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/* Copyright (c) 2017, June McEnroe <programble@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <arpa/inet.h>
#include <err.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sysexits.h>
#include <unistd.h>
#define UNUSED __attribute__((unused))
static void spawn(const char *cmd, int dest, int src) {
pid_t pid = fork();
if (pid < 0) err(EX_OSERR, "fork");
if (pid) {
int status;
pid_t dead = waitpid(pid, &status, 0);
if (dead < 0) err(EX_OSERR, "waitpid(%d)", pid);
if (status) warnx("%s: status %d", cmd, status);
} else {
int fd = dup2(src, dest);
if (fd < 0) err(EX_OSERR, "dup2");
execlp(cmd, cmd, NULL);
err(EX_UNAVAILABLE, "%s", cmd);
}
}
static int pbd(void) {
int error;
int server = socket(PF_INET, SOCK_STREAM, 0);
if (server < 0) err(EX_OSERR, "socket");
error = fcntl(server, F_SETFD, FD_CLOEXEC);
if (error) err(EX_IOERR, "fcntl");
struct sockaddr_in addr = {
.sin_family = AF_INET,
.sin_port = htons(7062),
.sin_addr = { .s_addr = htonl(0x7F000001) },
};
error = bind(server, (struct sockaddr *)&addr, sizeof(addr));
if (error) err(EX_UNAVAILABLE, "bind");
error = listen(server, 0);
if (error) err(EX_UNAVAILABLE, "listen");
for (;;) {
int client = accept(server, NULL, NULL);
if (client < 0) err(EX_IOERR, "accept");
error = fcntl(client, F_SETFD, FD_CLOEXEC);
if (error) err(EX_IOERR, "fcntl");
spawn("pbpaste", STDOUT_FILENO, client);
char p;
ssize_t peek = recv(client, &p, 1, MSG_PEEK);
if (peek < 0) err(EX_IOERR, "recv");
if (peek) spawn("pbcopy", STDIN_FILENO, client);
close(client);
}
}
static int pbdClient(void) {
int client = socket(PF_INET, SOCK_STREAM, 0);
if (client < 0) err(EX_OSERR, "socket");
struct sockaddr_in addr = {
.sin_family = AF_INET,
.sin_port = htons(7062),
.sin_addr = { .s_addr = htonl(0x7F000001) },
};
int error = connect(client, (struct sockaddr *)&addr, sizeof(addr));
if (error) err(EX_UNAVAILABLE, "connect");
return client;
}
static void copy(int out, int in) {
char buf[4096];
ssize_t readSize;
while (0 < (readSize = read(in, buf, sizeof(buf)))) {
ssize_t writeSize = write(out, buf, readSize);
if (writeSize < 0) err(EX_IOERR, "write(%d)", out);
if (writeSize < readSize) errx(EX_IOERR, "short write(%d)", out);
}
if (readSize < 0) err(EX_IOERR, "read(%d)", in);
}
static int pbcopy(void) {
int client = pbdClient();
copy(client, STDIN_FILENO);
return EX_OK;
}
static int pbpaste(void) {
int client = pbdClient();
shutdown(client, SHUT_WR);
copy(STDOUT_FILENO, client);
return EX_OK;
}
int main(int argc UNUSED, char *argv[]) {
if (!argv[0][0] || !argv[0][1]) return EX_USAGE;
switch (argv[0][2]) {
case 'd': return pbd();
case 'c': return pbcopy();
case 'p': return pbpaste();
default: return EX_USAGE;
}
}
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