64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
#include <stdio.h>
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#include <time.h>
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#include <stdlib.h>
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#include <string.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 "md5.h"
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int main(int argc, char **argv) {
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if (argc != 5) {
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printf("wrong number of arguments, requires dynid, shared secret, server ip, server port\n");
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return 1;
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}
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const char *dynid = argv[1];
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const char *sharedSecret = argv[2];
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const char *serverIp = argv[3];
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int serverPort = atoi(argv[4]);
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if (strlen(dynid) > 64 || strlen(sharedSecret) > 64) {
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printf("dynid or shared secret too long, max 64 chars each\n");
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return 2;
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}
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if (strlen(serverIp) < 7 || strlen(serverIp) > 15) {
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printf("server ip too short or too long\n");
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return 3;
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}
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int t = (int) time(NULL);
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char buf[256];
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sprintf(buf, "%s %s %d", dynid, sharedSecret, t);
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md5_state_t state;
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md5_init(&state);
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md5_append(&state, buf, strlen(buf));
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char c[16];
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md5_finish(&state, c);
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sprintf(buf, "%s %d %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
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dynid, t,
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(c[0] & 0xff), (c[1] & 0xff), (c[2] & 0xff), (c[3] & 0xff),
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(c[4] & 0xff), (c[5] & 0xff), (c[6] & 0xff), (c[7] & 0xff),
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(c[8] & 0xff), (c[9] & 0xff), (c[10] & 0xff), (c[11] & 0xff),
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(c[12] & 0xff), (c[13] & 0xff), (c[14] & 0xff), (c[15] & 0xff));
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struct sockaddr_in servaddr;
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memset(&servaddr, 0, sizeof(servaddr));
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servaddr.sin_family = AF_INET;
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servaddr.sin_port = htons(serverPort);
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inet_pton(AF_INET, serverIp, &servaddr.sin_addr);
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int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
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sendto(sockfd, buf, strlen(buf), 0, (struct sockaddr*) &servaddr, sizeof(servaddr));
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close(sockfd);
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return 0;
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}
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