linux聊天室程序如何实现

代码：

#ifndef _i_h #define _i_h #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include  #include #include #include #include  #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 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

代码二：

#include "i.h" int user_list_fd; /* start:initialization */int init(){  i_init();   user_list_fd = i_open("./user_list", o_rdwr|o_creat);   struct user usr;  /* init the user list file's fist user to 0*/  memset((struct user*)&usr, '\0', sizeof(struct user));  i_lseek(user_list_fd, 0, seek_set);  i_write(user_list_fd, (char*)&usr, usr_len);   /* bind the struct sockaddr_in server to the sockfd */  i_bind(sockfd, (struct sockaddr*)&server, addr_len);     struct chat_history apple;    bzero(&apple, hstr_len);  i_lseek(mainfd, 0, seek_set);  i_write(mainfd, &apple, hstr_len);  i_lseek(mainfd, -hstr_len, seek_end);  i_read(mainfd, &apple, hstr_len);  count = apple.count;   return(0);}/* end:initialization */ /* start:message control */int send_msg(struct msg *msg_recv, struct sockaddr *addr){  int i;  struct user usr;   /* a common message come */  printf("a ordinar message come !\n");     i = msg_recv->id_to;  i_lseek(user_list_fd, i*usr_len, seek_set);  i_read(user_list_fd, &usr, usr_len);  strncpy(msg_recv->append, usr.name, 10);   i_sendto(sockfd, msg_recv, msg_len, 0,    &(usr.user_addr), addr_len);     printf("id%d send a message to id%d sucess!\n", msg_recv->id_from, msg_recv->id_to);   return(0);}int check_login(struct msg *msg_recv, struct sockaddr *addr){  int i = msg_recv->id_from;;  struct user usr;   /* a login requet */  printf("a login request come!\n");     /* get the id's information */  i_lseek(user_list_fd, i*usr_len, seek_set);  i_read(user_list_fd, &usr, usr_len);   int n;  n = strcmp(usr.password, msg_recv->content);  /* 如果验证成功，则发送成功信息 */  if (n == 0)  {    /* save user new address */    i_lseek(user_list_fd, -usr_len, seek_cur);    usr.user_addr = *addr;    i_write(user_list_fd, &usr, usr_len);    /* tell user pass */    i_sendto(sockfd, (struct msg*)msg_recv, sizeof(struct msg), 0,      &(usr.user_addr), addr_len);       }  else  {    /* 出错的话的respond */    if (0 != n)    {      printf("id %d login error.\n", i);      bzero(msg_recv->content, cntnt_len);           msg_recv->flag = -1;      i_sendto(sockfd, (struct msg*)msg_recv, sizeof(struct msg), 0,        &(usr.user_addr), addr_len);         }    return(1);  }  printf("id %d login sucess!\n", i);      return(0);}int reg_user(struct msg *msg_recv, struct sockaddr *addr){  struct user usr;     printf("a regit requet come:\n");   /* find the last user and hava the please to add a new user */  int n;  i_lseek(user_list_fd, -usr_len, seek_end);  i_read(user_list_fd, &usr, usr_len);  /* 把新用户的信息赋值到usr然后填入到user list file中 */  const char *name;  const char *password;   name = &(msg_recv->content[0]);  password = &(msg_recv->content[10]);  strcpy((usr.name), name);  strcpy(usr.password, password);  memcpy(&(usr.user_addr),addr, addr_len);   usr.id = (usr.id + 1);  i_lseek(user_list_fd, 0, seek_end);  i_write(user_list_fd, &usr, usr_len);   msg_recv->id_from = usr.id;  /* regist to the user list then tell the user reg success */  i_sendto(sockfd, (struct msg*)msg_recv, sizeof(struct msg), 0,    addr, addr_len);    printf("id %d regist sucess!