Command line options with getopt_long
This commit is contained in:
Kevin Lange
parent
022782ce09
commit
672b3abae0
338
src/nyancat.c
338
src/nyancat.c
@ -59,6 +59,7 @@
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#include <time.h>
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#include <setjmp.h>
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#include <sys/ioctl.h>
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#include <getopt.h>
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#ifndef TIOCGWINSZ
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#include <termios.h>
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@ -236,6 +237,17 @@ void send_command(int cmd, int opt) {
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}
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}
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void usage(char * argv[]) {
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printf(
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"Terminal Nyancat\n"
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"\n"
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"usage: %s [-h] [-t] [-i] \n"
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"\n"
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" -i --intro \033[3mShow the introduction / about informaiton at startup.\033[0m\n"
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" -t --telnet \033[3mTelnet mode.\033[0m\n",
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" -h --help \033[3mShow this help message.\033[0m\n",
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argv[0]);
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}
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int main(int argc, char ** argv) {
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@ -249,126 +261,160 @@ int main(int argc, char ** argv) {
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char sb[1024] = {0};
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char sb_len = 0;
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if (argc > 1) {
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if (!strcmp(argv[1], "-t")) {
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/* Yes, I know, lame way to get arguments, whatever, we only want one of them. */
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telnet = 1;
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char show_intro = 0;
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/* Set the default options */
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set_options();
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/* Long option names */
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static struct option long_opts[] = {
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{"help", no_argument, 0, 'h'},
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{"telnet", no_argument, 0, 't'},
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{"intro", no_argument, 0, 'i'},
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{0,0,0,0}
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};
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/* Let the client know what we're using */
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for (option = 0; option < 256; option++) {
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if (telnet_options[option]) {
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send_command(telnet_options[option], option);
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fflush(stdout);
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}
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/* Process arguments */
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int index, c;
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while ((c = getopt_long(argc, argv, "hit", long_opts, &index)) != -1) {
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if (!c) {
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if (long_opts[index].flag == 0) {
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c = long_opts[index].val;
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}
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for (option = 0; option < 256; option++) {
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if (telnet_willack[option]) {
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send_command(telnet_willack[option], option);
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fflush(stdout);
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}
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}
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switch (c) {
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case 'i': /* Show introduction */
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show_intro = 1;
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break;
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case 't': /* Expect telnet bits */
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telnet = 1;
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break;
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case 'h': /* Show help and exit */
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usage(argv);
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exit(0);
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break;
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default:
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break;
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}
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}
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if (telnet) {
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/* Telnet mode */
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/* Intro is implied by telnet mode, so override whatever was asked for. */
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show_intro = 1;
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/* Set the default options */
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set_options();
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/* Let the client know what we're using */
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for (option = 0; option < 256; option++) {
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if (telnet_options[option]) {
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send_command(telnet_options[option], option);
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fflush(stdout);
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}
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}
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for (option = 0; option < 256; option++) {
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if (telnet_willack[option]) {
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send_command(telnet_willack[option], option);
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fflush(stdout);
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}
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}
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/* Set the alarm handler to execute the longjmp */
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signal(SIGALRM, SIGALRM_handler);
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/* Set the alarm handler to execute the longjmp */
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signal(SIGALRM, SIGALRM_handler);
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/* Negotiate options */
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if (!setjmp(environment)) {
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/* We will stop handling options after one second */
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alarm(1);
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/* Negotiate options */
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if (!setjmp(environment)) {
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/* We will stop handling options after one second */
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alarm(1);
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/* Let's do this */
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while (!feof(stdin) && done < 2) {
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/* Get either IAC (start command) or a regular character (break, unless in SB mode) */
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unsigned char i = getchar();
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unsigned char opt = 0;
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if (i == IAC) {
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/* If IAC, get the command */
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i = getchar();
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switch (i) {
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case SE:
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/* End of extended option mode */
