87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
/*
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* EMC SRVTELNET
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#define BINDADDR "127.0.0.1"
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#define TL 20
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int main(int argc, char *argv[])
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{
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int foo, len, sock;
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char *adr_ip = BINDADDR;
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int port = 5678;
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unsigned int addrlen;
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int connected;
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struct sockaddr_in addr;
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struct in_addr ia;
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FILE *fpin;
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char line[TL+5], *ptr;
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fprintf(stderr, "--- %s ---\n", argv[0]);
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sock = socket(AF_INET, SOCK_STREAM, 0);
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if (sock < 0) {
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perror(__FILE__ " start socket");
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return -1;
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}
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#define S sizeof(struct sockaddr_in)
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memset(&addr, 0, S);
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addr.sin_family = AF_INET;
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addr.sin_port = htons(port);
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if (adr_ip && inet_aton(adr_ip, &ia)) {
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addr.sin_addr = ia;
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fprintf(stderr, "attached to %s\n", adr_ip);
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}
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if ((foo=bind(sock, (struct sockaddr *)&addr, S)) < 0) {
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perror(__FILE__ " fail on bind ");
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close(sock);
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return -2;
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}
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fprintf(stderr, "bind -> %d\n", foo);
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foo = listen(sock, 5); /* 5 is a bsd magic number */
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if (foo) {
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perror(__FILE__ " no magic in listen ");
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return -3;
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}
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/* start of the endless loop */
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for (;;) {
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fprintf(stderr, "accepting...\n");
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addrlen = sizeof(struct sockaddr);
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connected = accept(sock, (struct sockaddr *)&addr, &addrlen);
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if (connected < 0) {
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perror(__FILE__ " accept");
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return -1;
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}
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fprintf(stderr, "accept -> %d\n", connected);
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if (NULL==(fpin = fdopen(connected, "r+"))) {
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perror(__FILE__ " fdopen on connected");
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return -3;
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}
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// fprintf(stderr, "fopened...\n");
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while ( (ptr=fgets(line, TL, fpin)) ) {
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len = strlen(line);
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fprintf(stderr, " %3d | %s", len, line);
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for (foo=0; foo<len; foo++) {
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fprintf(fpin, "%02X ", (unsigned char)line[foo]);
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}
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fputs("\n", fpin);
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}
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close(connected);
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} /* end of the endless loop */
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return 0;
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}
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