From ee442870809ebfd9eefd8868314cafa5c001d925 Mon Sep 17 00:00:00 2001
From: Curtis McEnroe <curtis.mcenroe@adgear.com>
Date: Fri, 6 Jan 2017 11:49:29 -0500
Subject: Implement pbcopy and pbpaste in C

Ted Unangst broke my netcat implementation of pbpaste with this commit:
<https://github.com/openbsd/src/commit/bb978d8>, which, when /dev/null
is attached to stdin, causes nc to exit and never read from the socket.

Turns out the core functionality of netcat can be implemented in about
50 lines of C.
---
 .bin/pbcopy.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100755 .bin/pbcopy.c

(limited to '.bin/pbcopy.c')

diff --git a/.bin/pbcopy.c b/.bin/pbcopy.c
new file mode 100755
index 00000000..37c334ca
--- /dev/null
+++ b/.bin/pbcopy.c
@@ -0,0 +1,52 @@
+#if 0
+cc -Wall -Wextra -pedantic $@ -o $(dirname $0)/pbcopy $0 && \
+exec cc -Wall -Wextra -pedantic -DPBPASTE $@ -o $(dirname $0)/pbpaste $0
+#endif
+
+#include <arpa/inet.h>
+#include <err.h>
+#include <stdio.h>
+#include <sys/socket.h>
+#include <sysexits.h>
+#include <unistd.h>
+
+int main() {
+    int error;
+
+    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) },
+    };
+
+    error = connect(client, (struct sockaddr *)&addr, sizeof(addr));
+    if (error) err(EX_OSERR, "connect");
+
+#ifdef PBPASTE
+    int fdIn = client;
+    int fdOut = STDOUT_FILENO;
+    error = shutdown(client, SHUT_WR);
+    if (error) err(EX_OSERR, "shutdown");
+#else
+    int fdIn = STDIN_FILENO;
+    int fdOut = client;
+#endif
+
+    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");
+
+    return 0;
+}
-- 
cgit 1.4.1