Linux上的一个简单的多人聊天室

在互联网上聊天对很多“网虫”来说已经是家常便饭了。聊天室程序可以说是网上最简单的多点通信程序。

花了很长时间用来联系掌握Linux 上Socket的一个聊天室程序，可以

点击这里下载Linux上的一个简单的多人聊天室 源代码

/*
 *i.h is a used for creating a library
 *for server client
 *Mar 18 2010 
 *
 */
#ifndef _I_H

#define _I_H

#include <math.h>
#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <inttypes.h>
#include <time.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <signal.h>
#include <ncurses.h>
#include <math.h>

#define SEVR_IP     "127.0.0.1"
#define SEVR_PORT   8081
#define CNTNT_LEN   150
#define MSG_LEN     sizeof(struct msg)
#define ADDR_LEN    sizeof(struct sockaddr)
#define USR_LEN     sizeof(struct user)
#define PRT_LEN     8
#define HSTR_LEN    sizeof(struct chat_history)

/* declare Global variables */
int mainfd;/* used as chat histroy file handle*/
int sockfd;/* used as socket local handle */
int count;
struct sockaddr_in server;

/* msg is used for communicating message */
struct msg
{
 int flag; /* flag meaning:1,ordinary; 2,log msg; 3,reg msg, other,file*/
 int id_from;
 int id_to;
 char content[CNTNT_LEN];
 char append[10];
};

/* user is used information list */
struct user
{
 int id;
 char name[10];
 char password[10];
 char *p_chatlog;
 struct sockaddr user_addr; 
};
/* chat_history used for reading chat history */
struct chat_history
{
 char content[CNTNT_LEN];
 char time[25];
 int to;
 int from;
 int count;
};

/* i_functions below is funtions needed by both client and sever */
extern int i_saveto_chat(struct msg *pmsg);

int i_clean_stdin ()
{
 while ('\n' == getchar())
 {
  continue;
 }

 return(0);
}

int i_print(char *pmsg, int size)
{
 int i = 1;

 for (i; i<= size; i++)
 {
  if (*pmsg != '\n')
  {
   printf("%c", *pmsg);
   pmsg ++;
  }
  else
  {
   return(0);
  }
 }

 return(0);
}
int i_input(char *p_input)
{
 char c = '\0';
 int i; 

 for (i = 0; i < CNTNT_LEN; i++)
 {
  p_input[i] = getchar();
  if (p_input[i] =='\n')
  {
   return(0);  
  }  
 }

 printf("you have input long enough!\n");
 return(0);
}
int i_socket(int domain, int type, int protocol)
{
 int fd; 

 if ((fd = socket(domain, type, protocol)) == -1)
 {
  perror("creat socket error:");
  exit(1);
 }
 
 return(fd); 
}

int i_bind(int fd, const struct sockaddr *addr, int namelen)
{
 if (-1 == bind(fd, addr, namelen))
 {
  perror("i_bind error:");
  exit(1);
 }
 
 return (0);
}

int i_recvfrom(int fd, void *buf, size_t len, int flags,
  struct sockaddr *addr, int *size)
{ 
 if (-1 == recvfrom(fd, buf, len, flags, addr, size))
 {
  perror("i_recvfrom error:");
  exit(1); 
 }
 
 return(0);
}

int i_sendto(int fd, void *buf, size_t len, int flags,
  struct sockaddr *addr, int size)
{
 if (-1 == sendto(fd, buf, len, flags, addr, size))
 {
  perror("i_sendto error");
  exit(1); 
 }
 
 return (0);
}

int i_open(const char *pathname, int flags)
{
 int fd;
 if ((fd = open(pathname, flags)) == -1)
 {
  perror("open_failed");
  exit(1);
 }
 
 return (fd);
}
int i_read(int fd, void *msg, int len)
{
 if(-1 == read(fd, msg, len))
 {
  perror("i_read error");
  exit(1);
 }
 return(0);
}
int i_write(int fd, void *msg, int len)
{
 if (-1 == write(fd, msg, len))
 {
  perror("i_write error");
  exit(0);
 }
 return(0);
}

/* init a socket,file and server addr */
int i_init()
{
 mainfd = i_open("./chat_log", O_RDWR|O_CREAT);
 sockfd = i_socket(AF_INET, SOCK_DGRAM, 0);

 /* initialize server address */
 bzero(&server, sizeof(server));
 server.sin_family = AF_INET;
 inet_pton(AF_INET, "127.0.0.1", &server.sin_addr);
 server.sin_port = htons(SEVR_PORT);

 perror("init");
 
 return (0);
}

char *i_get_time()
{
 time_t time_now;
 time(&time_now);

 return(ctime(&time_now));
}
int i_lseek(int fd, off_t size, int position)
{
 if (-1 == lseek(fd, size, position))
 {
  perror("seek error");
  exit(1);
 }
 return(0);
}
int i_saveto_chat(struct msg *pmsg)
{ 
 struct chat_history hstr;

 bzero(&hstr, HSTR_LEN);
 count = count + 1;
 hstr.count =count;
 hstr.from = pmsg->id_from;
 hstr.to = pmsg->id_to;
 strncpy(hstr.content, pmsg->content, CNTNT_LEN);
 strncpy(hstr.time, i_get_time(), 25);

 i_lseek(mainfd, 0, SEEK_END);

 i_write(mainfd, &hstr, HSTR_LEN);

 return(0);
}

int i_print_history(int len, int i)
{
 struct chat_history chat_reader;
 int j;
 int position;
 
 bzero(&chat_reader, HSTR_LEN);
 if (i != 0)
 {
  position = len*i*HSTR_LEN;
  i_lseek(mainfd, position, SEEK_END);
 }
 else
 {
  position = len*i*HSTR_LEN;

  i_lseek(mainfd, HSTR_LEN, SEEK_SET);
 }
  
 for (j = 1; j <= len; j++)
 {
  
  i_read(mainfd, &chat_reader, HSTR_LEN);
  printf("\n#item%d:id%dto id%d \n", j,
   chat_reader.from, chat_reader.to);
  i_print(chat_reader.content, CNTNT_LEN);
  printf("\n  Time:%s\n", chat_reader.time);
 }

 return(0);
}

#endif