:streamc 主机名 端口号 端口号要与服务器程序的端口号相同 */void main(int argc, char *argv[])
{ int sock;
struct sockaddr_in server;
struct hostent *hp;
char buf[1024]; /* 建立套接字 */
sock = socket(AF_INET, SOCK_STREAM, 0); if (sock < 0) {
perror("opening stream socket");
exit(1);
} /* 使用命令行中指定的名字连接套接字 */
server.sin_family = AF_INET;
hp = gethostbyname(argv[1]);
if (hp == 0) {
fprintf(stderr, "%s: unknown host \n", argv[1]);
exit(2);
} memcpy((char*)&server.sin_addr, (char*)hp->h_addr, hp->h_length);
server.sin_port = htons(atoi(argv[2]));
if (connect(sock, (struct sockaddr*)&server, sizeof(server)) < 0) {
perror("connecting stream socket");
exit(3);
} if (send(sock, DATA, lstrlen(DATA), 0) < 0)
perror("sending on stream socket"); closesocket(sock);
exit(0);
}