Userland: Add a simple utility for UDP testing.

Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/ea6a537b707

Kernel/sync.sh

@@ -75,6 +75,7 @@ cp -v ../Userland/su mnt/bin/su
 cp -v ../Userland/env mnt/bin/env
 cp -v ../Userland/stat mnt/bin/stat
 cp -v ../Userland/ping mnt/bin/ping
+cp -v ../Userland/uc mnt/bin/uc
 chmod 4755 mnt/bin/su
 cp -v ../Applications/Terminal/Terminal mnt/bin/Terminal
 cp -v ../Applications/FontEditor/FontEditor mnt/bin/FontEditor

Userland/.gitignore

@@ -38,3 +38,4 @@ env
 chown
 stat
 ping
+uc

Userland/Makefile

@@ -34,6 +34,7 @@ OBJS = \
        env.o \
        stat.o \
        ping.o \
+       uc.o \
        rm.o
 
 APPS = \
@@ -73,6 +74,7 @@ APPS = \
        env \
        stat \
        ping \
+       uc \
        rm
 
 ARCH_FLAGS =
@@ -203,6 +205,10 @@ stat: stat.o
 ping: ping.o
 	$(LD) -o $@ $(LDFLAGS) $< -lc
 
+uc: uc.o
+	$(LD) -o $@ $(LDFLAGS) $< -lc
+
+
 .cpp.o:
 	@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
 

Userland/uc.cpp

@@ -0,0 +1,53 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+
+int main(int argc, char** argv)
+{
+    (void)argc;
+    (void)argv;
+
+    int fd = socket(AF_INET, SOCK_DGRAM, 0);
+    if (fd < 0) {
+        perror("socket");
+        return 1;
+    } 
+
+    struct timeval timeout { 5, 0 };
+    int rc = setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
+    if (rc < 0) {
+        perror("setsockopt");
+        return 1;
+    }
+
+    struct sockaddr_in dst_addr;
+    memset(&dst_addr, 0, sizeof(dst_addr));
+
+    dst_addr.sin_family = AF_INET;
+    dst_addr.sin_port = htons(8080);
+    dst_addr.sin_addr.s_addr = INADDR_ANY;
+
+    char buffer[BUFSIZ];
+    const char* msg = "Test message";
+
+    sendto(fd, (const char *)msg, strlen(msg), 0,(const struct sockaddr *)&dst_addr, sizeof(dst_addr));
+    printf("Message sent.\n");
+
+    struct sockaddr_in src_addr;
+    socklen_t src_addr_len = sizeof(src_addr);
+    ssize_t nrecv = recvfrom(fd, (char *)buffer, sizeof(buffer), 0, (struct sockaddr*)&src_addr, &src_addr_len);
+    if (nrecv < 0) {
+        perror("recvfrom");
+        return 1;
+    }
+    buffer[nrecv] = '\0';
+    printf("Server: %s\n", buffer);
+
+    close(fd);
+    return 0;
+}