strcmp() strcasecmp() strncasecmp() strlen()

本文介绍了PHP中字符串比较的方法,包括区分大小写的strcmp()与不区分大小写的strcasecmp()及strncasecmp()函数,并展示了获取字符串长度的strlen()函数用法。

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    $first = 'Pear';
    $second = "peach";

// int strcmp(string str1, string str2)
// CASE SENSITIVE
    echo "$first STRCMP $second, result is : ";
    echo strcmp($first, $second);
    echo "/n/n";
    echo strcmp("Hello", "hello");
    echo "/n/n";

// int strcasecmp(string str1, string str2)
// CASE NON-SENSITIVE
    echo "$first STRCASECMP $second, result is : ";
    echo strcasecmp($first, $second);
    echo "/n/n";
    echo strcasecmp("Hello", "hello");
    echo "/n/n";

// int strncasecmp(string str1, string str2, int length)
// CASE NON-SENITIVE
    echo "$first STRNCASECMP $second, result is : ";
    echo strncasecmp($first, $second, 5);
    echo "/n/n";
    echo strncasecmp("Hello", "hello", 4);
    echo "/n/n";

//    strlen ---- Get the string length
//    int strlen(string str)
    echo strlen('abcdef');
    echo "/n";
?>

#include <stdio.h> #include <stdbool.h> #include <sys/socket.h> #include <sys/types.h> #include <netinet/in.h> #include <arpa/inet.h> #include <unistd.h> #include <ctype.h> #include <strings.h> #include <string.h> #include <sys/stat.h> #include <pthread.h> #include <sys/wait.h> #include <stdlib.h> // 宏定义,是否是空格 #define ISspace(x) isspace((int)(x)) #define SERVER_STRING "Server: jdbhttpd/0.1.0\r\n" // 每次收到请求,创建一个线程来处理接受到的请求 // 把client_sock转成地址作为参数传入pthread_create void accept_request(void *arg); void bad_request(int); void cat(int, FILE *); void cannot_execute(int); void error_die(const char *); void execute_cgi(int, const char *, const char *, const char *); int get_line(int, char *, int); // 返回http头 void headers(int, const char *); void not_found(int); void serve_file(int, const char *); int startup(u_short *); void unimplemented(int); void normalize_path(char *path) { char *p = path; char *q = path; while (*p) { if (strncmp(p, "/../", 4) == 0) { p += 3; while (q > path && *--q != '/') ; } else if (strncmp(p, "/./", 3) == 0) { p += 2; } else if (strncmp(p, "//", 2) == 0) { p += 1; } else { *q++ = *p++; } } *q = '\0'; } /**********************************************************************/ /* A request has caused a call to accept() on the server port to * return. Process the request appropriately. * Parameters: the socket connected to the client */ /**********************************************************************/ void accept_request(void *arg) { int client = (intptr_t)arg; char buf[1024]; char method[255]; char url[255]; char path[512]; struct stat st; int cgi = 0; char *query_string = NULL; int numchars = get_line(client, buf, sizeof(buf)); size_t i = 0; size_t j = 0; while (!ISspace(buf[j]) && (i < sizeof(method) - 1)) { method[i] = buf[j]; i++; j++; } method[i] = '\0'; /* 判断是Get还是Post,否则501 Not Implemented */ if (strcasecmp(method, "GET") && strcasecmp(method, "POST")) { unimplemented(client); return; } /* 如果是POST,cgi置为1 */ if (strcasecmp(method, "POST") == 0) { cgi = 1; } i = 0; while (ISspace(buf[j]) && (j < sizeof(buf))) { j++; } while (!ISspace(buf[j]) && (i < sizeof(url) - 1) && (j < sizeof(buf))) { url[i] = buf[j]; i++; j++; } url[i] = '\0'; /* 判断Get请求 */ if (strcasecmp(method, "GET") == 0) { query_string = url; while ((*query_string != '?') && (*query_string != '\0')) query_string++; if (*query_string == '?') { cgi = 1; *query_string = '\0'; query_string++; } } // 路径 sprintf(path, "htdocs%s", url); // 默认地址,解析到的路径如果为/,则自动加上index.html if (path[strlen(path) - 1] == '/') strcat(path, "Index.html"); // 获得文件信息 if (stat(path, &st) == -1) { // 把所有http信息读出然后丢弃 while ((numchars > 0) && strcmp("\n", buf)) /* read & discard headers */ numchars = get_line(client, buf, sizeof(buf)); // 没有找到 not_found(client); } else { if ((st.st_mode & S_IFMT) == S_IFDIR) strcat(path, "/Index.html"); // 如果你的文件默认是有执行权限的,自动解析成cgi程序,如果有执行权限但是不能执行,会接受到报错信号 if ((st.st_mode & S_IXUSR) || (st.st_mode & S_IXGRP) || (st.st_mode & S_IXOTH)) cgi = 1; if (!cgi) // 接读取文件返回给请求的http客户端 serve_file(client, path); else // 执行cgi文件 execute_cgi(client, path, method, query_string); } // 执行完毕关闭socket close(client); } /**********************************************************************/ /* Inform the client that a request it has made has a problem. * Parameters: client socket */ /**********************************************************************/ void bad_request(int client) { char buf[1024]; sprintf(buf, "HTTP/1.0 400 BAD REQUEST\r\n"); send(client, buf, sizeof(buf), 0); sprintf(buf, "Content-type: text/html\r\n"); send(client, buf, sizeof(buf), 0); sprintf(buf, "\r\n"); send(client, buf, sizeof(buf), 0); sprintf(buf, "<P>Your browser sent a bad request, "); send(client, buf, sizeof(buf), 0); sprintf(buf, "such as a POST without a Content-Length.\r\n"); send(client, buf, sizeof(buf), 0); } /*! * @brief 将文件内容发送到网络客户端 * * @param[in] client 客户端套接字描述符 * @param[in] resource 文件指针(指向要发送的文件) */ void cat(int client, FILE *resource) { char buf[1024]; size_t bytes_read; while ((bytes_read = fread(buf, 1, sizeof(buf), resource)) > 0) { if (send(client, buf, bytes_read, 0) < bytes_read) { perror("send"); break; } } } /**********************************************************************/ /* Inform the client that a CGI script could not be executed. * Parameter: the client socket descriptor. */ /**********************************************************************/ void cannot_execute(int client) { char buf[1024]; sprintf(buf, "HTTP/1.0 500 Internal Server Error\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "Content-type: text/html\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "<P>Error prohibited CGI execution.