- \n
- \u529f\u80fd：\u5ba2\u6237\u7aef\u7a0b\u5e8f，\u5141\u8bb8\u7528\u6237\u9009\u62e9\u6ce8\u518c\u6216\u767b\u5f55\u64cd\u4f5c，\u8f93\u5165\u7528\u6237\u540d\u548c\u5bc6\u7801，\u5c06\u8bf7\u6c42\u53d1\u9001\u7ed9\u670d\u52a1\u5668，\u5e76\u63a5\u6536\u670d\u52a1\u5668\u7684\u54cd\u5e94\u7ed3\u679c\u3002<\/li>\n
- \u8f93\u5165：\u7528\u6237\u9009\u62e9（1 \u8868\u793a\u6ce8\u518c，2 \u8868\u793a\u767b\u5f55）\u3001\u7528\u6237\u540d\u3001\u5bc6\u7801\u3002<\/li>\n
- \u8f93\u51fa：\u670d\u52a1\u5668\u8fd4\u56de\u7684\u5904\u7406\u7ed3\u679c（\u5982\u6ce8\u518c\u6210\u529f\u3001\u7528\u6237\u540d\u5df2\u5b58\u5728\u3001\u767b\u5f55\u6210\u529f\u7b49）\u3002<\/li>\n<\/ul>\n
1.1. \u8be6\u7ec6\u6b65\u9aa4<\/h3>\n
1.1.1. \u5305\u542b\u5fc5\u8981\u7684\u5934\u6587\u4ef6<\/h4>\n
#include <stdio.h>
\n#include <stdlib.h>
\n#include <string.h>
\n#include <sys\/socket.h>
\n#include <arpa\/inet.h><\/p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u8fd9\u4e9b\u5934\u6587\u4ef6\u63d0\u4f9b\u4e86\u6807\u51c6\u8f93\u5165\u8f93\u51fa\u3001\u5185\u5b58\u7ba1\u7406\u3001\u5b57\u7b26\u4e32\u5904\u7406\u3001\u5957\u63a5\u5b57\u7f16\u7a0b\u548c IP \u5730\u5740\u8f6c\u6362\u7b49\u529f\u80fd\u3002<\/p>\n
1.1.2. \u5b9a\u4e49\u534f\u8bae\u5305\u7ed3\u6784\u4f53<\/h4>\n
#define BUF_SIZE 1024<\/p>\n
typedef struct {
\n uint8_t op; \/\/ \u64cd\u4f5c\u7801，1\u8868\u793a\u6ce8\u518c，2\u8868\u793a\u767b\u5f55
\n uint16_t data_len; \/\/ \u6570\u636e\u957f\u5ea6（\u7f51\u7edc\u5b57\u8282\u5e8f）
\n char data[BUF_SIZE];\/\/ \u5b58\u50a8\u7528\u6237\u540d\u3001\u5bc6\u7801\u7b49\u6570\u636e
\n} ProtocolPack;<\/p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u8be5\u7ed3\u6784\u4f53\u7528\u4e8e\u5c01\u88c5\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u4e4b\u95f4\u4f20\u8f93\u7684\u534f\u8bae\u5305，\u5305\u542b\u64cd\u4f5c\u7801\u3001\u6570\u636e\u957f\u5ea6\u548c\u6570\u636e\u5185\u5bb9\u3002<\/p>\n
1.1.3. \u521b\u5efa\u5957\u63a5\u5b57\u5e76\u8fde\u63a5\u670d\u52a1\u5668<\/h4>\n
int sock = socket(AF_INET, SOCK_STREAM, 0);
\nstruct sockaddr_in addr = {
\n .sin_family = AF_INET,
\n .sin_port = htons(8888)
\n};
\ninet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);
\nconnect(sock, (struct sockaddr*)&addr, sizeof(addr));<\/p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4f7f\u7528\u00a0socket\u00a0\u51fd\u6570\u521b\u5efa\u4e00\u4e2a TCP \u5957\u63a5\u5b57，\u8bbe\u7f6e\u670d\u52a1\u5668\u5730\u5740\u548c\u7aef\u53e3，\u7136\u540e\u4f7f\u7528\u00a0connect\u00a0\u51fd\u6570\u8fde\u63a5\u5230\u670d\u52a1\u5668\u3002<\/p>\n
1.1.4. \u83b7\u53d6\u7528\u6237\u8f93\u5165<\/h4>\n
int choice;
\nprintf("1. \u6ce8\u518c\\\\n2. \u767b\u5f55\\\\n\u9009\u62e9: ");
\nscanf("%d", &choice);<\/p>\nchar username[32], password[32];