\n", usr.id);   return(0);   }int msg_cntl(){  struct msg msg_recv;  struct sockaddr addr_recv;   printf("begin listen input...\n");  int size = addr_len;   for (;;)  {    bzero(&msg_recv, msg_len);    i_recvfrom(sockfd, &msg_recv, sizeof(struct msg), 0,      &addr_recv, &size);    printf("message received...\n");     i_saveto_chat(&msg_recv);     switch (msg_recv.flag)    {      case 1 :        send_msg(&msg_recv,(struct sockaddr*)&addr_recv);/* send ordinary chat */        break;      case 2 :        check_login(&msg_recv, (struct sockaddr*)&addr_recv);        break;           case 3 :        reg_user(&msg_recv, (struct sockaddr*)&addr_recv);        break;      default :        break;    }  }  return(0);}/* end:message control*//* start:exit_sys()*/int exit_sys(){  close(sockfd);  close(mainfd);  close(user_list_fd);  printf("exit system");  kill(0, sigabrt);   exit(0);}/* end:exit_sys()*/ /* start:chat_history*/int get_page_size(){  struct chat_history page_size_reader;     i_lseek(mainfd, -hstr_len, seek_end);  i_read(mainfd, &page_size_reader, hstr_len);   return(page_size_reader.count);} int read_chat_history(){  printf("****char*history***");  printf("(n-nextpage; p-prepage; q-quit)\n");   int page_num;/* */  int remains;  int berry = get_page_size();    page_num = berry / 8;  remains = berry % 8;   if (remains != 0)    page_num ++;  else    page_num = page_num;       printf("there are %d page total %d items",     page_num, berry);   int i = -1;   while (1)  {      char flag;      if ((berry + i*8) >= 0)    {      printf("(%d~%d)\n", (berry + i*8), (berry + (i+1)*8));       i_print_history(prt_len, i);       printf("@@@\n");      while ('\n' == (flag = getchar()))      {      }       switch (flag)      {        case 'p' :          i--;          break;        case 'n' :          i++;          break;        case 'q' :          return(0);        default :          break;      }        if (i >= 0)      {        printf("have at the end!\n");        printf("return to menu!\n");      }        }    else    {      printf("(1~%d)\n", remains);                 i_print_history(remains, 0);             printf("#########over##############\n");       return(0);    }    }       return(0);}/* end:chat_history*//* start:menu*/int menu(){  sleep(1);   printf("----------help----menu---------\n");  printf("\t r--report to user\n");  printf("\t c--chat history\n");  printf("\t h--help menu\n");  printf("\t e--exit the system\n");  printf("----------help_menu---------\n");   int command = 0;   printf("input command>");  command = getchar();  switch(command)  {     case 'c':      read_chat_history();      break;    case 'e':      exit_sys();      break;    case 'r':      //report();      //break;    default :      menu();      break;  }  getchar();     return(0);}/* end:menu*/int main(){  init();  pid_t pid;  switch (pid = fork())  {    case -1 :      perror("fork error\n");      exit(1);      break;    case 0 :      msg_cntl();      break;    default :      menu();      break;  }   return(0);}