\r\n"); send(client, buf, strlen(buf), 0); } /**********************************************************************/ /* Print out an error message with perror() (for system errors; based * on value of errno, which indicates system call errors) and exit the * program indicating an error. */ /**********************************************************************/ void error_die(const char *sc) { perror(sc); exit(1); } /**********************************************************************/ /* Execute a CGI script. Will need to set environment variables as * appropriate. * Parameters: client socket descriptor * path to the CGI script */ /**********************************************************************/ void execute_cgi(int client, const char *path, const char *method, const char *query_string) { // 缓冲区 char buf[1024]; int cgi_output[2]; int cgi_input[2]; pid_t pid; int status; int i = 0; char c; int numchars = 1; int content_length = -1; // 默认字符 buf[0] = 'A'; buf[1] = '\0'; // 忽略大小写比较字符串 if (strcasecmp(method, "GET") == 0) while ((numchars > 0) && strcmp("\n", buf)) /* read & discard headers */ numchars = get_line(client, buf, sizeof(buf)); else /* POST */ { numchars = get_line(client, buf, sizeof(buf)); while ((numchars > 0) && strcmp("\n", buf)) { // 如果是POST请求,就需要得到Content-Length,Content-Length:这个字符串一共长为15位,所以 // 取出头部一句后,将第16位设置结束符,进行比较 // 第16位置为结束 buf[15] = '\0'; if (strcasecmp(buf, "Content-Length:") == 0) // 内存从第17位开始就是长度,将17位开始的所有字符串转成整数就是content_length content_length = atoi(&(buf[16])); numchars = get_line(client, buf, sizeof(buf)); } if (content_length == -1) { bad_request(client); return; } } sprintf(buf, "HTTP/1.0 200 OK\r\n"); send(client, buf, strlen(buf), 0); // 建立output管道 if (pipe(cgi_output) < 0) { cannot_execute(client); return; } // 建立input管道 if (pipe(cgi_input) < 0) { cannot_execute(client); return; } if ((pid = fork()) < 0) { cannot_execute(client); return; } if (pid == 0) /* child: CGI script */ { char meth_env[255]; char query_env[255]; char length_env[255]; // 子进程输出重定向到output管道的1端 dup2(cgi_output[1], 1); // 子进程输入重定向到input管道的0端 dup2(cgi_input[0], 0); // 关闭无用管道口 close(cgi_output[0]); close(cgi_input[1]); // CGI环境变量 sprintf(meth_env, "REQUEST_METHOD=%s", method); putenv(meth_env); if (strcasecmp(method, "GET") == 0) { sprintf(query_env, "QUERY_STRING=%s", query_string); putenv(query_env); } else { /* POST */ sprintf(length_env, "CONTENT_LENGTH=%d", content_length); putenv(length_env); } // 替换执行path execl(path, path, NULL); // int m = execl(path, path, NULL); // 如果path有问题,例如将html网页改成可执行的,但是执行后m为-1 // 退出子进程,管道被破坏,但是父进程还在往里面写东西,触发Program received signal SIGPIPE, Broken pipe. exit(0); } else { /* parent */ close(cgi_output[1]); close(cgi_input[0]); if (strcasecmp(method, "POST") == 0) for (i = 0; i < content_length; i++) { recv(client, &c, 1, 0); ssize_t bytes_written = write(cgi_input[1], &c, 1); if (bytes_written <= 0) { // 错误处理 perror("Failed to write to CGI"); close(cgi_input[1]); close(cgi_input[0]); break; } } // 从output管道读到子进程处理后的信息,然后send出去 while (read(cgi_output[0], &c, 1) > 0) send(client, &c, 1, 0); // 完成操作后关闭管道 close(cgi_output[0]); close(cgi_input[1]); // 等待子进程返回 waitpid(pid, &status, 0); } } /**********************************************************************/ /* Get a line from a socket, whether the line ends in a newline, * carriage return, or a CRLF combination. Terminates the string read * with a null character. If no newline indicator is found before the * end of the buffer, the string is terminated with a null. If any of * the above three line terminators is read, the last character of the * string will be a linefeed and the string will be terminated with a * null character. * Parameters: the socket descriptor * the buffer to save the data in * the size of the buffer * Returns: the number of bytes stored (excluding null) */ /**********************************************************************/ // 得到一行数据,只要发现c为\n,就认为是一行结束,如果读到\r,再用MSG_PEEK的方式读入一个字符,如果是\n,从socket用读出 // 如果是下个字符则不处理,将c置为\n,结束。如果读到的数据为0中断,或者小于0,也视为结束,c置为\n int get_line(int sock, char *buf, int size) { int i = 0; char c = '\0'; int n; while ((i < size - 1) && (c != '\n')) { n = recv(sock, &c, 1, 0); /* DEBUG printf("%02X\n", c); */ if (n > 0) { if (c == '\r') { // 偷窥一个字节,如果是\n就读走 n = recv(sock, &c, 1, MSG_PEEK); /* DEBUG printf("%02X\n", c); */ if ((n > 0) && (c == '\n')) recv(sock, &c, 1, 0); else // 不是\n(读到下一行的字符)或者没读到,置c为\n 跳出循环,完成一行读取 c = '\n'; } buf[i] = c; i++; } else c = '\n'; } buf[i] = '\0'; return (i); } /**********************************************************************/ /* Return the informational HTTP headers about a file. */ /* Parameters: the socket to print the headers on * the name of the file */ /**********************************************************************/ // 加入http的headers const char *get_content_type(const char *path) { const char *ext = strrchr(path, '.'); if (ext) { if (strcasecmp(ext, ".css") == 0) return "text/css"; if (strcasecmp(ext, ".js") == 0) return "application/javascript"; if (strcasecmp(ext, ".png") == 0) return "image/png"; if (strcasecmp(ext, ".jpg") == 0 || strcasecmp(ext, ".jpeg") == 0) return "image/jpeg"; if (strcasecmp(ext, ".gif") == 0) return "image/gif"; if (strcasecmp(ext, ".ico") == 0) return "image/x-icon"; if (strcasecmp(ext, ".svg") == 0) return "image/svg+xml"; if (strcasecmp(ext, ".woff") == 0) return "font/woff"; if (strcasecmp(ext, ".woff2") == 0) return "font/woff2"; } return "text/html"; } /*! * @brief * * @param[in] client Comment * @param[in] filename Comment */ void headers(int client, const char *filename) { char buf[1024]; const char *content_type = get_content_type(filename); sprintf(buf, "HTTP/1.0 200 OK\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, SERVER_STRING); send(client, buf, strlen(buf), 0); sprintf(buf, "Content-Type: %s\r\n", content_type); send(client, buf, strlen(buf), 0); sprintf(buf, "\r\n"); send(client, buf, strlen(buf), 0); } /*! * @brief * * @param[in] client Comment */ void not_found(int client) { char buf[1024]; sprintf(buf, "HTTP/1.0 404 NOT FOUND\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, SERVER_STRING); send(client, buf, strlen(buf), 0); sprintf(buf, "Content-Type: text/html\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "<HTML><TITLE>Not Found</TITLE>\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "<BODY><P>The server could not fulfill\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "your request because the resource specified\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "is unavailable or nonexistent.\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "</BODY></HTML>\r\n"); send(client, buf, strlen(buf), 0); } /**********************************************************************/ /* Send a regular file to the client. Use headers, and report * errors to client if they occur. * Parameters: a pointer to a file structure produced from the socket * file descriptor * the name of the file to serve */ /**********************************************************************/ /*! * @brief 如果不是CGI文件,直接读取文件返回给请求的http客户端 * * @param[in] client Comment * @param[in] filename Comment */ void serve_file(int client, const char *filename) { FILE *resource = NULL; int numchars = 1; char buf[1024]; // 默认字符 buf[0] = 'A'; buf[1] = '\0'; while ((numchars > 0) && strcmp("\n", buf)) /* read & discard headers */ { numchars = get_line(client, buf, sizeof(buf)); } resource = fopen(filename, "rb"); printf("Serving file: %s\n", filename); if (resource == NULL) { not_found(client); } else { headers(client, filename); cat(client, resource); } fclose(resource); } /**********************************************************************/ /* This function starts the process of listening for web connections * on a specified port. If the port is 0, then dynamically allocate a * port and modify the original port variable to reflect the actual * port. * Parameters: pointer to variable containing the port to connect on * Returns: the socket */ /**********************************************************************/ int startup(u_short *port) { int httpd = 0; struct sockaddr_in name; httpd = socket(PF_INET, SOCK_STREAM, 0); if (httpd == -1) { error_die("socket"); } memset(&name, 0, sizeof(name)); name.sin_family = AF_INET; name.sin_port = htons(*port); name.sin_addr.s_addr = htonl(INADDR_ANY); // 绑定socket if (bind(httpd, (struct sockaddr *)&name, sizeof(name)) < 0) { error_die("bind"); } // 如果端口没有设置,提供个随机端口 if (*port == 0) /* if dynamically allocating a port */ { socklen_t namelen = sizeof(name); if (getsockname(httpd, (struct sockaddr *)&name, &namelen) == -1) { error_die("getsockname"); } *port = ntohs(name.sin_port); } // 监听 if (listen(httpd, 5) < 0) error_die("listen"); return (httpd); } /**********************************************************************/ /* Inform the client that the requested web method has not been * implemented. * Parameter: the client socket */ /**********************************************************************/ // 如果方法没有实现,就返回此信息 void unimplemented(int client) { char buf[1024]; sprintf(buf, "HTTP/1.0 501 Method Not Implemented\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, SERVER_STRING); send(client, buf, strlen(buf), 0); sprintf(buf, "Content-Type: text/html\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "<HTML><HEAD><TITLE>Method Not Implemented\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "</TITLE></HEAD>\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "<BODY><P>HTTP request method not supported.\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "</BODY></HTML>\r\n"); send(client, buf, strlen(buf), 0); } /**********************************************************************/ int main(void) { int server_sock = -1; u_short port = 80; int client_sock = -1; struct sockaddr_in client_name; // 这边要为socklen_t类型 socklen_t client_name_len = sizeof(client_name); pthread_t newthread; server_sock = startup(&port); printf("httpd running on port %d\n", port); while (1) { client_sock = accept(server_sock, (struct sockaddr *)&client_name, &client_name_len); if (client_sock == -1) { error_die("accept"); } // 每次收到请求,创建一个线程来处理接受到的请求 // 把client_sock转成地址作为参数传入pthread_create if (pthread_create(&newthread, NULL, (void *)accept_request, (void *)(intptr_t)client_sock) != 0) { perror("pthread_create"); } } close(server_sock); return (0); } 修改代码实现以多线程方式实现web server功能(必修)