\nprintf("\u7528\u6237\u540d: ");
\nscanf("%31s", username);
\nprintf("\u5bc6\u7801: ");
\nscanf("%31s", password);<\/p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u63d0\u793a\u7528\u6237\u9009\u62e9\u64cd\u4f5c\u7c7b\u578b（\u6ce8\u518c\u6216\u767b\u5f55），\u5e76\u8f93\u5165\u7528\u6237\u540d\u548c\u5bc6\u7801\u3002<\/p>\n
1.1.5. \u6784\u5efa\u534f\u8bae\u5305\u5e76\u53d1\u9001<\/h4>\n
ProtocolPack pack = {0};
\npack.op = (uint8_t)choice;
\nsprintf(pack.data, "%s %s", username, password);
\npack.data_len = htons(strlen(pack.data));
\nsend(sock, &pack, sizeof(ProtocolPack), 0);<\/p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5c06\u7528\u6237\u9009\u62e9\u7684\u64cd\u4f5c\u7801\u3001\u7528\u6237\u540d\u548c\u5bc6\u7801\u5c01\u88c5\u5230\u534f\u8bae\u5305\u4e2d，\u5e76\u4f7f\u7528\u00a0send\u00a0\u51fd\u6570\u53d1\u9001\u7ed9\u670d\u52a1\u5668\u3002<\/p>\n
1.1.6. \u63a5\u6536\u670d\u52a1\u5668\u54cd\u5e94\u5e76\u8f93\u51fa\u7ed3\u679c<\/h4>\n
ProtocolPack resp_pack;
\nrecv(sock, &resp_pack, sizeof(ProtocolPack), 0);
\nprintf("\u7ed3\u679c: %s\\\\n", resp_pack.data);<\/p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4f7f\u7528\u00a0recv\u00a0\u51fd\u6570\u63a5\u6536\u670d\u52a1\u5668\u7684\u54cd\u5e94\u534f\u8bae\u5305，\u5e76\u8f93\u51fa\u7ed3\u679c\u3002<\/p>\n
1.1.7. \u5173\u95ed\u5957\u63a5\u5b57<\/h4>\n
close(sock);<\/p>\n
3.\u670d\u52a1\u5668\u529f\u80fd\u5b9e\u73b0\u5206\u6790<\/font><\/h2>\n
- \n
- \u529f\u80fd：\u670d\u52a1\u5668\u7a0b\u5e8f，\u76d1\u542c\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42，\u63a5\u6536\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u6ce8\u518c\u6216\u767b\u5f55\u8bf7\u6c42，\u5904\u7406\u8bf7\u6c42\u5e76\u5c06\u7ed3\u679c\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u3002\u4f7f\u7528 SQLite \u6570\u636e\u5e93\u5b58\u50a8\u7528\u6237\u4fe1\u606f\u3002<\/li>\n
- \u8f93\u5165：\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u534f\u8bae\u5305，\u5305\u542b\u64cd\u4f5c\u7801\u3001\u7528\u6237\u540d\u548c\u5bc6\u7801\u3002<\/li>\n
- \u8f93\u51fa：\u5904\u7406\u7ed3\u679c（\u5982\u6ce8\u518c\u6210\u529f\u3001\u7528\u6237\u540d\u5df2\u5b58\u5728\u3001\u767b\u5f55\u6210\u529f\u7b49），\u5c01\u88c5\u5728\u534f\u8bae\u5305\u4e2d\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u3002<\/li>\n<\/ul>\n
3.1. \u8be6\u7ec6\u6b65\u9aa4<\/h3>\n
3.1.1. \u5305\u542b\u5fc5\u8981\u7684\u5934\u6587\u4ef6<\/h4>\n
#include <stdio.h>
\n#include <stdlib.h>
\n#include <string.h>
\n#include <sys\/socket.h>
\n#include <arpa\/inet.h>
\n#include <sys\/epoll.h>
\n#include <sqlite3.h><\/p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u8fd9\u4e9b\u5934\u6587\u4ef6\u63d0\u4f9b\u4e86\u6807\u51c6\u8f93\u5165\u8f93\u51fa\u3001\u5185\u5b58\u7ba1\u7406\u3001\u5b57\u7b26\u4e32\u5904\u7406\u3001\u5957\u63a5\u5b57\u7f16\u7a0b\u3001\u4e8b\u4ef6\u9a71\u52a8 I\/O \u548c SQLite \u6570\u636e\u5e93\u64cd\u4f5c\u7b49\u529f\u80fd\u3002<\/p>\n
