016
21.05.2003, 20:20 Uhr
virtual
Sexiest Bit alive
(Operator)
|
Tut mir Leid, daß ich gestern keine Zeit mehr hatte. Ich habe mich mal eben dran gemacht, ein Beispielprogram zu schreiben. Arbeitet mit UDP und macht das, was Dein Server/Client so tun sollte.
Den Server startet man mit
Den Client analog dazu mit
Der client sollte dann 'b' zurückbekommen. Hier der Source:
| C++: |
/*udp_send.c*/
/* Define nur wegen inet_aton */
#define _BSD_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define USAGE fprintf(stderr, "usage: %s server-port character\n", szProgram);
int main(
int p_nArgC,
char** p_pszArgV)
{
const char* szProgram = *p_pszArgV+strlen(*p_pszArgV)-1;
unsigned short nPort;
int hSocket;
struct sockaddr_in oAddress;
socklen_t nLen;
char cChar;
/*
* Get invokation name
*/
while (szProgram != *p_pszArgV &&
(szProgram[-1]!='/' || szProgram[-1]!='\\') )
{
szProgram--;
}
/*
* Check command line
*/
if (3 != p_nArgC)
{
fprintf(stderr, "error: %s: illegal command line.\n", szProgram);
USAGE;
exit (EXIT_FAILURE);
}
if (1!=sscanf(p_pszArgV[1], "%hu", &nPort))
{
fprintf(stderr, "error: %s: illegal port number.\n", szProgram);
USAGE;
exit (EXIT_FAILURE);
}
cChar = p_pszArgV[2][0];
/*
* Setup server address
*/
memset(&oAddress, 0, sizeof(oAddress));
oAddress.sin_family = AF_INET;
inet_aton("127.0.0.1", &oAddress.sin_addr);
oAddress.sin_port = htons(nPort);
/*
* Create the socket
*/
hSocket = socket(AF_INET,
SOCK_DGRAM,
0);
if (-1 == hSocket)
{
fprintf(stderr, "error: %s: socket() failed: %s.\n",
szProgram, strerror(errno));
exit(EXIT_FAILURE);
}
/*
* Send the message
*/
if (1 != sendto(hSocket,
&cChar,
1,
0,
(struct sockaddr*)&oAddress,
sizeof(oAddress)))
{
fprintf(stderr, "error: %s: sendto() failed: %s.\n",
szProgram, strerror(errno));
close(hSocket);
exit(EXIT_FAILURE);
}
/*
* Wait for response
*/
nLen = sizeof(oAddress);
if (1 != recvfrom(hSocket,
&cChar,
1,
0,
(struct sockaddr*)&oAddress,
&nLen))
{
fprintf(stderr, "error: %s: recvfrom() failed: %s.\n",
szProgram, strerror(errno));
close(hSocket);
exit(EXIT_FAILURE);
}
/*
* Give information about response
*/
printf("%s:%hu answers: \'%c\'\n",
inet_ntoa(oAddress.sin_addr),
ntohs(oAddress.sin_port),
cChar);
/*
* Cleanup
*/
close(hSocket);
return EXIT_SUCCESS;
}
|
| C++: |
/* udp_recv.c */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define USAGE fprintf(stderr, "usage: %s port\n", szProgram);
int main(
int p_nArgC,
char** p_pszArgV)
{
const char* szProgram = *p_pszArgV+strlen(*p_pszArgV);
unsigned short nPort;
int hListen;
struct sockaddr_in oAddress;
/*
* Get invokation name
*/
while (szProgram != *p_pszArgV &&
(szProgram[-1]!='/' || szProgram[-1]!='\\') )
{
szProgram--;
}
/*
* Check command line
*/
if (2 != p_nArgC)
{
fprintf(stderr, "error: %s: illegal command line.\n", szProgram);
USAGE;
exit (EXIT_FAILURE);
}
if (1!=sscanf(p_pszArgV[1], "%hu", &nPort))
{
fprintf(stderr, "error: %s: illegal port number.\n", szProgram);
USAGE;
exit (EXIT_FAILURE);
}
/*
* Create the socket
*/
hListen = socket(AF_INET,
SOCK_DGRAM,
0);
if (-1 == hListen)
{
fprintf(stderr, "error: %s: socket() failed: %s.\n",
szProgram, strerror(errno));
exit(EXIT_FAILURE);
}
/*
* Bind the socket
*/
memset(&oAddress, 0, sizeof(oAddress));
oAddress.sin_family = AF_INET;
oAddress.sin_port = htons(nPort);
oAddress.sin_addr.s_addr = htonl(INADDR_ANY);
if (0 != bind(hListen,
(struct sockaddr*)&oAddress,
sizeof(oAddress)))
{
fprintf(stderr, "error: %s: bind() failed: %s.\n",
szProgram, strerror(errno));
close(hListen);
exit(EXIT_FAILURE);
}
/*
* Loop to process data
*/
printf("Waiting for incoming requests...\n");
for(;;)
{
struct sockaddr_in oClientAddress;
socklen_t nClientLen;
char cChar;
/*
* Receive data
*/
nClientLen = sizeof(oClientAddress);
if (1 != recvfrom(hListen,
&cChar,
1,
0,
(struct sockaddr*)&oClientAddress,
&nClientLen))
{
fprintf(stderr, "error: %s: recvfrom() failed: %s.\n",
szProgram, strerror(errno));
close(hListen);
exit(EXIT_FAILURE);
}
/*
* Give information about source
*/
printf("Processing request from %s:%hu, character is \'%c\'.\n",
inet_ntoa(oClientAddress.sin_addr),
ntohs(oClientAddress.sin_port),
cChar);
/*
* Increase character
*/
++cChar;
/*
* Send response
*/
if (1 != sendto(hListen,
&cChar,
1,
0,
(struct sockaddr*)&oClientAddress,
nClientLen))
{
fprintf(stderr, "error: %s: sendto() failed: %s.\n",
szProgram, strerror(errno));
close(hListen);
exit(EXIT_FAILURE);
}
}
}
|
--
Gruß, virtual
Quote of the Month
Ich eß' nur was ein Gesicht hat (Creme 21)
Dieser Post wurde am 21.05.2003 um 21:05 Uhr von virtual editiert. |