08-08
#include <stdio.h> #include <sys/socket.h> #include <sys/types.h> #include <netinet/in.h> #include <netinet/tcp.h> #include <arpa/inet.h> #include <unistd.h> #include <ctype.h> #include <strings.h> #include <string.h> #include <sys/stat.h> #include <pthread.h> #include <sys/wait.h> #include <stdlib.h> #include <dirent.h> #include <time.h> #include <errno.h> // 添加errno头文件 #define ISspace(x) isspace((int)(x)) #define SERVER_STRING “Server: jdbhttpd/0.2.0\r\n” // 函数声明 void* accept_request(void *); void error_die(const char *); int get_line(int, char *, int); void not_found(int); void serve_file(int, const char *); void serve_file_post(int, const char *); int startup(unsigned short *); void unimplemented(int); void forbidden(int); void serve_directory(int, const char *); void url_decode(char *, const char *); const char *get_mime_type(const char *); void log_request(const char *, const char *, int); void set_socket_timeout(int, int); // / 处理客户端请求 / // void* accept_request(void *pclient) { int client = (int)pclient; free(pclient); set_socket_timeout(client, 2); char buf[65536]; int numchars; char method[255]; char url[255]; char path[1024]; // 增加路径长度 char decoded_url[1024]; // 存储解码后的URL size_t i, j; struct stat st; // 获取请求的第一行 numchars = get_line(client, buf, sizeof(buf)); i = 0; j = 0; while (!ISspace(buf[j]) && (i < sizeof(method) - 1)) { method[i] = buf[j]; i++; j++; } method[i] = '\0'; // 只支持GET和POST方法 if (strcasecmp(method, "GET") && strcasecmp(method, "POST") && strcasecmp(method, "OPTIONS")) { unimplemented(client); return NULL; } // 读取URL i = 0; while (ISspace(buf[j]) && (j < sizeof(buf))) j++; while (!ISspace(buf[j]) && (i < sizeof(url) - 1) && (j < sizeof(buf))) { url[i] = buf[j]; i++; j++; } url[i] = '\0'; // URL解码 url_decode(decoded_url, url); // 记录请求日志 log_request(method, decoded_url, client); // 构建文件路径(使用当前目录) sprintf(path, "web%s", decoded_url); // 防止路径遍历攻击 if (strstr(path, "..")) { forbidden(client); close(client); return NULL; } // 处理目录请求 if (path[strlen(path) - 1] == '/') strcat(path, "Index.html"); // 检查文件/目录是否存在 if (stat(path, &st) == -1) { // 检查是否存在.html扩展名文件 char alt_path[1024]; sprintf(alt_path, "%s.html", path); if (stat(alt_path, &st) == 0) { strcpy(path, alt_path); } else { /* 跳过剩余头部 */ while ((numchars > 0) && strcmp("\n", buf)) numchars = get_line(client, buf, sizeof(buf)); not_found(client); close(client); return NULL; } } // 如果是目录 if ((st.st_mode & S_IFMT) == S_IFDIR) { // 检查目录中是否有index.html char index_path[1024]; sprintf(index_path, "%s/Index.html", path); if (stat(index_path, &st) == 0) { strcpy(path, index_path); } else { // 显示目录列表 serve_directory(client, path); close(client); return NULL; } } if (strcasecmp(method, "GET") == 0) { serve_file(client, path); } else if (strcasecmp(method, "POST") == 0) { serve_file_post(client, path); } close(client); return NULL; } // / URL解码 / // void url_decode(char *dest, const char *src) { char *p = dest; while (*src) { if (*src == ‘%’) { if (src[1] && src[2]) { char hex[3] = {src[1], src[2], ‘\0’}; *p++ = (char)strtol(hex, NULL, 16); src += 3; } else { *p++ = *src++; } } else if (*src == ‘+’) { *p++ = ’ '; src++; } else { *p++ = *src++; } } *p = ‘\0’; } // / 获取MIME类型 / // const char *get_mime_type(const char *filename) { const char *dot = strrchr(filename, ‘.’); if (!dot) return “text/plain”; if (strcasecmp(dot, ".html") == 0 || strcasecmp(dot, ".htm") == 0) return "text/html"; if (strcasecmp(dot, ".css") == 0) return "text/css"; if (strcasecmp(dot, ".js") == 0) return "application/javascript"; if (strcasecmp(dot, ".jpg") == 0 || strcasecmp(dot, ".jpeg") == 0) return "image/jpeg"; if (strcasecmp(dot, ".png") == 0) return "image/png"; if (strcasecmp(dot, ".gif") == 0) return "image/gif"; if (strcasecmp(dot, ".json") == 0) return "application/json"; if (strcasecmp(dot, ".ico") == 0) return "image/x-icon"; return "text/plain"; } // / 记录请求日志 / // void log_request(const char *method, const char *url, int client) { time_t now = time(NULL); struct tm *tm = localtime(&now); char timestamp[64]; strftime(timestamp, sizeof(timestamp), “%Y-%m-%d %H:%M:%S”, tm); struct sockaddr_in addr; socklen_t addr_len = sizeof(addr); getpeername(client, (struct sockaddr*)&addr, &addr_len); char *ip = inet_ntoa(addr.sin_addr); printf("[%s] %s %s %s\n", timestamp, ip, method, url); } // / 处理目录列表 / // void serve_directory(int client, const char *path) { char buf[4096]; // 发送HTTP头 sprintf(buf, "HTTP/1.0 200 OK\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, SERVER_STRING); send(client, buf, strlen(buf), 0); sprintf(buf, "Content-Type: text/html\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "\r\n"); send(client, buf, strlen(buf), 0); // 发送HTML头部 sprintf(buf, "<html><head><title>Index of %s</title></head>", path); send(client, buf, strlen(buf), 0); sprintf(buf, "<body><h1>Index of %s</h1><ul>", path); send(client, buf, strlen(buf), 0); // 打开目录 DIR *dir = opendir(path); if (dir) { struct dirent *ent; while ((ent = readdir(dir)) != NULL) { // 跳过隐藏文件 if (ent->d_name[0] == '.') continue; char full_path[1024]; sprintf(full_path, "%s/%s", path, ent->d_name); struct stat st; stat(full_path, &st); char size_buf[32]; if (S_ISDIR(st.st_mode)) { strcpy(size_buf, "[DIR]"); } else { if (st.st_size < 1024) { sprintf(size_buf, "%ld B", st.st_size); } else if (st.st_size < 1024 * 1024) { sprintf(size_buf, "%.1f KB", st.st_size / 1024.0); } else { sprintf(size_buf, "%.1f MB", st.st_size / (1024.0 * 1024)); } } sprintf(buf, "<li><a href=\"%s\">%s</a> - %s</li>", ent->d_name, ent->d_name, size_buf); send(client, buf, strlen(buf), 0); } closedir(dir); } // 发送HTML尾部 sprintf(buf, "</ul></body></html>\r\n"); send(client, buf, strlen(buf), 0); } // / 403 Forbidden / // void forbidden(int client) { char buf[1024]; sprintf(buf, "HTTP/1.0 403 Forbidden\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, SERVER_STRING); send(client, buf, strlen(buf), 0); sprintf(buf, "Content-Type: text/html\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "<html><body><h1>403 Forbidden</h1><p>Access to this resource is denied.