3.1.2. \u5b9a\u4e49\u5e38\u91cf\u548c\u534f\u8bae\u5305\u7ed3\u6784\u4f53<\/h4>\n
#define MAX_EVENTS 100
\n#define BUF_SIZE 1024<\/p>\ntypedef struct {
\n uint8_t op; \/\/ \u64cd\u4f5c\u7801，1\u8868\u793a\u6ce8\u518c，2\u8868\u793a\u767b\u5f55
\n uint16_t data_len; \/\/ \u6570\u636e\u957f\u5ea6（\u7f51\u7edc\u5b57\u8282\u5e8f）
\n char data[BUF_SIZE];\/\/ \u5b58\u50a8\u7528\u6237\u540d\u3001\u5bc6\u7801\u7b49\u6570\u636e
\n} ProtocolPack;<\/p>\n\u00a0 \u00a0 MAX_EVENTS\u00a0\u5b9a\u4e49\u4e86\u00a0epoll_wait\u00a0\u51fd\u6570\u8fd4\u56de\u7684\u6700\u5927\u4e8b\u4ef6\u6570\u91cf，BUF_SIZE\u00a0\u5b9a\u4e49\u4e86\u534f\u8bae\u5305\u6570\u636e\u90e8\u5206\u7684\u6700\u5927\u7f13\u51b2\u533a\u5927\u5c0f\u3002<\/p>\n
3.1.3. \u521d\u59cb\u5316\u6570\u636e\u5e93<\/h4>\n
sqlite3* init_db() {
\n sqlite3* db;
\n int rc = sqlite3_open("user.db", &db);
\n if (rc) {
\n fprintf(stderr, "Can't open database: %s\\\\n", sqlite3_errmsg(db));
\n exit(1);
\n }
\n const char* sql = "CREATE TABLE IF NOT EXISTS users ("
\n "id INTEGER PRIMARY KEY AUTOINCREMENT,"
\n "username TEXT UNIQUE NOT NULL,"
\n "password TEXT NOT NULL)";
\n char* errmsg;
\n rc = sqlite3_exec(db, sql, 0, 0, &errmsg);
\n if (rc != SQLITE_OK) {
\n fprintf(stderr, "SQL error: %s\\\\n", errmsg);
\n sqlite3_free(errmsg);
\n }
\n return db;
\n}<\/p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6253\u5f00\u6216\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a\u00a0user.db\u00a0\u7684 SQLite \u6570\u636e\u5e93，\u5e76\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a\u00a0users\u00a0\u7684\u8868，\u7528\u4e8e\u5b58\u50a8\u7528\u6237\u4fe1\u606f\u3002<\/p>\n
3.1.4. \u5904\u7406\u7528\u6237\u6ce8\u518c\u903b\u8f91<\/h4>\n
int handle_register(sqlite3* db, const char* username, const char* password) {
\n const char* sql = "INSERT INTO users (username, password) VALUES (?, ?)";
\n sqlite3_stmt* stmt;
\n int rc = sqlite3_prepare_v2(db, sql, -1, &stmt, 0);
\n if (rc != SQLITE_OK) return -1;<\/p>\nsqlite3_bind_text(stmt, 1, username, -1, SQLITE_STATIC);
\n sqlite3_bind_text(stmt, 2, password, -1, SQLITE_STATIC);<\/p>\nrc = sqlite3_step(stmt);
\n if (rc == SQLITE_DONE) {
\n sqlite3_finalize(stmt);
\n return 0; \/\/ \u6ce8\u518c\u6210\u529f
\n }
\n if (rc == SQLITE_CONSTRAINT_UNIQUE) {
\n sqlite3_finalize(stmt);
\n return 1; \/\/ \u7528\u6237\u540d\u5df2\u5b58\u5728
\n }
\n sqlite3_finalize(stmt);
\n return -1;
\n}<\/p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5c06\u7528\u6237\u7684\u7528\u6237\u540d\u548c\u5bc6\u7801\u63d2\u5165\u5230\u00a0users\u00a0\u8868\u4e2d，\u5904\u7406\u53ef\u80fd\u7684\u9519\u8bef\u60c5\u51b5，\u5982 SQL \u6267\u884c\u5931\u8d25\u6216\u7528\u6237\u540d\u5df2\u5b58\u5728\u3002<\/p>\n
