ip.c

#include <stdio.h>
#include <string.h>
#include <gio/gio.h>
#include "ip.h"

static gchar *get_addr()
{
    g_type_init();
    GSocketClient *client = g_socket_client_new();
    GSocketConnection *c = g_socket_client_connect_to_uri(
        client, "http://cip.cc", 80, NULL, NULL);
    if (c) {
        GSocket *socket = NULL;
        g_object_get(c, "socket", &socket, NULL);
        if (socket) {
            char buf[2048] = {0};
            char *str = g_malloc0(1024);
            char *p, *q;
            char *send = "GET / HTTP/1.1\r\nUser-Agent: curl/7.29.0\r\nHost: cip.cc\r\nAccept: */*\r\n\r\n";
            g_socket_send(socket, send, strlen(send) + 1, NULL, NULL);
            g_socket_receive(socket, buf, sizeof(buf), NULL, NULL);
            p = strstr(buf, "IP");
            q = strstr(p, "\n");
            if (p && q) {
                char ip[32] = {0};
                snprintf(ip, q - p + 2, "%s", p);
                strcat(str, ip);
            }

            p = strstr(buf, "地址");
            q = strstr(p, "\n");
            if (p && q) {
                char addr[1024] = {0};
                snprintf(addr, q - p + 2, "%s", p);
                strcat(str, addr);
            }
            g_socket_close(socket, NULL);
            return str;
        }
    }
    g_object_unref(client);
    return NULL;
}

JNIEXPORT jstring JNICALL Java_org_mathslinux_glib_1demo_GetIPAddr_getAddr
(JNIEnv *je, jclass jc)
{
    char *addr = get_addr();
    return (*je)->NewStringUTF(je, addr);
}