注意：
创建sqlite3数据库:
输入命令：
1、 sqlite3 my.db
2、 sqlite3
3、 create table usr(name char,data char);
4、 create table record(name char, date char,word char);
5、下载词典：dict.txt放在当前目录下（链接：/s/1miL2h2w）；
6.编写Makefile：（gcc是按键Tab的间距）
all:
gcc server.c -lsqlite3 -o server
gcc client.c -o client
sever.c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sqlite3.h>
#include <signal.h>
#include <time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define DATABASE "my.db"
typedef struct
{
int type;
char name[20];
char data[256];
}MSG;
void do_register(int connectfd, MSG *msg, sqlite3 *db)
{
char sqlstr[128];
char *errmsg;
sprintf(sqlstr, "insert into usr values ('%s', '%s')", msg->name, msg->data);
printf("%s\n", sqlstr);
if (sqlite3_exec(db, sqlstr, NULL, NULL, &errmsg) != SQLITE_OK)
{
sqlite3_free(errmsg);
sprintf(msg->data, "user %s already exist!!!", msg->name);
}
else
{
strncpy(msg->data, "OK", 256);
}
send(connectfd, msg, sizeof(MSG), 0);
return;
}
void do_login(int connectfd, MSG *msg, sqlite3 *db)
{
char sqlstr[128];
char *errmsg, **result;
int nrow, ncolumn;
sprintf(sqlstr, "select * from usr where name = '%s' and data = '%s'", msg->name, msg->data);
if (sqlite3_get_table(db, sqlstr, &result, &nrow, &ncolumn, &errmsg) != SQLITE_OK)
{
printf("error : %s\n", errmsg);
sqlite3_free(errmsg);
}
if (nrow == 0)
{
strncpy(msg->data, "name or password is wrong!!!", 256);
}
else
{
strncpy(msg->data, "OK", 256);
}
send(connectfd, msg, sizeof(MSG), 0);
sqlite3_free_table(result);
return;
}
void get_date(char date[])
{
time_t t;
struct tm *tp;
time(&t);
tp = localtime(&t);
strftime(date, 64, "%Y-%m-%d %H:%M:%S", tp);
return;
}
int do_searchword(int connectfd, MSG *msg)
{
FILE *fp;
char s[300];
char *p;
if ((fp = fopen("dict.txt", "r")) == NULL)
{
strcpy(msg->data, "dict on server can't be opened :(");
send(connectfd, msg, sizeof(MSG), 0);
}
printf("query word is %s\n", msg->data);
while (fgets(s, 300, fp) != NULL)
{
if (0 == strncmp(msg->data,s,strlen(msg->data)) )
{
p = s + strlen(msg->data);
while(0 == strncmp(p," ",1) ) p++;
strcpy(msg->data,p);
send(connectfd,msg,sizeof(MSG),0);
fclose(fp);
return 1;
}
}
fclose(fp);
return 0;
}
void do_query(int connectfd, MSG *msg, sqlite3 *db)
{
char sqlstr[128], *errmsg;
int found = 0;
char date[64], word[64];
strcpy(word, msg->data);
found = do_searchword(connectfd, msg);
if ( found )
{
get_date(date);
sprintf(sqlstr, "insert into record values ('%s', '%s', '%s')", msg->name, date, word);
if (sqlite3_exec(db, sqlstr, NULL, NULL, &errmsg) != SQLITE_OK)
{
printf("error : %s\n", errmsg);
sqlite3_free(errmsg);
}
}
else
{
strcpy(msg->data, "not found\n");
}
send(connectfd, msg, sizeof(MSG), 0);
return;
}
int history_callback(void *arg, int f_num, char **f_value, char **f_name)
{
int connectfd;
MSG msg;
connectfd = *(int *)arg;
sprintf(msg.data, "%s : %s", f_value[1], f_value[2]);
send(connectfd, &msg, sizeof(msg), 0);
return 0;
}
void do_history(int connectfd, MSG *msg, sqlite3 *db)
{
char sqlstr[128], *errmsg;
sprintf(sqlstr, "select * from record where name = '%s'", msg->name);
if (sqlite3_exec(db, sqlstr, history_callback, (void *)&connectfd, &errmsg) != SQLITE_OK)
{
printf("error : %s\n", errmsg);
sqlite3_free(errmsg);
}
msg->data[0] = '\0';
send(connectfd, msg, sizeof(MSG), 0);
return;
}
void do_client(int connectfd, sqlite3 *db)
{
MSG msg;
while (recv(connectfd, &msg, sizeof(msg), 0) > 0)
{
switch ( msg.type )
{
case 1 :
do_register(connectfd, &msg, db);
break;
case 2 :
do_login(connectfd, &msg, db);
break;
case 3 :
do_query(connectfd, &msg, db);
break;
case 4 :
do_history(connectfd, &msg, db);
break;
}
}
printf("client quit!!!\n");
exit(0);
return;
}
int main(int argc, char *argv[])
{
int listenfd, connectfd;
struct sockaddr_in server_addr;
pid_t pid;
sqlite3 *db;
if (sqlite3_open(DATABASE, &db) != SQLITE_OK)
{
printf("error : %s\n", sqlite3_errmsg(db));