</p></body></html>\r\n"); send(client, buf, strlen(buf), 0); } // / 错误处理 / // void error_die(const char *sc) { perror(sc); exit(1); } // / 读取一行 / // int get_line(int sock, char *buf, int size) { int i = 0; char c = ‘\0’; int n; while ((i < size - 1) && (c != '\n')) { n = recv(sock, &c, 1, 0); if (n > 0) { if (c == '\r') { n = recv(sock, &c, 1, MSG_PEEK); if ((n > 0) && (c == '\n')) recv(sock, &c, 1, 0); else c = '\n'; } buf[i] = c; i++; } else c = '\n'; } buf[i] = '\0'; return(i); } // / 404 Not Found / // void not_found(int client) { char buf[1024]; sprintf(buf, "HTTP/1.0 404 NOT FOUND\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, SERVER_STRING); send(client, buf, strlen(buf), 0); sprintf(buf, "Content-Type: text/html\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "<html><body><h1>404 Not Found</h1><p>The requested URL was not found on this server.</p></body></html>\r\n"); send(client, buf, strlen(buf), 0); } // / 服务静态文件(修复二进制文件处理) / // void serve_file(int client, const char *filename) { FILE *resource = NULL; int numchars = 1; char buf[1024]; size_t bytes_read; long file_size; // 丢弃请求头 buf[0] = 'A'; buf[1] = '\0'; while ((numchars > 0) && strcmp("\n", buf)) numchars = get_line(client, buf, sizeof(buf)); // 使用二进制模式打开文件 resource = fopen(filename, "rb"); if (resource == NULL) { not_found(client); return; } // 获取文件大小 fseek(resource, 0, SEEK_END); file_size = ftell(resource); fseek(resource, 0, SEEK_SET); // 发送HTTP头 const char *content_type = get_mime_type(filename); // 创建并发送头部 char header_buf[2048]; sprintf(header_buf, "HTTP/1.0 200 OK\r\n"); send(client, header_buf, strlen(header_buf), 0); sprintf(header_buf, SERVER_STRING); send(client, header_buf, strlen(header_buf), 0); sprintf(header_buf, "Content-Type: %s\r\n", content_type); send(client, header_buf, strlen(header_buf), 0); sprintf(header_buf, "Content-Length: %ld\r\n", file_size); send(client, header_buf, strlen(header_buf), 0); sprintf(header_buf, "\r\n"); send(client, header_buf, strlen(header_buf), 0); // 使用二进制模式发送文件内容 while ((bytes_read = fread(buf, 1, sizeof(buf), resource)) > 0) { ssize_t sent = send(client, buf, bytes_read, MSG_NOSIGNAL); if (sent < 0) { // 处理发送错误(如连接关闭) break; } } fclose(resource); } // / 服务静态文件(专为POST请求设计,包含请求体处理) / // void serve_file_post(int client, const char *filename) { FILE *resource = NULL; int numchars = 1; char buf[1024]; size_t bytes_read; long file_size; size_t content_length = 0; // 用于存储请求体长度 // 1. 读取并处理请求头 while ((numchars > 0) && strcmp("\n", buf) != 0) { numchars = get_line(client, buf, sizeof(buf)); // 解析Content-Length头部 if (strncasecmp(buf, "Content-Length:", 15) == 0) { char *endptr; unsigned long temp = strtoul(buf + 15, &endptr, 10); if (endptr != buf + 15 && temp <= SIZE_MAX) { content_length = (size_t)temp; } } } // 2. 读取并丢弃请求体 if (content_length > 0) { size_t total_read = 0; struct timeval tv; tv.tv_sec = 5; // 设置5秒超时 tv.tv_usec = 0; setsockopt(client, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)); while (total_read < content_length) { size_t to_read = sizeof(buf); size_t remaining = content_length - total_read; if (to_read > remaining) { to_read = remaining; } bytes_read = recv(client, buf, to_read, 0); if (bytes_read <= 0) { if (bytes_read == 0) { break; // 连接关闭 } else if (errno == EAGAIN || errno == EWOULDBLOCK) { fprintf(stderr, "Request body read timeout\n"); break; // 超时 } else { perror("recv failed"); break; // 错误 } } total_read += bytes_read; } // 恢复默认超时设置 tv.tv_sec = 0; tv.tv_usec = 0; setsockopt(client, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)); } // 3. 打开并发送文件(与serve_file相同) resource = fopen(filename, "rb"); if (resource == NULL) { not_found(client); return; } // 获取文件大小 fseek(resource, 0, SEEK_END); file_size = ftell(resource); fseek(resource, 0, SEEK_SET); // 发送HTTP头 const char *content_type = get_mime_type(filename); char header_buf[2048]; sprintf(header_buf, "HTTP/1.0 200 OK\r\n"); send(client, header_buf, strlen(header_buf), 0); sprintf(header_buf, SERVER_STRING); send(client, header_buf, strlen(header_buf), 0); sprintf(header_buf, "Content-Type: %s\r\n", content_type); send(client, header_buf, strlen(header_buf), 0); sprintf(header_buf, "Content-Length: %ld\r\n", file_size); send(client, header_buf, strlen(header_buf), 0); sprintf(header_buf, "\r\n"); send(client, header_buf, strlen(header_buf), 0); // 发送文件内容 while ((bytes_read = fread(buf, 1, sizeof(buf), resource)) > 0) { ssize_t sent = send(client, buf, bytes_read, MSG_NOSIGNAL); if (sent < 0) { // 处理发送错误 break; } } fclose(resource); } // / 启动服务器 / // int startup(unsigned short