Test of the gettaddrinfo POSIX facility.

Ref #2682

repos/libports/run/libc_getaddrinfo.run

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+source ${genode_dir}/repos/base/run/platform_drv.inc
+
+if {[have_spec linux]} {
+	puts "The [run_name] scenario requires QEMU networking."
+	exit 1
+}
+
+set build_components {
+	core init
+	drivers/timer
+	lib/vfs/lxip
+	test/libc_getaddrinfo
+}
+
+append_platform_drv_build_components
+
+build $build_components
+
+create_boot_directory
+
+append config {
+<config>
+	<parent-provides>
+		<service name="CPU"/>
+		<service name="IO_MEM"/>
+		<service name="IO_PORT"/>
+		<service name="IRQ"/>
+		<service name="LOG"/>
+		<service name="PD"/>
+		<service name="RM"/>
+		<service name="ROM"/>
+	</parent-provides>
+	<default-route>
+		<any-service> <parent/> <any-child/> </any-service>
+	</default-route>
+	<default caps="128"/>}
+
+append_platform_drv_config
+
+append config {
+	<start name="timer">
+		<resource name="RAM" quantum="1M"/>
+		<provides> <service name="Timer"/> </provides>
+	</start>
+	<start name="nic_drv">
+		<binary name="} [nic_drv_binary] {"/>
+		<resource name="RAM" quantum="4M"/>
+		<provides> <service name="Nic"/> </provides>
+	</start>
+
+	<start name="test-libc_getaddrinfo" caps="256">
+		<resource name="RAM" quantum="32M"/>
+		<config>
+			<vfs>
+				<dir name="etc">
+					<inline name="resolv.conf">nameserver 10.0.2.3</inline>
+				</dir>
+				<dir name="dev"> <log/> </dir>
+				<dir name="socket"> <lxip dhcp="yes"/> </dir>
+			</vfs>
+			<libc stdout="/dev/log" socket="/socket"/>
+			<arg value="test-libc_getenv"/>
+			<arg value="genode.org"/>
+			<arg value="hypervisor.org"/>
+			<arg value="example.com"/>
+		</config>
+	</start>
+</config>
+}
+
+install_config $config
+
+set boot_modules {
+	core init ld.lib.so 
+	libc.lib.so libm.lib.so posix.lib.so
+	lxip.lib.so vfs_lxip.lib.so
+	test-libc_getaddrinfo
+	timer
+}
+
+# platform-specific modules
+append_platform_drv_boot_modules
+lappend boot_modules [nic_drv_binary]
+
+build_boot_image $boot_modules
+
+append qemu_args " -nographic -net nic,model=e1000 -net user -net dump,file=[run_dir]/dump.pcap"
+
+run_genode_until "child .* exited with exit value 0.*\n" 20

repos/libports/src/test/libc_getaddrinfo/main.c

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+/*
+ * \brief  Libc getaddrinfo(...) test
+ * \author Emery Hemingway
+ * \date   2018-02-18
+ */
+
+/*
+ * This code lifted from Beej's Guide to Network Programming.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <string.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+
+int main(int argc, char **argv)
+{
+	struct addrinfo hints;
+	char ipstr[INET6_ADDRSTRLEN];
+
+	int i;
+	for (i = 1; i < argc; ++i) {
+		int res;
+		char const *arg = argv[i];
+
+		struct addrinfo *info, *p;
+
+		memset(&hints, 0x00, sizeof(hints));
+		hints.ai_family = AF_UNSPEC;
+
+		res = getaddrinfo(arg, NULL, &hints, &info);
+		if (res != 0) {
+			printf("getaddrinfo error: %d\n", res);
+			continue;
+		}
+
+		for (p = info; p != NULL; p = p->ai_next) {
+			void *addr;
+
+			// get the pointer to the address itself,
+			// different fields in IPv4 and IPv6:
+			if (p->ai_family == AF_INET) { // IPv4
+				struct sockaddr_in *ipv4 = (struct sockaddr_in *)p->ai_addr;
+				addr = &(ipv4->sin_addr);
+			} else { // IPv6
+				struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)p->ai_addr;
+				addr = &(ipv6->sin6_addr);
+			}
+
+			inet_ntop(p->ai_family, addr, ipstr, sizeof ipstr);
+			printf("%s: %s\n", arg, ipstr);
+
+			break;
+		}
+
+		freeaddrinfo(info);
+	}
+
+	return 0;
+}

repos/libports/src/test/libc_getaddrinfo/target.mk

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+TARGET = test-libc_getaddrinfo
+SRC_C  = main.c
+LIBS   = posix