3.1.5. \u5904\u7406\u7528\u6237\u767b\u5f55\u903b\u8f91<\/h4>\n
int handle_login(sqlite3* db, const char* username, const char* password) {
\n const char* sql = "SELECT COUNT(*) FROM users WHERE username=? AND password=?";
\n sqlite3_stmt* stmt;
\n int rc = sqlite3_prepare_v2(db, sql, -1, &stmt, 0);
\n if (rc != SQLITE_OK) return -1;<\/p>\nsqlite3_bind_text(stmt, 1, username, -1, SQLITE_STATIC);
\n sqlite3_bind_text(stmt, 2, password, -1, SQLITE_STATIC);<\/p>\nrc = sqlite3_step(stmt);
\n if (rc == SQLITE_ROW) {
\n int count = sqlite3_column_int(stmt, 0);
\n sqlite3_finalize(stmt);
\n return count == 1 ? 0 : -1; \/\/ \u767b\u5f55\u6210\u529f\u8fd4\u56de0，\u5426\u5219\u5931\u8d25
\n }
\n sqlite3_finalize(stmt);
\n return -1;
\n}<\/p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u68c0\u67e5\u7528\u6237\u7684\u7528\u6237\u540d\u548c\u5bc6\u7801\u662f\u5426\u5339\u914d\u6570\u636e\u5e93\u4e2d\u7684\u8bb0\u5f55，\u8fd4\u56de\u767b\u5f55\u7ed3\u679c\u3002<\/p>\n
3.1.6. \u521b\u5efa\u76d1\u542c\u5957\u63a5\u5b57\u5e76\u7ed1\u5b9a\u5730\u5740<\/h4>\n
int listen_fd = socket(AF_INET, SOCK_STREAM, 0);
\nstruct sockaddr_in addr = {
\n .sin_family = AF_INET,
\n .sin_port = htons(8888),
\n .sin_addr.s_addr = INADDR_ANY
\n};
\nbind(listen_fd, (struct sockaddr*)&addr, sizeof(addr));
\nlisten(listen_fd, 5);<\/p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4f7f\u7528\u00a0socket\u00a0\u51fd\u6570\u521b\u5efa\u4e00\u4e2a TCP \u76d1\u542c\u5957\u63a5\u5b57，\u7ed1\u5b9a\u5230\u6307\u5b9a\u7684\u5730\u5740\u548c\u7aef\u53e3，\u7136\u540e\u5f00\u59cb\u76d1\u542c\u5ba2\u6237\u7aef\u8fde\u63a5\u3002<\/p>\n
3.1.7. \u521b\u5efa epoll \u5b9e\u4f8b\u5e76\u76d1\u542c\u4e8b\u4ef6<\/h4>\n
int epoll_fd = epoll_create1(0);
\nstruct epoll_event ev, events[MAX_EVENTS];
\nev.events = EPOLLIN;
\nev.data.fd = listen_fd;
\nepoll_ctl(epoll_fd, EPOLL_CTL_ADD, listen_fd, &ev);<\/p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4f7f\u7528\u00a0epoll_create1\u00a0\u51fd\u6570\u521b\u5efa\u4e00\u4e2a epoll \u5b9e\u4f8b，\u5c06\u76d1\u542c\u5957\u63a5\u5b57\u52a0\u5165\u5230 epoll \u76d1\u63a7\u5217\u8868\u4e2d，\u76d1\u542c\u8bfb\u4e8b\u4ef6\u3002<\/p>\n
3.1.8. \u4e8b\u4ef6\u5faa\u73af\u5904\u7406<\/h4>\n
while (1) {
\n int nfds = epoll_wait(epoll_fd, events, MAX_EVENTS, -1);
\n for (int i = 0; i < nfds; i++) {
\n if (events[i].data.fd == listen_fd) { \/\/ \u65b0\u5ba2\u6237\u7aef\u8fde\u63a5
\n int client_fd = accept(listen_fd, NULL, NULL);
\n ev.events = EPOLLIN;
\n ev.data.fd = client_fd;
\n epoll_ctl(epoll_fd, EPOLL_CTL_ADD, client_fd, &ev);
\n } else { \/\/ \u5904\u7406\u5ba2\u6237\u7aef\u6570\u636e
\n int client_fd = events[i].data.fd;
