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这篇文章主要介绍“linux聊天室程序如何实现”的相关知识，小编通过实际案例向大家展示操作过程，操作方法简单快捷，实用性强，希望这篇“linux聊天室程序如何实现”文章能帮助大家解决问题。
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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 < 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
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) < 0 ) /* get local ip address */
{
perror("get local ip error");
exit(1);
}
host = (struct sockaddr_in*)&(req.ifr_addr);
printf("ip: %s\n", inet_ntoa(host->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(®_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(®_msg); /* save to history */
/* send regist informatin to server */
i_sendto(sockfd, (struct msg*)®_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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