port) { int httpd = 0; struct sockaddr_in name; / 创建socket */ httpd = socket(PF_INET, SOCK_STREAM, 0); if (httpd == -1) error_die(“socket”); memset(&name, 0, sizeof(name)); name.sin_family = AF_INET; name.sin_port = htons(*port); name.sin_addr.s_addr = htonl(INADDR_ANY); /* 绑定地址 */ if (bind(httpd, (struct sockaddr *)&name, sizeof(name)) < 0) error_die("bind"); /* 若预设端口为0,随机取用可用端口*/ if (*port == 0) { socklen_t namelen = sizeof(name); if (getsockname(httpd, (struct sockaddr *)&name, &namelen) == -1) error_die("getsockname"); *port = ntohs(name.sin_port); } /* 监听连接 */ if (listen(httpd, 5) < 0) error_die("listen"); return(httpd); } // / 501 Not Implemented / // void unimplemented(int client) { char buf[1024]; sprintf(buf, "HTTP/1.0 501 Method Not Implemented\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, SERVER_STRING); send(client, buf, strlen(buf), 0); sprintf(buf, "Content-Type: text/html\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "<html><body><h1>501 Not Implemented</h1><p>The requested method is not implemented.</p></body></html>\r\n"); send(client, buf, strlen(buf), 0); } // 设置套接字发送超时(在主循环accept后调用) void set_socket_timeout(int sockfd, int timeout_sec) { struct timeval tv; tv.tv_sec = timeout_sec; // 超时秒数 tv.tv_usec = 0; if (setsockopt(sockfd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) < 0) { perror("setsockopt SO_SNDTIMEO failed"); } } // / 主函数 / // int main(void) { int server_sock = -1; unsigned short port = 8080; int client_sock = -1; struct sockaddr_in client_name; socklen_t client_name_len = sizeof(client_name); pthread_t newthread; server_sock = startup(&port); printf("HTTP server running on port %d\n", port); signal(SIGPIPE, SIG_IGN); while (1) { /* 接受连接 */ client_sock = accept(server_sock,(struct sockaddr *)&client_name,&client_name_len); if (client_sock == -1) { perror("accept"); continue; // 继续接受新连接,而不是退出 } // 动态分配内存传递socket描述符 int *pclient = malloc(sizeof(int)); if (!pclient) { perror("malloc failed"); close(client_sock); continue; } *pclient = client_sock; // 创建线程处理请求(不再在主线程设置超时) if (pthread_create(&newthread, NULL, accept_request, pclient) != 0) { perror("pthread_create"); free(pclient); close(client_sock); } else { // 分离线程,使其结束后自动释放资源 pthread_detach(newthread); } } close(server_sock); return(0); } 以上是使用多线程方式实现的简单webserver。 现在我想通过I/O多路复用的方式实现在单线程下对请求的并发处理 尽量复用以上代码
最新发布
08-15
#include <stdio.h> #include <sys/socket.h> #include <sys/types.h> #include <netinet/in.h> #include <netinet/tcp.h> #include <arpa/inet.h> #include <unistd.h> #include <ctype.h> #include <strings.h> #include <string.h> #include <sys/stat.h> #include <pthread.h> #include <sys/wait.h> #include <stdlib.h> #include <dirent.h> #include <time.h> #define ISspace(x) isspace((int)(x)) #define SERVER_STRING "Server: jdbhttpd/0.2.0\r\n" // 函数声明 void* accept_request(void *); void bad_request(int); void cat(int, FILE *); void cannot_execute(int); void error_die(const char *); int get_line(int, char *, int); void headers(int, const char *, const char *); void not_found(int); void serve_file(int, const char *); int startup(unsigned short *); void unimplemented(int); void forbidden(int); void serve_directory(int, const char *); void url_decode(char *, const char *); const char *get_mime_type(const char *); void log_request(const char *, const char *, int); void set_socket_timeout(int, int); /**********************************************************************/ /* 处理客户端请求 */ /**********************************************************************/ void* accept_request(void *pclient) { int client = *(int*)pclient; free(pclient); set_socket_timeout(client, 2); char buf[65536]; int numchars; char method[255]; char url[255]; char path[1024]; // 增加路径长度 char decoded_url[1024]; // 存储解码后的URL size_t i, j; struct stat st; // 获取请求的第一行 numchars = get_line(client, buf, sizeof(buf)); i = 0; j = 0; while (!ISspace(buf[j]) && (i < sizeof(method) - 1)) { method[i] = buf[j]; i++; j++; } method[i] = '\0'; // 只支持GET和POST方法 if (strcasecmp(method, "GET") && strcasecmp(method, "POST")) { unimplemented(client); return NULL; } // 读取URL i = 0; while (ISspace(buf[j]) && (j < sizeof(buf))) j++; while (!ISspace(buf[j]) && (i < sizeof(url) - 1) && (j < sizeof(buf))) { url[i] = buf[j]; i++; j++; } url[i] = '\0'; // URL解码 url_decode(decoded_url, url); // 记录请求日志 log_request(method, decoded_url, client); // 构建文件路径(使用当前目录) sprintf(path, "web%s", decoded_url); // 防止路径遍历攻击 if (strstr(path, "..")) { forbidden(client); close(client); return NULL; } // 处理目录请求 if (path[strlen(path) - 1] == '/') strcat(path, "Index.html"); // 检查文件/目录是否存在 if (stat(path, &st) == -1) { // 检查是否存在.html扩展名文件 char alt_path[1024]; sprintf(alt_path, "%s.html", path); if (stat(alt_path, &st) == 0) { strcpy(path, alt_path); } else { /* 跳过剩余头部 */ while ((numchars > 0) && strcmp("\n", buf)) numchars = get_line(client, buf, sizeof(buf)); not_found(client); close(client); return NULL; } } // 如果是目录 if ((st.st_mode & S_IFMT) == S_IFDIR) { // 检查目录中是否有index.html char index_path[1024]; sprintf(index_path, "%s/Index.html", path); if (stat(index_path, &st) == 0) { strcpy(path, index_path); } else { // 显示目录列表 serve_directory(client, path); close(client); return NULL; } } serve_file(client, path); close(client); return NULL; } /**********************************************************************/ /* URL解码 */ /**********************************************************************/ void url_decode(char *dest, const char *src) { char *p = dest; while (*src) { if (*src == '%') { if (src[1] && src[2]) { char hex[3] = {src[1], src[2], '\0'}; *p++ = (char)strtol(hex, NULL, 16); src += 3; } else { *p++ = *src++; } } else if (*src == '+') { *p++ = ' '; src++; } else { *p++ = *src++; } } *p = '\0'; } /**********************************************************************/ /* 获取MIME类型 */ /**********************************************************************/ const char *get_mime_type(const char *filename) { const char *dot = strrchr(filename, '.'); if (!dot) return "text/plain"; if (strcasecmp(dot, ".html") == 0 || strcasecmp(dot, ".htm") == 0) return "text/html"; if (strcasecmp(dot, ".css") == 0) return "text/css"; if (strcasecmp(dot, ".js") == 0) return "application/javascript"; if (strcasecmp(dot, ".jpg") == 0 || strcasecmp(dot, ".jpeg") == 0) return "image/jpeg"; if (strcasecmp(dot, ".png") == 0) return "image/png"; if (strcasecmp(dot, ".gif") == 0) return "image/gif"; if (strcasecmp(dot, ".json") == 0) return "application/json"; if (strcasecmp(dot, ".ico") == 0) return "image/x-icon"; return "text/plain"; } /**********************************************************************/ /* 记录请求日志 */ /**********************************************************************/ void log_request(const char *method, const char *url, int client) { time_t now = time(NULL); struct tm *tm = localtime(&now); char timestamp[64]; strftime(timestamp, sizeof(timestamp), "%Y-%m-%d %H:%M:%S", tm); struct sockaddr_in addr; socklen_t addr_len = sizeof(addr); getpeername(client, (struct sockaddr*)&addr, &addr_len); char *ip = inet_ntoa(addr.sin_addr); printf("[%s] %s %s %s\n", timestamp, ip, method, url); } /**********************************************************************/ /* 处理目录列表 */ /**********************************************************************/ void serve_directory(int client, const char *path) { char buf[4096]; // 发送HTTP头 sprintf(buf, "HTTP/1.0 200 OK\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, SERVER_STRING); send(client, buf, strlen(buf), 0); sprintf(buf, "Content-Type: text/html\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "\r\n"); send(client, buf, strlen(buf), 0); // 发送HTML头部 sprintf(buf, "<html><head><title>Index of %s</title></head>", path); send(client, buf, strlen(buf), 0); sprintf(buf, "<body><h1>Index of %s</h1><ul>", path); send(client, buf, strlen(buf), 0); // 打开目录 DIR *dir = opendir(path); if (dir) { struct dirent *ent; while ((ent = readdir(dir)) != NULL) { // 跳过隐藏文件 if (ent->d_name[0] == '.') continue; char full_path[1024]; sprintf(full_path, "%s/%s", path, ent->d_name); struct stat st; stat(full_path, &st); char size_buf[32]; if (S_ISDIR(st.st_mode)) { strcpy(size_buf, "[DIR]"); } else { if (st.st_size < 1024) { sprintf(size_buf, "%ld B", st.st_size); } else if (st.st_size < 1024 * 1024) { sprintf(size_buf, "%.1f KB", st.st_size / 1024.0); } else { sprintf(size_buf, "%.1f MB", st.st_size / (1024.0 * 1024)); } } sprintf(buf, "<li><a href=\"%s\">%s</a> - %s</li>", ent->d_name, ent->d_name, size_buf); send(client, buf, strlen(buf), 0); } closedir(dir); } // 发送HTML尾部 sprintf(buf, "</ul></body></html>\r\n"); send(client, buf, strlen(buf), 0); } /**********************************************************************/ /* 400 Bad Request */ /**********************************************************************/ void bad_request(int client) { char buf[1024]; sprintf(buf, "HTTP/1.0 400 BAD REQUEST\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "Content-type: text/html\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "<html><body><h1>400 Bad Request</h1></body></html>\r\n"); send(client, buf, strlen(buf), 0); } /**********************************************************************/ /* 403 Forbidden */ /**********************************************************************/ void forbidden(int client) { char buf[1024]; sprintf(buf, "HTTP/1.0 403 Forbidden\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, SERVER_STRING); send(client, buf, strlen(buf), 0); sprintf(buf, "Content-Type: text/html\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "<html><body><h1>403 Forbidden</h1><p>Access to this resource is denied.</p></body></html>\r\n"); send(client, buf, strlen(buf), 0); } /**********************************************************************/ /* 发送文件内容 */ /**********************************************************************/ void cat(int client, FILE *resource) { char buf[65536]; fgets(buf, sizeof(buf), resource); while (!feof(resource)) { send(client, buf, strlen(buf), 0); fgets(buf, sizeof(buf), resource); } } /**********************************************************************/ /* 500 Internal Server Error */ /**********************************************************************/ void cannot_execute(int client) { char buf[1024]; sprintf(buf, "HTTP/1.0 500 Internal Server Error\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "Content-type: text/html\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "<html><body><h1>500 Internal Server Error</h1><p>CGI execution failed.