\n ProtocolPack pack;
\n if (recv(client_fd, &pack, sizeof(ProtocolPack), 0) <= 0) {
\n epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client_fd, NULL);
\n close(client_fd);
\n continue;
\n }<\/p>\nchar username[32] = {0}, password[32] = {0};
\n sscanf(pack.data, "%31s %31s", username, password);<\/p>\nProtocolPack resp_pack = {0};
\n if (pack.op == 1) { \/\/ \u5904\u7406\u6ce8\u518c\u8bf7\u6c42
\n int result = handle_register(db, username, password);
\n if (result == 0) strcpy(resp_pack.data, "REGISTER_SUCCESS");
\n else if (result == 1) strcpy(resp_pack.data, "USER_EXISTS");
\n else strcpy(resp_pack.data, "REGISTER_FAIL");
\n } else if (pack.op == 2) { \/\/ \u5904\u7406\u767b\u5f55\u8bf7\u6c42
\n int result = handle_login(db, username, password);
\n if (result == 0) strcpy(resp_pack.data, "LOGIN_SUCCESS");
\n else strcpy(resp_pack.data, "LOGIN_FAIL");
\n }
\n resp_pack.op = pack.op;
\n resp_pack.data_len = htons(strlen(resp_pack.data));
\n send(client_fd, &resp_pack, sizeof(ProtocolPack), 0);
\n }
\n }
\n}<\/p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4f7f\u7528\u00a0epoll_wait\u00a0\u51fd\u6570\u7b49\u5f85\u4e8b\u4ef6\u53d1\u751f，\u5904\u7406\u65b0\u5ba2\u6237\u7aef\u8fde\u63a5\u548c\u5ba2\u6237\u7aef\u6570\u636e\u3002\u6839\u636e\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u64cd\u4f5c\u7801\u8c03\u7528\u76f8\u5e94\u7684\u5904\u7406\u51fd\u6570，\u5e76\u5c06\u7ed3\u679c\u5c01\u88c5\u5728\u534f\u8bae\u5305\u4e2d\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u3002<\/p>\n
3.1.9. \u5173\u95ed\u76d1\u542c\u5957\u63a5\u5b57\u548c\u6570\u636e\u5e93\u8fde\u63a5<\/h4>\n
close(listen_fd);
\nsqlite3_close(db); <\/p>\n3.2.\u7f16\u8bd1\u8fd0\u884c\u6b65\u9aa4<\/h3>\n
- \u7f16\u8bd1\u670d\u52a1\u5668： gcc server.c -o server -lsqlite3\n <\/li>\n
- \u7f16\u8bd1\u5ba2\u6237\u7aef： gcc client.c -o client\n <\/li>\n
- \u8fd0\u884c\u670d\u52a1\u5668： .\/server\n <\/li>\n
- \u65b0\u5f00\u7ec8\u7aef\u8fd0\u884c\u5ba2\u6237\u7aef： .\/client <\/li>\n
3.3. \u529f\u80fd\u5b9e\u73b0\u7ed3\u679c\u5c55\u793a<\/h3>\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250419094612-680370e48a31f.png\")
<\/p>\n3.4. \u6e90\u7801<\/h3>\n
3.4.1.\u00a0\u670d\u52a1\u5668\u7aef\u4ee3\u7801（server.c）<\/h4>\n
#include <stdio.h>
\n#include <stdlib.h>
\n#include <string.h>
\n#include <sys\/socket.h>
\n#include <arpa\/inet.h>
\n#include <sys\/epoll.h>
\n#include <sqlite3.h><\/p>\n#define MAX_EVENTS 100
\n#define BUF_SIZE 1024<\/p>\n\/\/ \u5b9a\u4e49\u901a\u4fe1\u534f\u8bae\u5305\u7ed3\u6784\u4f53
\ntypedef struct {
\n uint8_t op; \/\/ \u64cd\u4f5c\u7801，1\u8868\u793a\u6ce8\u518c，2\u8868\u793a\u767b\u5f55
\n uint16_t data_len; \/\/ \u6570\u636e\u957f\u5ea6（\u7f51\u7edc\u5b57\u8282\u5e8f）
