115 lines
3.8 KiB
C
115 lines
3.8 KiB
C
// KISSY (Kissing Interface for Sapphic Smooching over ttY) v1.2
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/*
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Copyright (C) 2025 Magdalunaa <magdalunaa@linuxposting.xyz>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <string.h>
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#include <pwd.h>
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#include <stdbool.h>
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#include <ctype.h>
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// mreowww meow nya :3
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int main (int argc, char **argv) {
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// print help
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if (argc < 2 || strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-h") == 0) {
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printf("%s\n", "Usage: kissy [target] <message>\n\n"
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"Kissy is a utility that allows you to kiss currently logged in users who allow messages.\n"
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"It works by writing to files in /dev/pts. It needs to run as the group who owns said files (usually tty), using setgid (2755 permissions).");
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return 0;
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}
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// are we running with setgid?
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struct stat stat_self;
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stat("/proc/self/exe", &stat_self);
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if (!(stat_self.st_mode & S_ISGID && !(stat_self.st_mode & S_IWOTH))) {
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printf("%s\n", "setgid is not set, or this file is world writable.");
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return 3;
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}
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// try to find the target's uid
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struct passwd *pw = getpwnam(argv[1]);
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if (pw == NULL) {
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printf("%s\n", "Cannot find target");
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return 1;
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}
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uid_t target = pw->pw_uid;
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// get current username
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struct passwd *pw2 = getpwuid(getuid());
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if (pw == NULL) {
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printf("%s\n", "Cannot find user");
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return 2;
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}
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char* user = pw2->pw_name;
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// if we have a second argument, set a custom kiss message
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char kiss[32] = "*mwah*";
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if (argc >= 3) {
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int len = strlen(argv[2]);
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int written_chars = 0;
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for (int i = 0; i < len; i++) {
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if (written_chars >= 31) {
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kiss[31] = '\0';
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break;
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};
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if (iscntrl(argv[2][i])) continue;
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kiss[i] = argv[2][i];
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written_chars++;
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}
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}
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bool kissed = false;
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// iterate over all files in directory
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DIR *dir = opendir("/dev/pts");
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while (1) {
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struct dirent *ent = readdir(dir);
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if (ent == NULL)
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break;
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char filepath[strlen("/dev/pts/") + strlen(ent->d_name) + 1];
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strcpy(filepath, "/dev/pts/");
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strcat(filepath, ent->d_name);
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struct stat stats;
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stat (filepath, &stats);
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// find all terminals with the correct user and that are group-writable
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if (stats.st_mode & S_IWGRP && stats.st_uid == target) {
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kissed = true;
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if (stats.st_gid != getegid()) { // are we running as the tty user?
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fprintf(stderr, "%s\n", "Mismatch between file owner group and current effective group. Make sure this program is running with setgid.");
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} else {
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FILE *tty = fopen(filepath, "a"); // write to terminal!
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fprintf(tty, "\a\n%s\n--%s\n", kiss, user);
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fclose(tty);
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}
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}
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}
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// print a message if a suitable terminal couldn't be found
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if (!kissed)
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fprintf(stderr, "%s\n", "Couldn't find any suitable terminals. User is not logged in or has not enabled messages.");
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}
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