109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <netinet/in.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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struct sockaddr_in endpoint;
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FILE *flog;
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char myhostname[1024];
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int main(int argc, char **argv) {
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long lnIn1, lnIn2, lhIn1, lhIn2, lhOut, lnOut;
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int sdServerSocket, sdConnection, retval;
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socklen_t sin_size;
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struct sockaddr_in incoming;
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struct hostent *heLocalHost;
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char sign;
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sin_size = sizeof(struct sockaddr_in);
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sdServerSocket = socket(PF_INET, SOCK_STREAM, 0);
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gethostname(myhostname, 1023);
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heLocalHost = gethostbyname(myhostname);
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endpoint.sin_family = AF_INET;
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endpoint.sin_port = htons(14444);
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endpoint.sin_addr = *(struct in_addr*)
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heLocalHost->h_addr;
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memset(&(endpoint.sin_zero),0,8);
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printf("slucham na(listening on) %s:%d\n",
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inet_ntoa(endpoint.sin_addr),
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ntohs(endpoint.sin_port));
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retval = bind(sdServerSocket,
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(struct sockaddr*) &endpoint,
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sizeof(struct sockaddr));
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if (retval < 0) {
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printf("bind nie powiodl sie (bind failed)\n");
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return 1;
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}
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listen(sdServerSocket, 10);
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sin_size = sizeof(struct sockaddr_in);
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while ((sdConnection =
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accept(sdServerSocket,
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(struct sockaddr*) &incoming,
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&sin_size))
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> 0) {
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printf("Polaczenie z (connection with)%s:%d\n",
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inet_ntoa(incoming.sin_addr),
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ntohs(incoming.sin_port));
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if (recv(sdConnection, &lnIn1, sizeof(long),0)
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!= sizeof(long)) {
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printf("pierwszy recv nie powiodl sie (first recv failed)\n");
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close(sdConnection);
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continue;
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}
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lhIn1 = ntohl(lnIn1);
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lhOut = random();
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lnOut = htonl(lhOut);
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if (send(sdConnection, &lnOut, sizeof(long), 0)
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!= sizeof(long)) {
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printf("send nie powiodl sie (send failed)\n");
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close(sdConnection);
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continue;
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}
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if (recv(sdConnection, &lnIn2, sizeof(long), 0)
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!= sizeof(long)) {
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printf("drugi recv nie powiodl sie (second recv failed)\n");
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close(sdConnection);
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continue;
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}
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lhIn2 = ntohl(lnIn2);
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flog = fopen("zad.txt","a");
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if (lhIn2 == lhOut + 1) sign = '+';
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else sign = '-';
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fprintf(flog,"%c %ld from %s:%d : %ld, %ld\n",
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sign,
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lhIn1,
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inet_ntoa(incoming.sin_addr),
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ntohs(incoming.sin_port),
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lhOut,
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lhIn2);
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close(sdConnection);
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fflush(flog);
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fclose(flog);
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}
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printf("Blad sieci (network error)\n");
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fclose(flog);
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return 0;
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}
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