add missing .c files for ares integration

src/ares.c

@@ -0,0 +1,62 @@
+#include <string.h>
+#include <ares.h>
+
+#include <osmocom/core/logging.h>
+#include <osmocom/core/utils.h>
+
+ares_channel osmo_ares_channel;
+
+struct value_string ares_status_strs[25] = {
+	/* Server error codes */
+	{ ARES_SUCCESS,		"Success" },
+	{ ARES_ENODATA,		"Server: No relevant answer" },
+	{ ARES_ESERVFAIL,	"Server: Server failure" },
+	{ ARES_ENOTFOUND,	"Server: Not found" },
+	{ ARES_ENOTIMP,		"Server: Not implemented" },
+	{ ARES_EREFUSED,	"Server: Refused" },
+	/* Locally generated error codes */
+	{ ARES_EBADQUERY,	"Local: Bad Query" },
+	{ ARES_EBADNAME,	"Local: Bad Name" },
+	{ ARES_EBADFAMILY,	"Local: Bad Family" },
+	{ ARES_EBADRESP,	"Local: Bad Response" },
+	{ ARES_ECONNREFUSED,	"Local: Connection refused" },
+	{ ARES_ETIMEOUT,	"Local: Timeout" },
+	{ ARES_EOF,		"Local: End of file" },
+	{ ARES_EFILE,		"Local: EFILE?" },
+	{ ARES_ENOMEM,		"Local: Out of memory" },
+	{ ARES_EDESTRUCTION,	"Local: Destruction?" },
+	{ ARES_EBADSTR,		"Local: Bad String?" },
+	{ ARES_EBADFLAGS,	"genameinfo: Bad flags" },
+	{ ARES_ENONAME,		"getaddrinfo: No name" },
+	{ ARES_EBADHINTS,	"getaddrinfo: Bad Hints" },
+	{ ARES_ENOTINITIALIZED,	"Library not initialized" },
+	{ ARES_ELOADIPHLPAPI,	"?" },
+	{ ARES_EADDRGETNETWORKPARAMS, "?" },
+	{ ARES_ECANCELLED,	"Cancelled" },
+	{ 0, NULL }
+};
+
+int osmo_ares_init()
+{
+	struct ares_options options;
+	unsigned int optmask = 0;
+	int rc;
+
+	memset(&options, 0, sizeof(options));
+
+	rc = ares_library_init(ARES_LIB_INIT_ALL);
+	if (rc != ARES_SUCCESS) {
+		LOGP(DLGLOBAL, LOGL_ERROR, "ares_library_init(): %s\n",
+		     ares_strerror(rc));
+		return -1;
+	}
+
+	rc = ares_init_options(&osmo_ares_channel, &options, optmask);
+	if (rc != ARES_SUCCESS) {
+		LOGP(DLGLOBAL, LOGL_ERROR, "ares_init_options(): %s\n",
+		     ares_strerror(rc));
+		return -1;
+	}
+
+	return 0;
+}

tests/ares/ares_test.c

@@ -0,0 +1,50 @@
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <netdb.h>
+#include <ares.h>
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <osmocom/core/select.h>
+
+extern ares_channel osmo_ares_channel;
+
+
+static void ares_cb(void *arg, int status, int timeouts, struct hostent *hostent)
+{
+	struct in_addr *ia;
+	int i;
+
+	printf("Callback called: status=%d, timeouts=%d\n", status, timeouts);
+
+	if (status != ARES_SUCCESS)
+		return;
+
+	if (hostent->h_length != sizeof(struct in_addr))
+		return;
+
+	for (i = 0, ia = (struct in_addr *) hostent->h_addr_list[i]; ia;
+	     i++, ia = (struct in_addr *) hostent->h_addr_list[i]) {
+		printf("%s -> %s\n", hostent->h_name, inet_ntoa(*ia));
+	}
+
+	exit(0);
+}
+
+int main(int argc, char **argv)
+{
+	osmo_ares_init();
+
+	ares_gethostbyname(osmo_ares_channel, "localhost", AF_INET,
+			   ares_cb, NULL);
+
+	while (1) {
+		osmo_select_main(0);
+	}
+
+	exit(1);
+}