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sb_mode = 0;
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if (sb[0] == TTYPE) {
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/* This was a response to the TTYPE command, meaning
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* that this should be a terminal type */
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alarm(0);
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strcpy(term, &sb[2]);
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done++;
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}
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else if (sb[0] == NAWS) {
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/* This was a response to the NAWS command, meaning
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* that this should be a window size */
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alarm(0);
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terminal_width = sb[2];
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done++;
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}
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break;
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case NOP:
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/* No Op */
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send_command(NOP, 0);
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/* Let's do this */
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while (!feof(stdin) && done < 2) {
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/* Get either IAC (start command) or a regular character (break, unless in SB mode) */
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unsigned char i = getchar();
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unsigned char opt = 0;
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if (i == IAC) {
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/* If IAC, get the command */
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i = getchar();
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switch (i) {
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case SE:
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/* End of extended option mode */
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sb_mode = 0;
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if (sb[0] == TTYPE) {
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/* This was a response to the TTYPE command, meaning
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* that this should be a terminal type */
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alarm(0);
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strcpy(term, &sb[2]);
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done++;
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}
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else if (sb[0] == NAWS) {
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/* This was a response to the NAWS command, meaning
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* that this should be a window size */
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alarm(0);
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terminal_width = sb[2];
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done++;
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}
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break;
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case NOP:
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/* No Op */
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send_command(NOP, 0);
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fflush(stdout);
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break;
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case WILL:
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case WONT:
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/* Will / Won't Negotiation */
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opt = getchar();
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if (!telnet_willack[opt]) {
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/* We default to WONT */
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telnet_willack[opt] = WONT;
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}
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send_command(telnet_willack[opt], opt);
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fflush(stdout);
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if ((i == WILL) && (opt == TTYPE)) {
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/* WILL TTYPE? Great, let's do that now! */
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printf("%c%c%c%c%c%c", IAC, SB, TTYPE, SEND, IAC, SE);
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fflush(stdout);
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break;
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case WILL:
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case WONT:
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/* Will / Won't Negotiation */
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opt = getchar();
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if (!telnet_willack[opt]) {
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/* We default to WONT */
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telnet_willack[opt] = WONT;
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}
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send_command(telnet_willack[opt], opt);
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fflush(stdout);
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if ((i == WILL) && (opt == TTYPE)) {
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/* WILL TTYPE? Great, let's do that now! */
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printf("%c%c%c%c%c%c", IAC, SB, TTYPE, SEND, IAC, SE);
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fflush(stdout);
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}
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break;
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case DO:
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case DONT:
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/* Do / Don't Negotation */
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opt = getchar();
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if (!telnet_options[opt]) {
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/* We default to DONT */
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telnet_options[opt] = DONT;
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}
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send_command(telnet_options[opt], opt);
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if (opt == ECHO) {
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/* We don't really need this, as we don't accept input, but,
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* in case we do in the future, set our echo mode */
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do_echo = (i == DO);
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}
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fflush(stdout);
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break;
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case SB:
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/* Begin Extended Option Mode */
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sb_mode = 1;
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sb_len = 0;
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memset(sb, 0, 1024);
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break;
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case IAC:
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/* IAC IAC? That's probably not right. */
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done = 2;
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break;
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default:
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break;
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}
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} else if (sb_mode) {
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/* Extended Option Mode -> Accept character */
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if (sb_len < 1023) {
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/* Append this character to the SB string,
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* but only if it doesn't put us over
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* our limit; honestly, we shouldn't hit
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* the limit, as we're only collecting characters
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* for a terminal type or window size, but better safe than
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* sorry (and vulernable).
