From 42a2a579628d4aa8153775cdcd894b8b5c80e7da Mon Sep 17 00:00:00 2001
From: Mattias Andrée <m@maandree.se>
Date: Thu, 6 Feb 2025 20:08:50 +0100
Subject: m + libradharc for client-side protocol implementation
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Signed-off-by: Mattias Andrée <m@maandree.se>
---
 radharc-ipc.c | 50 ++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 36 insertions(+), 14 deletions(-)

(limited to 'radharc-ipc.c')

diff --git a/radharc-ipc.c b/radharc-ipc.c
index 83f436f..3787d2d 100644
--- a/radharc-ipc.c
+++ b/radharc-ipc.c
@@ -11,11 +11,13 @@
 #include <string.h>
 #include <unistd.h>
 
+#include "libradharc.h"
+
 USAGE("[-R rule] (pid | @name | &fd | address) ...");
 
 
 struct message {
-	char *text;
+	void *text;
 	size_t len;
 };
 
@@ -46,7 +48,7 @@ main(int argc, char *argv[])
 	size_t i, j;
 	struct sockaddr_un addr;
 	size_t addrlen;
-	int sock;
+	int sock, *socks;
 	struct message *messages = NULL;
 	size_t nmessages = 0;
 
@@ -70,9 +72,24 @@ main(int argc, char *argv[])
 	if (!addresses)
 		goto fail;
 
+	sock = socket(PF_UNIX, SOCK_DGRAM, 0);
+	if (sock < 0)
+		goto fail;
+
+	/* we need an address, otherwise the peer will not get an address to send the response to */
+        memset(&addr, 0, sizeof(addr));
+        addr.sun_family = AF_UNIX;
+        if (bind(sock, (void *)&addr, (socklen_t)offsetof(struct sockaddr_un, sun_path)))
+		goto fail;
+
+	socks = calloc((size_t)argc, sizeof(int));
+	if (!socks)
+		goto fail;
+
 	for (i = 0; i < (size_t)argc; i++) {
 		const char *arg = argv[i];
 		uintmax_t num;
+		socks[i] = sock;
 		if (*arg == '@' || strchr(arg, '/')) {
 			addresses[i] = strdup(arg);
 			if (addresses[i])
@@ -83,11 +100,8 @@ main(int argc, char *argv[])
 			if (*arg == '&') {
 				if (num > (uintmax_t)INT_MAX)
 					usage();
-				/* TODO whoops, this should be send with that fd, not to it */
-				addresses[i] = malloc(sizeof("/proc/self/fd/") + strlen(&arg[1]));
-				if (!addresses[i])
-					goto fail;
-				stpcpy(stpcpy(addresses[i], "/proc/self/fd/"), &arg[1]);
+				addresses[i] = NULL;
+				socks[i] = (int)num;
 			} else {
 				addresses[i] = malloc(sizeof("@/proc//") + strlen(arg) + strlen(class));
 				if (!addresses[i])
@@ -105,15 +119,11 @@ main(int argc, char *argv[])
 		}
 	}
 
-	sock = socket(PF_UNIX, SOCK_DGRAM, 0);
-	if (sock < 0)
-		goto fail;
-
 	for (j = 0; j < nmessages; j++) {
 		for (i = 0; i < (size_t)argc; i++) {
 			size_t len;
 
-			if (!addresses[i])
+			if (socks[i] < 0)
 				continue;
 
 			len = strlen(&addresses[i][1]) + 1U;
@@ -122,15 +132,26 @@ main(int argc, char *argv[])
 			memcpy(addr.sun_path, addresses[i], len);
 			addrlen = offsetof(struct sockaddr_un, sun_path) + len;
 
-			if (sendto(sock, messages[j].text, messages[j].len, MSG_NOSIGNAL,
+			if (socks[i] != sock) {
+				if (send(socks[i], messages[j].text, messages[j].len, MSG_NOSIGNAL) < 0)
+					goto send_failed;
+			} else if (sendto(sock, messages[j].text, messages[j].len, MSG_NOSIGNAL,
 			           (void *)&addr, (socklen_t)addrlen) < 0) {
+			send_failed:
 				fprintf(stderr, "%s: error while sending to '%s': %s\n",
 				        argv0, argv[i], strerror(errno));
 				ret = 1;
-				addresses[i] = NULL;
+				socks[i] = -1;
 			}
 		}
 		free(messages[j].text);
+
+		for (i = 0; i < (size_t)argc; i++) {
+			if (socks[i] < 0)
+				continue;
+
+			/* TODO get response */
+		}
 	}
 
 	close(sock);
@@ -140,6 +161,7 @@ main(int argc, char *argv[])
 	free(addresses);
 	free(messages);
 	free(class);
+	free(socks);
 	return ret;
 
 fail:
-- 
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