| 1 | /**
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| 2 | * Rick van der Zwet <info@rickvanderzwet.nl>
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| 3 | * Licence: BSD
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| 4 | * UDP handshake taken from http://www.abc.se/~m6695/udp.html
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| 5 | */
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| 6 |
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| 7 | #include "timediff.h"
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| 8 |
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| 9 | void diep(char *s)
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| 10 | {
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| 11 | perror(s);
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| 12 | exit(1);
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| 13 | }
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| 14 |
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| 15 | int main(int argc, char * argv[]) {
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| 16 | printf("Size of .. %li\n", sizeof(uint32_t));
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| 17 | printf("Size of .. %li\n", sizeof(struct timeval));
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| 18 | struct timeval tv;
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| 19 | struct tm *tm;
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| 20 |
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| 21 | struct sockaddr_in si_me, si_other;
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| 22 | int s, i, slen=sizeof(si_other);
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| 23 | char buf[BUFLEN];
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| 24 |
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| 25 | if ((s=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP))==-1)
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| 26 | diep("socket");
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| 27 |
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| 28 | memset((char *) &si_me, 0, sizeof(si_me));
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| 29 | si_me.sin_family = AF_INET;
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| 30 | si_me.sin_port = htons(PORT);
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| 31 | si_me.sin_addr.s_addr = htonl(INADDR_ANY);
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| 32 | if (bind(s, (struct sockaddr *)&si_me, sizeof(si_me))==-1)
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| 33 | diep("bind");
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| 34 |
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| 35 | struct timeval_t packet;
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| 36 | for (i=0; i<NPACK; i++) {
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| 37 | if (recvfrom(s, &tv, sizeof(tv), 0, (struct sockaddr *)&si_other, &slen)==-1)
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| 38 | diep("recvfrom()");
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| 39 | gettimeofday(&tv,NULL);
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| 40 | packet.tv_sec = tv.tv_sec;
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| 41 | packet.tv_usec = tv.tv_usec;
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| 42 | if (sendto(s, (const void *)&packet, sizeof(packet), 0, (struct sockaddr *)&si_other, slen)==-1)
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| 43 | diep("sendto()");
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| 44 | printf("Send %i bytes\n", sizeof(packet));
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| 45 | printf("Received packet from %s:%d\n",
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| 46 | inet_ntoa(si_other.sin_addr), ntohs(si_other.sin_port));
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| 47 | tm=localtime(&tv.tv_sec);
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| 48 | printf(" %d:%02d:%02d.%li \n", tm->tm_hour, tm->tm_min, tm->tm_sec, tv.tv_usec);
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| 49 | }
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| 50 |
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| 51 | close(s);
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| 52 | return 0;
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| 53 |
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| 54 | exit(0);
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| 55 | }
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