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*/
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sb[sb_len] = i;
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sb_len++;
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}
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}
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break;
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case DO:
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case DONT:
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/* Do / Don't Negotation */
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opt = getchar();
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if (!telnet_options[opt]) {
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/* We default to DONT */
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telnet_options[opt] = DONT;
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}
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send_command(telnet_options[opt], opt);
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if (opt == ECHO) {
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/* We don't really need this, as we don't accept input, but,
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* in case we do in the future, set our echo mode */
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do_echo = (i == DO);
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}
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fflush(stdout);
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break;
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case SB:
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/* Begin Extended Option Mode */
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sb_mode = 1;
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sb_len = 0;
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memset(sb, 0, 1024);
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break;
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case IAC:
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/* IAC IAC? That's probably not right. */
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done = 2;
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break;
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default:
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break;
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}
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} else if (sb_mode) {
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/* Extended Option Mode -> Accept character */
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if (sb_len < 1023) {
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/* Append this character to the SB string,
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* but only if it doesn't put us over
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* our limit; honestly, we shouldn't hit
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* the limit, as we're only collecting characters
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* for a terminal type or window size, but better safe than
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* sorry (and vulernable).
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*/
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sb[sb_len] = i;
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sb_len++;
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}
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}
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}
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@ -379,7 +425,7 @@ int main(int argc, char ** argv) {
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char * nterm = getenv("TERM");
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if (nterm)
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strcpy(term, nterm);
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/* Also get the number of columns */
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struct winsize w;
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ioctl(0, TIOCGWINSZ, &w);
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@ -390,7 +436,7 @@ int main(int argc, char ** argv) {
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for (k = 0; k < strlen(term); ++k) {
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term[k] = tolower(term[k]);
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}
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/* We don't want terminals wider than 80 columns */
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if(terminal_width > 80) terminal_width = 80;
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@ -548,40 +594,42 @@ int main(int argc, char ** argv) {
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/* Clear the screen */
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printf("\033[H\033[2J\033[?25l");
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/* Display the MOTD */
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int countdown_clock = 5;
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for (k = 0; k < countdown_clock; ++k) {
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newline(3);
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printf(" \033[1mNyancat Telnet Server\033[0m");
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newline(2);
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printf(" written and run by \033[1;32mKevin Lange\033[1;34m @kevinlange\033[0m");
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newline(2);
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printf(" If things don't look right, try:");
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newline(1);
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printf(" TERM=fallback telnet ...");
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newline(2);
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printf(" Or on Windows:");
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newline(1);
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printf(" telnet -t vtnt ...");
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newline(2);
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printf(" Problems? I am also a webserver:");
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newline(1);
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printf(" \033[1;34mhttp://miku.acm.uiuc.edu\033[0m");
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newline(2);
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printf(" This is a telnet server, remember your escape keys!");
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newline(1);
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printf(" \033[1;31m^]quit\033[0m to exit");
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newline(2);
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printf(" Starting in %d... \n", countdown_clock-k);
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if (show_intro) {
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/* Display the MOTD */
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int countdown_clock = 5;
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for (k = 0; k < countdown_clock; ++k) {
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newline(3);
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printf(" \033[1mNyancat Telnet Server\033[0m");
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newline(2);
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printf(" written and run by \033[1;32mKevin Lange\033[1;34m @kevinlange\033[0m");
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newline(2);
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printf(" If things don't look right, try:");
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newline(1);
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printf(" TERM=fallback telnet ...");
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newline(2);
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printf(" Or on Windows:");
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newline(1);
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printf(" telnet -t vtnt ...");
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newline(2);
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printf(" Problems? I am also a webserver:");
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newline(1);
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printf(" \033[1;34mhttp://miku.acm.uiuc.edu\033[0m");
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newline(2);
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printf(" This is a telnet server, remember your escape keys!");
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newline(1);
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printf(" \033[1;31m^]quit\033[0m to exit");
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newline(2);
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printf(" Starting in %d... \n", countdown_clock-k);
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fflush(stdout);
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usleep(400000);
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printf("\033[H"); /* Reset cursor */
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fflush(stdout);
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usleep(400000);
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printf("\033[H"); /* Reset cursor */
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}
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/* Clear the screen again */
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printf("\033[H\033[2J\033[?25l");
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}
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/* Clear the screen again */
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printf("\033[H\033[2J\033[?25l");
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/* Store the start time */
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time_t start, current;
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time(&start);
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