\n char data[BUF_SIZE];\/\/ \u5b58\u50a8\u7528\u6237\u540d\u3001\u5bc6\u7801\u7b49\u6570\u636e
\n} ProtocolPack;<\/p>\n\/\/ \u521d\u59cb\u5316\u6570\u636e\u5e93
\nsqlite3* init_db() {
\n sqlite3* db;
\n \/\/ \u6253\u5f00\/\u521b\u5efa\u6570\u636e\u5e93\u6587\u4ef6 "user.db"
\n int rc = sqlite3_open("user.db", &db);
\n if (rc) {
\n fprintf(stderr, "Can't open database: %s\\\\n", sqlite3_errmsg(db));
\n exit(1);
\n }
\n \/\/ \u521b\u5efa\u7528\u6237\u8868（\u82e5\u4e0d\u5b58\u5728）
\n const char* sql = "CREATE TABLE IF NOT EXISTS users ("
\n "id INTEGER PRIMARY KEY AUTOINCREMENT,"
\n "username TEXT UNIQUE NOT NULL,"
\n "password TEXT NOT NULL)";
\n char* errmsg;
\n \/\/ \u6267\u884c\u5efa\u8868SQL
\n rc = sqlite3_exec(db, sql, 0, 0, &errmsg);
\n if (rc != SQLITE_OK) {
\n fprintf(stderr, "SQL error: %s\\\\n", errmsg);
\n sqlite3_free(errmsg);
\n }
\n return db;
\n}<\/p>\n\/\/ \u5904\u7406\u6ce8\u518c\u903b\u8f91
\nint handle_register(sqlite3* db, const char* username, const char* password) {
\n const char* sql = "INSERT INTO users (username, password) VALUES (?, ?)";
\n sqlite3_stmt* stmt;
\n \/\/ \u51c6\u5907SQL\u8bed\u53e5
\n int rc = sqlite3_prepare_v2(db, sql, -1, &stmt, 0);
\n if (rc != SQLITE_OK) return -1;<\/p>\n\/\/ \u7ed1\u5b9a\u7528\u6237\u540d\u548c\u5bc6\u7801\u53c2\u6570
\n sqlite3_bind_text(stmt, 1, username, -1, SQLITE_STATIC);
\n sqlite3_bind_text(stmt, 2, password, -1, SQLITE_STATIC);<\/p>\n\/\/ \u6267\u884c\u63d2\u5165\u64cd\u4f5c
\n rc = sqlite3_step(stmt);
\n if (rc == SQLITE_DONE) {
\n sqlite3_finalize(stmt);
\n return 0; \/\/ \u6ce8\u518c\u6210\u529f
\n }
\n if (rc == SQLITE_CONSTRAINT_UNIQUE) {
\n sqlite3_finalize(stmt);
\n return 1; \/\/ \u7528\u6237\u540d\u5df2\u5b58\u5728
\n }
\n sqlite3_finalize(stmt);
\n return -1;
\n}<\/p>\n\/\/ \u5904\u7406\u767b\u5f55\u903b\u8f91
\nint handle_login(sqlite3* db, const char* username, const char* password) {
\n const char* sql = "SELECT COUNT(*) FROM users WHERE username=? AND password=?";
\n sqlite3_stmt* stmt;
\n \/\/ \u51c6\u5907SQL\u8bed\u53e5
\n int rc = sqlite3_prepare_v2(db, sql, -1, &stmt, 0);
\n if (rc != SQLITE_OK) return -1;<\/p>\n\/\/ \u7ed1\u5b9a\u7528\u6237\u540d\u548c\u5bc6\u7801\u53c2\u6570
\n sqlite3_bind_text(stmt, 1, username, -1, SQLITE_STATIC);
\n sqlite3_bind_text(stmt, 2, password, -1, SQLITE_STATIC);<\/p>\n\/\/ \u6267\u884c\u67e5\u8be2\u64cd\u4f5c
\n rc = sqlite3_step(stmt);
\n if (rc == SQLITE_ROW) {
\n int count = sqlite3_column_int(stmt, 0);
\n sqlite3_finalize(stmt);
\n return count == 1 ? 0 : -1; \/\/ \u767b\u5f55\u6210\u529f\u8fd4\u56de0，\u5426\u5219\u5931\u8d25
\n }
\n sqlite3_finalize(stmt);
\n return -1;
\n}<\/p>\nint main() {
\n sqlite3* db = init_db(); \/\/ \u521d\u59cb\u5316\u6570\u636e\u5e93<\/p>\n\/\/ \u521b\u5efa\u76d1\u542c\u5957\u63a5\u5b57
