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#if 0
set -e
bin=$(dirname $0)
cc -Wall -Wextra -pedantic $@ -o $bin/pbd $0
ln -f $bin/pbd $bin/pbcopy
ln -f $bin/pbd $bin/pbpaste
exit
#endif
// TCP server which pipes between macOS pbcopy and pbpaste, and pbcopy and
// pbpaste implementations which connect to it.
#include <arpa/inet.h>
#include <err.h>
#include <netinet/in.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sysexits.h>
#include <unistd.h>
static void spawn(const char *cmd, int childFd, int parentFd) {
pid_t pid = fork();
if (pid < 0) err(EX_OSERR, "fork");
if (pid) {
int status;
pid_t wait = waitpid(pid, &status, 0);
if (wait < 0) err(EX_OSERR, "waitpid");
if (status) {
warnx("child %s status %d", cmd, status);
}
} else {
int fd = dup2(parentFd, childFd);
if (fd < 0) err(EX_OSERR, "dup2");
int error = execlp(cmd, cmd);
if (error) err(EX_OSERR, "execlp");
}
}
static int pbd(void) {
int error;
int server = socket(PF_INET, SOCK_STREAM, 0);
if (server < 0) err(EX_OSERR, "socket");
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_OSERR, "bind");
error = listen(server, 1);
if (error) err(EX_OSERR, "listen");
for (;;) {
int client = accept(server, NULL, NULL);
if (client < 0) err(EX_OSERR, "accept");
spawn("pbpaste", STDOUT_FILENO, client);
uint8_t p;
ssize_t peek = recv(client, &p, 1, MSG_PEEK);
if (peek < 0) err(EX_IOERR, "recv");
if (peek) {
spawn("pbcopy", STDIN_FILENO, client);
}
error = close(client);
if (error) err(EX_IOERR, "close");
}
}
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_OSERR, "connect");
return client;
}
static void copy(int fdIn, int fdOut) {
char readBuf[4096];
ssize_t readLen;
while (0 < (readLen = read(fdIn, readBuf, sizeof(readBuf)))) {
char *writeBuf = readBuf;
ssize_t writeLen;
while (0 < (writeLen = write(fdOut, writeBuf, readLen))) {
writeBuf += writeLen;
readLen -= writeLen;
}
if (writeLen < 0) err(EX_IOERR, "write");
}
if (readLen < 0) err(EX_IOERR, "read");
}
static int pbcopy(void) {
int client = pbdClient();
copy(STDIN_FILENO, client);
return EX_OK;
}
static int pbpaste(void) {
int client = pbdClient();
int error = shutdown(client, SHUT_WR);
if (error) err(EX_OSERR, "shutdown");
copy(client, STDOUT_FILENO);
return EX_OK;
}
int main(int argc __attribute((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();
}
return EX_USAGE;
}
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