代码三：

#include "i.h" #define start_port 8089 struct sockaddr_in my_addr;int my_id; int my_log();/* declare funtion*/ /* */int i_send_msg(){      int id;  struct msg the_msg;  char end = '@';   printf("input recver id:");  scanf("%d", &id);  getchar();  printf("\ninput content:");  i_input(the_msg.content);     char flag = 'y';       if (1)  {    the_msg.flag = 1;    the_msg.id_from = my_id;    the_msg.id_to = id;         i_sendto(sockfd, &the_msg, sizeof(struct msg), 0,      (struct sockaddr*)&server, sizeof(struct sockaddr));         i_saveto_chat(&the_msg); /* save to history */     printf("send to id:%d success.\n", my_id);    return(0);  }  else    return(1);   return(0);} int reply(){  return(0);}int send_file(){  return(0);}/**//* start:initialize */int init(){    struct ifreq req;  struct sockaddr_in *host;  int port;   i_init();  /* init user addr */  bzero(&my_addr, sizeof(struct sockaddr));  my_addr.sin_family = af_inet;  strcpy(req.ifr_name, "lo");  if ( ioctl(sockfd, siocgifaddr, &req) sin_addr));   memcpy(&my_addr, (struct sockaddr_in*)&(req.ifr_addr),     sizeof(struct sockaddr_in));   port = start_port;   do  {    port++;    my_addr.sin_port = htons(port);    bind(sockfd, (struct sockaddr*)&my_addr,       sizeof(struct sockaddr));     }   while (errno == eaddrinuse);   struct chat_history apple;      memset(&apple, 'b', hstr_len);  i_lseek(mainfd, 0, seek_set);  apple.count = 0;  i_write(mainfd, &apple, hstr_len);  i_lseek(mainfd, -hstr_len, seek_end);  i_read(mainfd, &apple, hstr_len);  count = apple.count;     printf("port:%d\n", port);   printf("init successful!!!\n");    return(0); }/* end:initialize *//* start:chat_history*/int get_page_size(){  struct chat_history page_size_reader;     i_lseek(mainfd, -hstr_len, seek_end);  i_read(mainfd, &page_size_reader, hstr_len);   return(page_size_reader.count);} int read_chat_history(){  printf("****char*history***");  printf("(n-nextpage; p-prepage; q-quit)\n");   int page_num;/* */  int remains;  int berry = get_page_size();    page_num = berry / 8;  remains = berry % 8;   if (remains != 0)    page_num ++;  else    page_num = page_num;       printf("there are %d page total %d items",     page_num, berry);   int i = -1;   while (1)  {      char flag;      if ((berry + i*8) >= 0)    {      printf("(%d~%d)\n", (berry + i*8), (berry + (i+1)*8));       i_print_history(prt_len, i);       printf("@@@\n");      while ('\n' == (flag = getchar()))      {      }       switch (flag)      {        case 'p' :          i--;          break;        case 'n' :          i++;          break;        case 'q' :          return(0);        default :          break;      }        if (i >= 0)      {        printf("have at the end!\n");        printf("return to menu!\n");      }        }    else    {      printf("(1~%d)\n", remains);                 i_print_history(remains, 0);             printf("#########over##############\n");       return(0);    }    }       return(0);}/* end:chat_history*//* start:exit_sys*/void exit_sys(){  close(sockfd);  close(mainfd);  kill(0, sigabrt);   exit(0);}/* end:exit_sys*/ /* start:menu*/int print_menu(){  printf("\n--------------help--menu----------------\n");  printf("\t h--help munu\n");  printf("\t s--send message\n");  printf("\t r--reply to\n");  printf("\t c--chat history\n");  printf("\t f--send files\n");  printf("\t e--exit the system\n");  printf("----------------help--menu----------------\n");}int get_input(char *command){    printf(">");  scanf("%c", command);   return(1);}int menu(){  /* to avoid the output at mixed with the sub process */  sleep(1);   print_menu();     char command;   while (1 == get_input(&command))  {      switch(command)    {      case 'h':        print_menu();        break;         case 's':        i_send_msg();        break;      case 'r':        reply();        break;      case 'f':        send_file();        break;      case 'c':        read_chat_history();        break;      case 'e':        exit_sys();        break;      default :        printf(">");        break;    }  }  return(0);}/* end:menu*//* start:message contol :send_msg and recv_msg */int ordnary_msg_recv(struct msg *pmsg){  char time_info[25];  char end_symble;  end_symble = '&';   /* handle the msg */  printf("message:from %s(id%d) to u:\n", pmsg->append, pmsg->id_from);  i_print(pmsg->content, msg_len);  printf("\n\t%s", i_get_time());   return(0);}int file_msg_recv(struct msg *pmsg){}int handle_msg(struct msg *pmsg){    if (pmsg->flag == 1)  {    ordnary_msg_recv(pmsg);    return(0);  }  else if (pmsg->flag >= 4)  {    file_msg_recv(pmsg);    return(0);  }    return(0);}int listen_msg(){  struct msg msg_recv;  struct sockaddr addr_recv;  int len = addr_len;   printf("begin listen...\n");   for ( ; ; )  {      i_recvfrom(sockfd, &msg_recv, msg_len, 0,        &addr_recv, &len);     i_saveto_chat(&msg_recv); /* save to history */          ordnary_msg_recv(&msg_recv);  }} /* end:message contol*/ /* start:log process :login and regist */int login(){  /* input id:*/  printf("*****login>>\n");  printf("id:");  scanf("%d", &my_id);  /* input password*/  char password[15];  printf("\npassword(*less 15 char):");  scanf("%s", password);  getchar();     /* send login information */  struct msg log_msg;   bzero(&log_msg, msg_len);  log_msg.flag = 2;  log_msg.id_from = my_id;  log_msg.id_to = 0;  strncpy(log_msg.content, password, 15);   i_saveto_chat(&log_msg); /* save to history */     i_sendto(sockfd, (struct msg*)&log_msg, msg_len, 0,     (struct sockaddr*)&server, sizeof(struct sockaddr));//printf("log_msg : %d\n", log_msg.id_from);//printf("password: %s\n", log_msg.content);  /* after input msg ,wait for server respond*/  struct sockaddr in_addr;  int len = addr_len;  i_recvfrom(sockfd, (struct msg*)&log_msg, msg_len,0,    &in_addr, &len);  if (2 == log_msg.flag)  {    printf("login success\n");    return(0);  }    else  {    printf("login error:%s\n", log_msg.content);    printf("please relog..\n");    menu();  }     return (0);}int regist(){  printf("*****regist>>\n");  /* input chat name */  char name[10];   bzero(name, 10);  printf("input your chat name(less 8 char):");  scanf("%s", name);   //name[9] = ';';     /* add a ; symbol in the end of name */  /* input password */  char password[15];   bzero(password, 15);  printf("\ninput your password(less 14 char):");  scanf("%s", password);   /* send regist information*/  struct msg reg_msg;   bzero(&reg_msg, msg_len);  reg_msg.flag = 3;  reg_msg.id_from = 0;  reg_msg.id_to = 0;  bzero(reg_msg.content, cntnt_len);  strncpy(reg_msg.content, name, 10);  strncpy(&(reg_msg.content[10]), password, 15);  reg_msg.content[25] = '\n';   i_saveto_chat(&reg_msg); /* save to history */   /* send regist informatin to server */  i_sendto(sockfd, (struct msg*)&reg_msg, sizeof(struct msg), 0,     (struct sockaddr*)&server, addr_len);  /* after input msg ,wait for server respond*/  printf("wating for server reply...\n");   struct sockaddr in_addr;  struct msg msg_back;  int len = addr_len;     bzero(&in_addr, addr_len);  bzero(&msg_back, msg_len);  i_recvfrom(sockfd,(struct msg*)&msg_back, msg_len,0,    &in_addr, &len);   /* check whether pass */  if (3 != msg_back.flag)  {    printf("error: %s \n", msg_back.content);    exit(1);  }  else    my_id = msg_back.id_to;    printf("congratulate! you have regist"      "id %s(id %d) success\n", msg_back.content, msg_back.id_to);     login();   return(0); } int my_log(){  /* choose login or regist*/  char flag;  printf("are you want login or regist(l/r)\n");  scanf("%c", &flag);  getchar();  switch (flag){    case 'l' :      login();      break;    case 'r' :      regist();      break;    default :      printf("error input\n");      my_log();      break;  }  return (0);}/* end:log */ int main(){  init();  printf("\n************welcome!************\n");  my_log();   pid_t pid;   switch (pid = fork())  {    case -1 :      perror("fork error!\n");      exit(1);      break;    case 0 :      listen_msg();      break;    default :      menu();      break;  }}

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