\n int listen_fd = socket(AF_INET, SOCK_STREAM, 0);
\n struct sockaddr_in addr = {
\n .sin_family = AF_INET,
\n .sin_port = htons(8888),
\n .sin_addr.s_addr = INADDR_ANY
\n };
\n \/\/ \u7ed1\u5b9a\u5730\u5740
\n bind(listen_fd, (struct sockaddr*)&addr, sizeof(addr));
\n \/\/ \u5f00\u59cb\u76d1\u542c
\n listen(listen_fd, 5);<\/p>\n\/\/ \u521b\u5efaepoll\u5b9e\u4f8b
\n int epoll_fd = epoll_create1(0);
\n struct epoll_event ev, events[MAX_EVENTS];
\n ev.events = EPOLLIN;
\n ev.data.fd = listen_fd;
\n \/\/ \u5c06\u76d1\u542c\u5957\u63a5\u5b57\u52a0\u5165epoll\u76d1\u63a7
\n epoll_ctl(epoll_fd, EPOLL_CTL_ADD, listen_fd, &ev);<\/p>\nwhile (1) {
\n \/\/ \u7b49\u5f85\u4e8b\u4ef6\u53d1\u751f
\n int nfds = epoll_wait(epoll_fd, events, MAX_EVENTS, -1);
\n for (int i = 0; i < nfds; i++) {
\n if (events[i].data.fd == listen_fd) { \/\/ \u65b0\u5ba2\u6237\u7aef\u8fde\u63a5
\n int client_fd = accept(listen_fd, NULL, NULL);
\n ev.events = EPOLLIN;
\n ev.data.fd = client_fd;
\n \/\/ \u5c06\u5ba2\u6237\u7aef\u5957\u63a5\u5b57\u52a0\u5165epoll\u76d1\u63a7
\n epoll_ctl(epoll_fd, EPOLL_CTL_ADD, client_fd, &ev);
\n } else { \/\/ \u5904\u7406\u5ba2\u6237\u7aef\u6570\u636e
\n int client_fd = events[i].data.fd;
\n ProtocolPack pack;
\n \/\/ \u63a5\u6536\u534f\u8bae\u5305
\n if (recv(client_fd, &pack, sizeof(ProtocolPack), 0) <= 0) {
\n epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client_fd, NULL);
\n close(client_fd);
\n continue;
\n }<\/p>\nchar username[32] = {0}, password[32] = {0};
\n \/\/ \u89e3\u6790\u6570\u636e\u5185\u5bb9
\n sscanf(pack.data, "%31s %31s", username, password);<\/p>\nProtocolPack resp_pack = {0};
\n if (pack.op == 1) { \/\/ \u5904\u7406\u6ce8\u518c\u8bf7\u6c42
\n int result = handle_register(db, username, password);
\n if (result == 0) strcpy(resp_pack.data, "REGISTER_SUCCESS");
\n else if (result == 1) strcpy(resp_pack.data, "USER_EXISTS");
\n else strcpy(resp_pack.data, "REGISTER_FAIL");
\n } else if (pack.op == 2) { \/\/ \u5904\u7406\u767b\u5f55\u8bf7\u6c42
\n int result = handle_login(db, username, password);
\n if (result == 0) strcpy(resp_pack.data, "LOGIN_SUCCESS");
\n else strcpy(resp_pack.data, "LOGIN_FAIL");
\n }
\n resp_pack.op = pack.op;
\n resp_pack.data_len = htons(strlen(resp_pack.data));
\n \/\/ \u53d1\u9001\u54cd\u5e94\u534f\u8bae\u5305
\n send(client_fd, &resp_pack, sizeof(ProtocolPack), 0);
\n }
\n }
\n }
\n close(listen_fd);
\n sqlite3_close(db);
\n return 0;
\n} <\/p>\n3.4.2.\u00a0\u5ba2\u6237\u7aef\u4ee3\u7801（client.c）<\/h4>\n
#include <stdio.h>
\n#include <stdlib.h>
\n#include <string.h>
\n#include <sys\/socket.h>
\n#include <arpa\/inet.h><\/p>\n#define BUF_SIZE 1024<\/p>\n
\/\/ \u5b9a\u4e49\u901a\u4fe1\u534f\u8bae\u5305\u7ed3\u6784\u4f53