exit(-1);
}
if ((listenfd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
{
perror("fail to socket");
exit(-1);
}
printf("listenfd=%d\n",listenfd);
bzero(&server_addr, sizeof(server_addr));
server_addr.sin_family = PF_INET;
server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
server_addr.sin_port = htons(8888);
printf("[Port]=%d\n[IP]=%s\n",htons(server_addr.sin_port),inet_ntoa(server_addr.sin_addr));
if (bind(listenfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0)
{
perror("fail to bind");
exit(-1);
}
printf("server bind succeed\n");
if (listen(listenfd, 5) < 0)
{
perror("fail to listen");
exit(-1);
}
printf("server listen succeed\n");
signal(SIGCHLD, SIG_IGN); // 为了不生成僵尸进程
while (1)
{
if ((connectfd = accept(listenfd, NULL, NULL)) < 0)
{
perror("fail to accept");
exit(-1);
}
if ((pid = fork()) < 0) //多进程
{
perror("fail to fork");
exit(-1);
}
if (pid == 0)//子进程
{
do_client(connectfd, db);
}
close(connectfd);
}
return 0;
}
client.c
#include<stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sqlite3.h>
#include <signal.h>
#include <time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define DATABASE "my.db"
typedef struct
{
int type;
char name[20];
char data[256];
}MSG;
void do_register(int socketfd, MSG *msg)
{
msg->type = 1;
printf("input name : ");
scanf("%s", msg->name);
printf("input password : ");
scanf("%s", msg->data);
send(socketfd, msg, sizeof(MSG), 0);
recv(socketfd, msg, sizeof(MSG), 0);
printf("register : %s\n", msg->data);
return;
}
int do_login(int socketfd, MSG *msg)
{
msg->type = 2;
printf("input name : ");
scanf("%s", msg->name);
printf("input password : ");
scanf("%s", msg->data);
send(socketfd, msg, sizeof(MSG), 0);
recv(socketfd, msg, sizeof(MSG), 0);
if (strncmp(msg->data, "OK", 3) == 0)
{
printf("login : OK\n");
return 1;
}
printf("login : %s\n", msg->data);
return 0;
}
void do_query(int socketfd, MSG *msg)
{
msg->type = 3;
while (1)
{
printf("Input:");
scanf("%s", msg->data);
if (strcmp(msg->data, "#") == 0) break; //输入“#”退出
send(socketfd, msg, sizeof(MSG), 0);
recv(socketfd, msg, sizeof(MSG), 0);
printf("%s\n",msg->data);
}
return;
}
void do_history(int socketfd, MSG *msg)
{
msg->type = 4;
send(socketfd, msg, sizeof(MSG), 0);
while (1)
{
recv(socketfd, msg, sizeof(MSG), 0);
if (msg->data[0] == '\0') break;
printf("%s\n", msg->data);
}
return;
}
int main(int argc, char *argv[])
{
int socketfd ;
struct sockaddr_in server_addr;
MSG msg;
if ((socketfd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
{
perror("fail to socket");
}
bzero(&server_addr, sizeof(server_addr));
server_addr.sin_family = PF_INET;
server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
server_addr.sin_port = htons(8888);
if (connect(socketfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0)
{
perror("fail to connect");
exit(-1);
}
int n;
while (1)
{
printf("************************************\n");
printf("*********** 1:register *************\n");
printf("*********** 2: login *************\n");
printf("*********** 3: quit *************\n");
printf("************************************\n");
printf("please choose : ");
if (scanf("%d", &n) <= 0)
{
perror("scanf");
exit(-1);
}
switch (n)
{
case 1 :
do_register(socketfd, &msg);
break;
case 2 :
if (do_login(socketfd, &msg) == 1)
{
printf("\n");
goto next;
}
break;
case 3 :
close(socketfd);
exit(0);
}
}
next:
while (1)
{
printf("***********************************************\n");
printf("* 1: query_word 2: history_record 3: quit *\n");
printf("***********************************************\n");
printf("please choose : ");
if (scanf("%d", &n) < 0)
{
perror("scanf");
exit(-1);
}
switch (n)
{
case 1 :
do_query(socketfd, &msg);
break;
case 2 :
do_history(socketfd, &msg);
break;
case 3 :
close(socketfd);
exit(0);
}
}
return 0;
}
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