Mark
130 lines
2.9 KiB
C
130 lines
2.9 KiB
C
#include <sys/select.h>
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#include <termios.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdio.h>
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#define OPT_HEX (1 << 0)
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static void usage(char **argv) {
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fprintf(stderr, "usage: %s [-x] DEVICE\n", argv[0]);
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}
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int main(int argc, char **argv) {
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struct termios tc0r, tc1r, tc0l, tc1l;
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int flags = 0;
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int fd, res;
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ssize_t bread;
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struct timeval tv;
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char buf[1024];
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fd_set fds;
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static const char *opts = "x";
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char c;
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while ((c = getopt(argc, argv, opts)) != -1) {
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switch (c) {
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case 'x':
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flags |= OPT_HEX;
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break;
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case '?':
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usage(argv);
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return -1;
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}
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}
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if (optind != argc - 1) {
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usage(argv);
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return -1;
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}
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// Setup local terminal
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if (tcgetattr(STDIN_FILENO, &tc0l) != 0) {
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perror("get local termios");
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return -1;
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}
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tc1l = tc0l;
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tc1l.c_lflag &= ~ICANON;
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if (tcsetattr(STDIN_FILENO, TCSANOW, &tc1l) != 0) {
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perror("set local termios");
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return -1;
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}
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if ((fd = open(argv[optind], O_RDWR, 0)) < 0) {
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perror(argv[optind]);
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goto cleanup_local;
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}
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// Setup remote terminal
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if (tcgetattr(fd, &tc0r) != 0) {
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perror("get remote termios");
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goto cleanup_local;
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}
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tc1r = tc0r;
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tc1r.c_lflag &= ~ICANON;
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if (tcsetattr(fd, TCSANOW, &tc1r) != 0) {
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perror("set remote termios");
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goto cleanup_local;
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}
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while (1) {
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FD_ZERO(&fds);
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FD_SET(STDIN_FILENO, &fds);
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FD_SET(fd, &fds);
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tv.tv_sec = 1;
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tv.tv_usec = 0;
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res = select(fd + 1, &fds, NULL, NULL, &tv);
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if (res < 0) {
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perror("select()");
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goto cleanup_remote;
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}
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if (res == 0) {
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continue;
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}
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if (FD_ISSET(fd, &fds)) {
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bread = read(fd, buf, sizeof(buf));
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if (bread <= 0) {
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break;
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}
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if (!(flags & OPT_HEX)) {
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write(STDOUT_FILENO, buf, bread);
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} else {
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for (ssize_t i = 0; i < bread; ++i) {
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printf("%02hhx", buf[i]);
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}
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fflush(stdout);
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}
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}
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if (FD_ISSET(STDIN_FILENO, &fds)) {
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bread = read(STDIN_FILENO, buf, sizeof(buf));
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int brk = 0;
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if (bread <= 0) {
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break;
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}
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size_t count = 0;
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for (ssize_t i = 0; i < bread; ++i) {
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if (buf[i] == 0x04) {
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// EOF
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brk = 1;
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break;
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}
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++count;
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}
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write(fd, buf, count);
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if (brk) {
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break;
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}
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}
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}
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cleanup_remote:
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tcsetattr(STDIN_FILENO, TCSANOW, &tc0r);
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cleanup_local:
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tcsetattr(STDIN_FILENO, TCSANOW, &tc0l);
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return 0;
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}
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