用Qt实现在linux下获得路由器公网IP

#include "widget.h" #include "ui_widget.h" #include <QMessageBox> #include <stdio.h> #include <string.h> #include <sys/types.h> #include <errno.h> #include <sys/stat.h> #include <fcntl.h> #include <unistd.h> #include <stdlib.h> #include <netdb.h> #include <stddef.h> #include <netinet/in.h> #include <arpa/inet.h> #include <sys/socket.h> #define BUF_SIZE 512 int port = 80; Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) { ui->setupUi(this); char url[] = "www.3322.org/dyndns/getip"; if(!this->getPublicIP2(url)) { QMessageBox::warning(this,"WARNING!!!","fail to get public IP!!!!!!!!"); } } Widget::~Widget() { delete ui; } void Widget::getPublicIP(char *url) { struct sockaddr_in pin; struct hostent *nlp_host; int sd = 0; int len = 0; // int i, count = 0; // int recv_start = 0, recv_end = 0; char buf[BUF_SIZE] = { 0 }, myurl[100] = {0}; char host[100] = { 0 }, GET[100] = {0}, header[240] = {0}; char *pHost = 0; ///get the host name and the relative address from url name!!! strcpy(myurl, url); for (pHost = myurl; *pHost != '/' && *pHost != '\0'; ++pHost) ; if ((unsigned int)(pHost - myurl) == strlen(myurl)) strcpy(GET, "/"); else strcpy(GET, pHost); *pHost = '\0'; strcpy(host, myurl); ///setting socket param if ((nlp_host = gethostbyname(host)) == 0) { perror("error get host\n"); exit(1); } bzero(&pin, sizeof(pin)); pin.sin_family = AF_INET; pin.sin_addr.s_addr = htonl(INADDR_ANY); pin.sin_addr.s_addr = ((struct in_addr *)(nlp_host->h_addr))->s_addr; pin.sin_port = htons(port); if ((sd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { perror("Error opening socket!!!\n"); exit(1); } ///together the request info that will be sent to web server ///Note: the blank and enter key byte is necessary,please remember!!! strcat(header, "GET"); strcat(header, " "); strcat(header, GET); strcat(header, " "); strcat(header, "HTTP/1.1\r\n"); strcat(header, "HOST:"); strcat(header, host); strcat(header, "\r\n"); strcat(header, "ACCEPT:*/*"); strcat(header, "\r\nConnection: close\r\n\r\n\r\n"); ///connect to the webserver,send the header,and receive the web sourcecode // if (::connect(sd, (void *)&pin, sizeof(pin)) == -1) if (::connect(sd, (sockaddr *)&pin, sizeof(pin)) == -1) printf("error connect to socket\n"); if (send(sd, header, strlen(header), 0) == -1) { perror("error in send \n"); exit(1); } ///send the message and wait the response!!! len = recv(sd, buf, BUF_SIZE, 0); if (len < 0) printf("receive data error!!!\n"); else { printf("*********************************************************\n"); // char *ppp =NULL; // printf("%d\n",strlen(buf)); printf("%s\n",buf); // ppp = strstr(buf,"10"); // printf("%s\n",ppp); // //// printf("%s\n", &(buf[157])); printf("*********************************************************\n"); printf("%s\n",strstr(buf,"utf-8")+9); char ipbuf[30] = ""; sscanf(strstr(buf,"utf-8")+9,"%*[^\n]\n%[^\n]",ipbuf); printf("*********************************************************\n"); printf("ip = %s\n",ipbuf); printf("*********************************************************\n"); // printf("%s\n",buf+202); // printf("*********************************************************\n"); ui->textEdit->setText(QString(ipbuf)); } ::close(sd); } void Widget::on_pushButton_clicked() { char url[] = "www.3322.org/dyndns/getip"; if(!this->getPublicIP2(url)) { QMessageBox::warning(this,"WARNING!!!","fail to get public IP!!!!!!!!"); } } bool Widget::getPublicIP2(char *url) { struct sockaddr_in pin; struct hostent *nlp_host; int sd = 0; int len = 0; char buf[BUF_SIZE] = { 0 }; char myurl[100] = {0}; char host[100] = { 0 }; char GET[100] = {0}; char header[240] = {0}; char *pHost = 0; ///get the host name and the relative address from url name!!! strcpy(myurl, url); for (pHost = myurl; *pHost != '/' && *pHost != '\0'; ++pHost) ; if ((unsigned int)(pHost - myurl) == strlen(myurl)) strcpy(GET, "/"); else strcpy(GET, pHost); *pHost = '\0'; strcpy(host, myurl); ///setting socket param if ((nlp_host = gethostbyname(host)) == 0) { perror("error get host\n"); return false; } bzero(&pin, sizeof(pin)); pin.sin_family = AF_INET; pin.sin_addr.s_addr = htonl(INADDR_ANY); pin.sin_addr.s_addr = ((struct in_addr *)(nlp_host->h_addr))->s_addr; pin.sin_port = htons(port); if ((sd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { perror("Error opening socket!!!\n"); return false; } ///together the request info that will be sent to web server ///Note: the blank and enter key byte is necessary,please remember!!! strcat(header, "GET"); strcat(header, " "); strcat(header, GET); strcat(header, " "); strcat(header, "HTTP/1.1\r\n"); strcat(header, "HOST:"); strcat(header, host); strcat(header, "\r\n"); strcat(header, "ACCEPT:*/*"); strcat(header, "\r\nConnection: close\r\n\r\n\r\n"); ///connect to the webserver,send the header,and receive the web sourcecode // if (::connect(sd, (void *)&pin, sizeof(pin)) == -1) if (::connect(sd, (sockaddr *)&pin, sizeof(pin)) == -1) { ::close(sd); printf("error connect to socket\n"); return false; } if (send(sd, header, strlen(header), 0) == -1) { ::close(sd); perror("error in send \n"); return false; } ///send the message and wait the response!!! len = recv(sd, buf, BUF_SIZE, 0); if (len < 0) { ::close(sd); printf("receive data error!!!\n"); return false; } else { char ipbuf[30] = ""; sscanf(strstr(buf,"utf-8")+9,"%*[^\n]\n%[^\n]",ipbuf); printf("ip = %s\n",ipbuf); ui->textEdit->setText(QString(ipbuf)); ::close(sd); return true; } }