initial version

homeip/homeipc.c

@@ -0,0 +1,68 @@
+/* Name:	homeipc.c
+   Desc:	a client program coupled with the server program homeipd.c
+   location:	/usr/bin/
+   conf file:	/etc/homeipc.conf
+   Version:	0.1
+   Jiong.zhao@tongji.edu.cn
+   2017.11.13
+*/
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <time.h>
+#include <netinet/in.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <arpa/inet.h>
+#include <stdlib.h>
+#include <string.h>
+#include <netdb.h>
+
+/* 1. Read in the cananical string line in the config file /etc/homeipc.conf file.
+      If the config file does not exists, the following default string will be used:
+      "My_home_ip_please_00". 
+   2. Build the connection socket, and send the string with port 55535 by TCP or UDP.
+*/
+
+// Get Home IP -- GHI_
+#define GHI_SRV_ADDR	"192.168.1.18"             //oldlinux.org: "139.162.99.40"
+#define GHI_SRV_NAME	"oldlinux.org"
+#define GHI_PORT	55535       
+#define GHI_STR		"My_home_ip_please_00"
+
+int main(int argc, char **argv)
+{
+        int sockfd, n;
+        char    buff[4097];
+        struct  sockaddr_in servaddr;
+	struct 	hostent *hptr;
+	char	**pptr;
+	char    str[16];
+
+        if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
+                exit(1);
+        bzero(&servaddr, sizeof(servaddr));
+        servaddr.sin_family = AF_INET;
+        servaddr.sin_port = htons(GHI_PORT);
+
+	if ((hptr = gethostbyname(GHI_SRV_NAME)) == NULL) {
+        	printf("gethostbyname() error\r\n");
+	}
+	pptr = hptr->h_addr_list; 
+	inet_ntop(AF_INET,*pptr, str, sizeof(str)); 
+	if (inet_pton(AF_INET, str, &servaddr.sin_addr) <=0)
+                exit(1);
+
+        if (connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr))<0)
+                exit(1);
+
+        snprintf(buff, sizeof(buff), "%s", GHI_STR);
+//	printf("%s\r\n", buff);
+        write(sockfd, buff, strlen(buff));
+        close(sockfd);
+
+        exit(0);
+}
+