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/* this program is used to test UDP networking in Android.
* used to debug the emulator's networking implementation
*/
#define PROGNAME "test_udp"
#define DEFAULT_PORT 7000
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <string.h>
#define BUFLEN 512
#define NPACK 10
void diep(char *s)
{
perror(s);
exit(1);
}
static void
usage(int code)
{
printf("usage: %s [options]\n", PROGNAME);
printf("options:\n");
printf(" -p<port> use specific port (default %d)\n", DEFAULT_PORT);
printf(" -a<inet> use specific IP address\n");
printf(" -s run server (default is client)\n");
exit(code);
}
int main(int argc, char** argv)
{
int runServer = 0;
int udpPort = DEFAULT_PORT;
int useLocal = 0;
int address = htonl(INADDR_ANY);
struct sockaddr_in si_me, si_other;
int s, i, slen=sizeof(si_other);
char buf[BUFLEN];
while (argc > 1 && argv[1][0] == '-') {
const char* optName = argv[1]+1;
argc--;
argv++;
switch (optName[0]) {
case 'p':
udpPort = atoi(optName+1);
if (udpPort < 1024 || udpPort > 65535) {
fprintf(stderr, "UDP port must be between 1024 and 65535\n");
exit(1);
}
break;
case 's':
runServer = 1;
break;
case 'a':
if (inet_aton(optName+1, &si_other.sin_addr) == 0)
diep("inet_aton");
address = si_other.sin_addr.s_addr;
break;
default:
usage(1);
}
}
if (runServer) {
if ((s=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP))==-1)
diep("socket");
memset((char *) &si_me, 0, sizeof(si_me));
si_me.sin_family = AF_INET;
si_me.sin_port = htons(udpPort);
si_me.sin_addr.s_addr = address;
if (bind(s, (struct sockaddr*)&si_me, sizeof(si_me))==-1)
diep("bind");
printf("UDP server listening on %s:%d\n", inet_ntoa(si_me.sin_addr), udpPort);
for (i=0; i<NPACK; i++) {
if (recvfrom(s, buf, BUFLEN, 0, (struct sockaddr*)&si_other, (socklen_t*)&slen)==-1)
diep("recvfrom()");
printf("Received packet from %s:%d\nData: %s\n\n",
inet_ntoa(si_other.sin_addr), ntohs(si_other.sin_port), buf);
}
printf("UDP server closing\n");
close(s);
}
else /* !runServer */
{
if ((s=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP))==-1)
diep("socket");
memset((char *) &si_other, 0, sizeof(si_other));
si_other.sin_family = AF_INET;
si_other.sin_port = htons(udpPort);
si_other.sin_addr.s_addr = address;
printf("UDP client sending packets to %s:%d\n", inet_ntoa(si_other.sin_addr), udpPort);
for (i=0; i<NPACK; i++) {
printf("Sending packet %d\n", i);
sprintf(buf, "This is packet %d\n", i);
if (sendto(s, buf, BUFLEN, 0, (struct sockaddr*)&si_other, slen)==-1)
diep("sendto()");
}
close(s);
printf("UDP client closing\n");
}
return 0;
}
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