Samuele E. Locatelli
185 lines
3.6 KiB
C
185 lines
3.6 KiB
C
#include <stdio.h>
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <sys/socket.h>
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#include <sys/select.h>
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#include <stdlib.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <time.h>
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#include <unistd.h>
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#endif
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#include <sys/types.h>
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#include <string.h>
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#define PORT 7878
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#define HOST "localhost"
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#define BUFFER_SIZE 1024
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#ifndef _WIN32
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#define SOCKET int
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#define closesocket close
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#endif
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void cleanup_and_exit(int ret)
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{
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#ifdef _WIN32
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WSACleanup();
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#endif
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exit(ret);
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}
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void usage()
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{
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fprintf(stderr, "Usage: dump [-t timeout] [host] [port] [file]\n host defaults to localhost\n port defaults to 7878\n file defaults to stdout\n");
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exit(0);
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}
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int main(int argc, char **argv)
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{
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char hostname[100];
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SOCKET sd;
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struct sockaddr_in pin;
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struct hostent *hp;
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char buffer[BUFFER_SIZE];
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int port;
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FILE *file;
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char dump = 0;
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char **argvp = argv;
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time_t start = 0;
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int remaining = 1, timeout = 0, nfds;
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struct fd_set fds;
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struct timeval tv, *tvp = 0;
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#ifdef _WIN32
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WSADATA wsaData;
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if (WSAStartup(MAKEWORD(2,0), &wsaData) != 0) {
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fprintf(stderr, "WSAStartup failed\n");
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cleanup_and_exit(1);
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}
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#endif
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if (argc > 1) {
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if (strcmp(argv[1], "-h") == 0) {
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usage();
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} else if (strcmp(argv[1], "-t") == 0) {
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if (argc < 3) {
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fprintf(stderr, "Missing timeout argument\n");
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usage();
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}
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timeout = atoi(argv[2]);
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argc -= 2;
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argvp += 2;
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}
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}
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strcpy(hostname,HOST);
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if (argc > 1) {
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strcpy(hostname,argvp[1]);
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}
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port = PORT;
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if (argc > 2) {
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port = atoi(argvp[2]);
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}
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file = stdout;
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if (argc > 3) {
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file = fopen(argvp[3], "w");
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if (file == NULL) {
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perror("fopen");
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fprintf(stderr, "Cannot open file %s\n", argv[3]);
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exit(1);
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}
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dump = 1;
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}
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/* go find out about the desired host machine */
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if ((hp = gethostbyname(hostname)) == (void*) 0) {
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perror("gethostbyname");
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cleanup_and_exit(1);
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}
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/* fill in the socket structure with host information */
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memset(&pin, 0, sizeof(pin));
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pin.sin_family = AF_INET;
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memcpy(&pin.sin_addr.s_addr, hp->h_addr, hp->h_length);
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pin.sin_port = htons(port);
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/* grab an Internet domain socket */
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if ((sd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
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perror("socket");
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cleanup_and_exit(1);
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}
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/* connect to PORT on HOST */
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if (connect(sd,(struct sockaddr *) &pin, sizeof(pin)) == -1) {
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perror("connect");
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cleanup_and_exit(1);
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}
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if (dump) {
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printf("Connected to %s port %d\n", hostname, port);
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}
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/* wait for a message to come back from the server */
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if (timeout > 0) {
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start = time(0);
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remaining = timeout;
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tv.tv_usec = 0;
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tvp = &tv;
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}
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#ifdef _WIN32
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nfds = 1;
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#else
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nfds = sd + 1;
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#endif
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while (remaining > 0) {
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int n;
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FD_ZERO(&fds);
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FD_SET(sd, &fds);
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tv.tv_sec = remaining;
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n = select(nfds, &fds, (fd_set*) 0, (fd_set*) 0, tvp);
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if (n < 0) {
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closesocket(sd);
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perror("recv");
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cleanup_and_exit(1);
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} else if (n > 0) {
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int count = recv(sd, buffer, BUFFER_SIZE, 0);
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if (count == -1) {
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closesocket(sd);
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perror("recv");
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cleanup_and_exit(1);
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}
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if (count == 0)
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break;
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fwrite(buffer, 1, count, file);
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if (dump) {
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fputc('.', stdout);
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fflush(stdout);
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}
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fflush(file);
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}
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if (timeout > 0) {
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time_t now = time(0);
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remaining -= (int) (now - start);
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start = now;
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}
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}
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if (dump) printf("\nFinished\n");
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fclose(file);
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closesocket(sd);
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#ifdef _WIN32
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WSACleanup();
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#endif
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return 0;
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}
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