Created
February 16, 2014 20:28
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C program to send remote commands to TTY1 over ssh
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| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <fcntl.h> | |
| #include <sys/stat.h> | |
| #include <sys/ioctl.h> | |
| #include <string.h> | |
| #include <unistd.h> | |
| void print_help(char *prog_name) { | |
| printf("Usage: %s [-n] DEVNAME COMMAND\n", prog_name); | |
| printf("Usage: '-n' is an optional argument if you want to push a new line at the end of the text\n"); | |
| printf("Usage: Will require 'sudo' to run if the executable is not setuid root\n"); | |
| exit(1); | |
| } | |
| int main (int argc, char *argv[]) { | |
| char *cmd, *nl = "\n"; | |
| int i, fd; | |
| int devno, commandno, newline; | |
| int mem_len; | |
| devno = 1; commandno = 2; newline = 0; | |
| if (argc < 3) { | |
| print_help(argv[0]); | |
| } | |
| if (argc > 3 && argv[1][0] == '-' && argv[1][1] == 'n') { | |
| devno = 2; commandno = 3; newline=1; | |
| } else if (argc > 3 && argv[1][0] == '-' && argv[1][1] != 'n') { | |
| printf("Invalid Option\n"); | |
| print_help(argv[0]); | |
| } | |
| fd = open(argv[devno],O_RDWR); | |
| if(fd == -1) { | |
| perror("open DEVICE"); | |
| exit(1); | |
| } | |
| mem_len = 0; | |
| for ( i = commandno; i < argc; i++ ) { | |
| mem_len += strlen(argv[i]) + 2; | |
| if ( i > commandno ) { | |
| cmd = (char *)realloc((void *)cmd, mem_len); | |
| } else { //i == commandno | |
| cmd = (char *)malloc(mem_len); | |
| } | |
| strcat(cmd, argv[i]); | |
| strcat(cmd, " "); | |
| } | |
| if (newline == 0) | |
| usleep(225000); | |
| for (i = 0; cmd[i]; i++) | |
| ioctl (fd, TIOCSTI, cmd+i); | |
| if (newline == 1) | |
| ioctl (fd, TIOCSTI, nl); | |
| close(fd); | |
| free((void *)cmd); | |
| exit (0); | |
| } |
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