93 lines
2.9 KiB
C
93 lines
2.9 KiB
C
/* Name: homeipd.c
|
|
Desc: a server program coupled with the client program homeipc.c
|
|
location: /usr/bin/
|
|
conf file: /etc/homeipd.conf
|
|
output file: /var/www/website/homeip.txt
|
|
Version: 0.2
|
|
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 <sys/stat.h>
|
|
#include <fcntl.h>
|
|
|
|
|
|
/* 1. Read in the canonical string lines in the config file /etc/homeipd.conf file to
|
|
the array homeids[128, 256], and check the output file /var/www/website/homeip.txt.
|
|
If the config file does not exists, 10 default strings will be used:
|
|
"My_home_ip_please_00" to "My_home_ip_please_10".
|
|
The output file /var/www/website/homeip.txt will be created if it does not exist.
|
|
2. Establish network link and listen to the port 55535. If a message string is received,
|
|
it is compared with the strings in array homeids[]. If the received string is actually
|
|
contained in the string array homeids[], then the link's source IP will be obtained
|
|
and stored in the output file with the string in a line.
|
|
*/
|
|
|
|
// Get Home IP -- GHI_
|
|
#define GHI_PORT 55535
|
|
#define GHI_STR "My_home_ip_please_00"
|
|
#define GHI_OUT_FILE "/var/www/homepage/oldlinux.org/homeip.txt"
|
|
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
socklen_t len;
|
|
int listenfd, connfd, n;
|
|
char buff[4096], buff1[4096];
|
|
struct sockaddr_in servaddr, cliaddr;
|
|
time_t ticks;
|
|
int outfd;
|
|
|
|
listenfd = socket(AF_INET, SOCK_STREAM, 0);
|
|
bzero(&servaddr, sizeof(servaddr));
|
|
servaddr.sin_family = AF_INET;
|
|
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
|
|
servaddr.sin_port = htons(GHI_PORT);
|
|
|
|
bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
|
|
listen(listenfd, 1024);
|
|
|
|
for (;;) {
|
|
len = sizeof(cliaddr);
|
|
connfd = accept(listenfd, (struct sockaddr *)&cliaddr, &len);
|
|
if (( n = read(connfd, buff, 4097)) > 0) { // while
|
|
buff[n] = 0;
|
|
// printf("Received String: %s, %d %d\r\n", buff, n, sizeof(GHI_STR));
|
|
if ( !strncmp(GHI_STR, buff, n)) {
|
|
// printf( "%s, %s\n", buff,
|
|
// inet_ntop(AF_INET, &cliaddr.sin_addr, buff1, sizeof(buff1)));
|
|
if ((outfd = open(GHI_OUT_FILE, O_WRONLY | O_CREAT | O_APPEND,
|
|
S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) == -1) {
|
|
printf("Error open file: %s.\n", GHI_OUT_FILE);
|
|
exit(1);
|
|
}
|
|
else {
|
|
inet_ntop(AF_INET, &cliaddr.sin_addr, buff1, sizeof(buff1));
|
|
ticks = time(NULL);
|
|
sprintf(buff, "%s, %.24s, %s\n", buff, ctime(&ticks), buff1);
|
|
write(outfd, buff, strlen(buff));
|
|
close(outfd);
|
|
}
|
|
}
|
|
close(connfd);
|
|
}
|
|
else close(connfd);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|