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linux socket源代码 可用 网上我没…

2013-07-10 22:07 381 查看
//server.c - a server, datagram
sockets
#include
<stdio.h>
#include
<stdlib.h>
#include
<unistd.h>
#include
<errno.h>
#include
<string.h>
#include
<sys/types.h>
#include
<sys/socket.h>
#include
<netinet/in.h>
#include
<arpa/inet.h>
//
the port users will be connecting to
#define MYPORT 9989
#define MAXBUFLEN 500

int main(int argc, char
*argv[])
{
int sockfd;
//
my address information
struct sockaddr_in my_addr;
//
connector’s address information
struct sockaddr_in their_addr;
int addr_len, numbytes;
char buf[MAXBUFLEN];

if((sockfd = socket(AF_INET, SOCK_DGRAM, 0))
== -1)
{

perror("Server-socket() sockfd error lol!");

exit(1);
}
else

printf("Server-socket() sockfd is OK...\n");

//
host byte order
my_addr.sin_family = AF_INET;
//
short, network byte order
my_addr.sin_port =
htons(MYPORT);
//
automatically fill with my IP
my_addr.sin_addr.s_addr =
INADDR_ANY;
//
zero the rest of the struct
memset(&(my_addr.sin_zero),
'\0', 8);

if(bind(sockfd, (struct sockaddr
*)&my_addr, sizeof(struct sockaddr)) ==
-1)
{

perror("Server-bind() error lol!");

exit(1);
}
else

printf("Server-bind() is OK...\n");

addr_len = sizeof(struct
sockaddr);
while (1)
{

if((numbytes =
recvfrom(sockfd, buf, MAXBUFLEN-1, 0, (struct sockaddr
*)&their_addr, (socklen_t
*)&addr_len)) == -1)

{

perror("Server-recvfrom() error lol!");

//If
something wrong, just exit lol...

exit(1);

}

else

{

printf("Server-Waiting and listening...\n");

printf("Server-recvfrom() is OK...\n");

}

printf("Server-Got packet
from %s\n", inet_ntoa(their_addr.sin_addr));

printf("Server-Packet is %d
bytes long\n", numbytes);

buf[numbytes] =
'\0';

printf("Server-Packet
contains \"%s\"\n", buf);
}

if(close(sockfd) != 0)

printf("Server-sockfd closing failed!\n");
else

printf("Server-sockfd successfully closed!\n");
return 0;
}

//client.c - a client, datagram
#include
<stdio.h>
#include
<stdlib.h>
#include
<unistd.h>
#include
<errno.h>
#include
<string.h>
#include
<sys/types.h>
#include
<sys/socket.h>
#include
<netinet/in.h>
#include
<arpa/inet.h>
#include
<netdb.h>
//
the port users will be connecting to
#define MYPORT 9989

int main(int argc, char *argv[])
{

int sockfd;

// connector’s address
information

struct sockaddr_in
their_addr;

struct hostent
*he;

int numbytes;

if (argc != 3) {

fprintf(stderr, "Client-Usage: %s
<hostname>
<message>\n", argv[0]);

exit(1);

}

// get the host
info

if ((he =
gethostbyname(argv[1])) == NULL) {

perror("Client-gethostbyname() error lol!");

exit(1);

} else

printf("Client-gethostname() is OK...\n");

if ((sockfd = socket(AF_INET,
SOCK_DGRAM, 0)) == -1) {

perror("Client-socket() error lol!");

exit(1);

} else

printf("Client-socket() sockfd is OK...\n");

// host byte
order

their_addr.sin_family =
AF_INET;

// short, network byte
order

printf("Using port:
4950\n");

their_addr.sin_port =
htons(MYPORT);

their_addr.sin_addr =
*((struct in_addr *) he->h_addr);

// zero the rest of the
struct

memset(&(their_addr.sin_zero), '\0',
8);

if ((numbytes =
sendto(sockfd, argv[2], strlen(argv[2]), 0,

(struct sockaddr *) &their_addr,
sizeof(struct sockaddr))) == -1) {

perror("Client-sendto() error lol!");

exit(1);

} else

printf("Client-sendto() is OK...\n");

printf("sent %d bytes to
%s\n", numbytes, inet_ntoa(their_addr.sin_addr));

if (close(sockfd) !=
0)

printf("Client-sockfd closing is failed!\n");

else

printf("Client-sockfd successfully closed!\n");

return 0;
}

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