1 files changed, 136 insertions, 0 deletions
diff --git a/bin/pbd.c b/bin/pbd.c
new file mode 100644
index 00000000..80ab036f
--- /dev/null
+++ b/bin/pbd.c
@@ -0,0 +1,136 @@
+/* Copyright (c) 2017, Curtis 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;
+    }
+}