\ntypedef struct {
\n uint8_t op; \/\/ \u64cd\u4f5c\u7801，1\u8868\u793a\u6ce8\u518c，2\u8868\u793a\u767b\u5f55
\n uint16_t data_len; \/\/ \u6570\u636e\u957f\u5ea6（\u7f51\u7edc\u5b57\u8282\u5e8f）
\n char data[BUF_SIZE];\/\/ \u5b58\u50a8\u7528\u6237\u540d\u3001\u5bc6\u7801\u7b49\u6570\u636e
\n} ProtocolPack;<\/p>\nint main() {
\n \/\/ \u521b\u5efa\u5957\u63a5\u5b57
\n int sock = socket(AF_INET, SOCK_STREAM, 0);
\n struct sockaddr_in addr = {
\n .sin_family = AF_INET,
\n .sin_port = htons(8888)
\n };
\n \/\/ \u8bbe\u7f6e\u670d\u52a1\u5668IP
\n inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr);
\n \/\/ \u8fde\u63a5\u670d\u52a1\u5668
\n connect(sock, (struct sockaddr*)&addr, sizeof(addr));<\/p>\nProtocolPack pack = {0};
\n int choice;
\n printf("1. \u6ce8\u518c\\\\n2. \u767b\u5f55\\\\n\u9009\u62e9: ");
\n scanf("%d", &choice);<\/p>\nchar username[32], password[32];
\n printf("\u7528\u6237\u540d: ");
\n scanf("%31s", username);
\n printf("\u5bc6\u7801: ");
\n scanf("%31s", password);<\/p>\npack.op = (uint8_t)choice;
\n \/\/ \u6784\u5efa\u6570\u636e\u5185\u5bb9
\n sprintf(pack.data, "%s %s", username, password);
\n pack.data_len = htons(strlen(pack.data));<\/p>\n\/\/ \u53d1\u9001\u534f\u8bae\u5305
\n send(sock, &pack, sizeof(ProtocolPack), 0);<\/p>\nProtocolPack resp_pack;
\n \/\/ \u63a5\u6536\u54cd\u5e94\u534f\u8bae\u5305
\n recv(sock, &resp_pack, sizeof(ProtocolPack), 0);
\n printf("\u7ed3\u679c: %s\\\\n", resp_pack.data);<\/p>\nclose(sock);
\n return 0;
\n} <\/p>\n","protected":false},"excerpt":{"rendered":"\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb1k\u6b21\uff0c\u70b9\u8d5e18\u6b21\uff0c\u6536\u85cf23\u6b21\u3002\u5b9e\u73b0\u4e86\u4e00\u4e2a\u7b80\u5355\u7684\u7528\u6237\u6ce8\u518c\u548c\u767b\u5f55\u7cfb\u7edf\uff0c\u91c7\u7528\u5ba2\u6237\u7aef – \u670d\u52a1\u5668\uff08C\/S\uff09\u67b6\u6784\u3002<\/p>\n","protected":false},"author":2,"featured_media":26966,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[43,44],"topic":[],"class_list":["post-26967","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-43","tag-44"],"yoast_head":"\n
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\u670d\u52a1\u5668\uff08C\/S\uff09\u67b6\u6784\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/26967.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2025-04-19T09:46:13+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250419094612-680370e48a31f.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/26967.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/26967.html\",\"name\":\"\u57fa\u4e8elinuxC\u7ed3\u5408epoll + TCP \u670d\u52a1\u5668\u5ba2\u6237\u7aef + \u6570\u636e\u5e93\u5b9e\u73b0\u4e00\u4e2a\u6ce8\u518c\u767b\u5f55\u529f\u80fd - 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