</p></body></html>\r\n"); send(client, buf, strlen(buf), 0); } /**********************************************************************/ /* 错误处理 */ /**********************************************************************/ void error_die(const char *sc) { perror(sc); exit(1); } /**********************************************************************/ /* 读取一行 */ /**********************************************************************/ int get_line(int sock, char *buf, int size) { int i = 0; char c = '\0'; int n; while ((i < size - 1) && (c != '\n')) { n = recv(sock, &c, 1, 0); if (n > 0) { if (c == '\r') { n = recv(sock, &c, 1, MSG_PEEK); if ((n > 0) && (c == '\n')) recv(sock, &c, 1, 0); else c = '\n'; } buf[i] = c; i++; } else c = '\n'; } buf[i] = '\0'; return(i); } /**********************************************************************/ /* 发送HTTP头 */ /**********************************************************************/ void headers(int client, const char *filename, const char *content_type) { char buf[1024]; (void)filename; // 未使用 strcpy(buf, "HTTP/1.0 200 OK\r\n"); send(client, buf, strlen(buf), 0); strcpy(buf, SERVER_STRING); send(client, buf, strlen(buf), 0); sprintf(buf, "Content-Type: %s\r\n", content_type); send(client, buf, strlen(buf), 0); strcpy(buf, "\r\n"); send(client, buf, strlen(buf), 0); } /**********************************************************************/ /* 404 Not Found */ /**********************************************************************/ void not_found(int client) { char buf[1024]; sprintf(buf, "HTTP/1.0 404 NOT FOUND\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, SERVER_STRING); send(client, buf, strlen(buf), 0); sprintf(buf, "Content-Type: text/html\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "<html><body><h1>404 Not Found</h1><p>The requested URL was not found on this server.</p></body></html>\r\n"); send(client, buf, strlen(buf), 0); } /**********************************************************************/ /* 服务静态文件(修复二进制文件处理) */ /**********************************************************************/ void serve_file(int client, const char *filename) { FILE *resource = NULL; int numchars = 1; char buf[1024]; size_t bytes_read; long file_size; // 丢弃请求头 buf[0] = 'A'; buf[1] = '\0'; while ((numchars > 0) && strcmp("\n", buf)) numchars = get_line(client, buf, sizeof(buf)); // 使用二进制模式打开文件 resource = fopen(filename, "rb"); if (resource == NULL) { not_found(client); return; } // 获取文件大小 fseek(resource, 0, SEEK_END); file_size = ftell(resource); fseek(resource, 0, SEEK_SET); // 发送HTTP头 const char *content_type = get_mime_type(filename); // 创建并发送头部 char header_buf[2048]; sprintf(header_buf, "HTTP/1.0 200 OK\r\n"); send(client, header_buf, strlen(header_buf), 0); sprintf(header_buf, SERVER_STRING); send(client, header_buf, strlen(header_buf), 0); sprintf(header_buf, "Content-Type: %s\r\n", content_type); send(client, header_buf, strlen(header_buf), 0); sprintf(header_buf, "Content-Length: %ld\r\n", file_size); send(client, header_buf, strlen(header_buf), 0); sprintf(header_buf, "\r\n"); send(client, header_buf, strlen(header_buf), 0); // 使用二进制模式发送文件内容 while ((bytes_read = fread(buf, 1, sizeof(buf), resource)) > 0) { ssize_t sent = send(client, buf, bytes_read, MSG_NOSIGNAL); if (sent < 0) { // 处理发送错误(如连接关闭) break; } } fclose(resource); } /**********************************************************************/ /* 启动服务器 */ /**********************************************************************/ int startup(unsigned short *port) { int httpd = 0; struct sockaddr_in name; /* 创建socket */ httpd = socket(PF_INET, SOCK_STREAM, 0); if (httpd == -1) error_die("socket"); memset(&name, 0, sizeof(name)); name.sin_family = AF_INET; name.sin_port = htons(*port); name.sin_addr.s_addr = htonl(INADDR_ANY); /* 绑定地址 */ if (bind(httpd, (struct sockaddr *)&name, sizeof(name)) < 0) error_die("bind"); /* 若预设端口为0,随机取用可用端口*/ if (*port == 0) { socklen_t namelen = sizeof(name); if (getsockname(httpd, (struct sockaddr *)&name, &namelen) == -1) error_die("getsockname"); *port = ntohs(name.sin_port); } /* 监听连接 */ if (listen(httpd, 5) < 0) error_die("listen"); return(httpd); } /**********************************************************************/ /* 501 Not Implemented */ /**********************************************************************/ void unimplemented(int client) { char buf[1024]; sprintf(buf, "HTTP/1.0 501 Method Not Implemented\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, SERVER_STRING); send(client, buf, strlen(buf), 0); sprintf(buf, "Content-Type: text/html\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "\r\n"); send(client, buf, strlen(buf), 0); sprintf(buf, "<html><body><h1>501 Not Implemented</h1><p>The requested method is not implemented.</p></body></html>\r\n"); send(client, buf, strlen(buf), 0); } // 设置套接字发送超时(在主循环accept后调用) void set_socket_timeout(int sockfd, int timeout_sec) { struct timeval tv; tv.tv_sec = timeout_sec; // 超时秒数 tv.tv_usec = 0; if (setsockopt(sockfd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) < 0) { perror("setsockopt SO_SNDTIMEO failed"); } } /**********************************************************************/ /* 主函数(多进程实现)*/ /**********************************************************************/ int main(void) { int server_sock = -1; unsigned short port = 8080; int client_sock = -1; struct sockaddr_in client_name; socklen_t client_name_len = sizeof(client_name); pid_t pid; // 设置SIGCHLD处理函数避免僵尸进程 struct sigaction sa; sa.sa_handler = SIG_IGN; // 忽略SIGCHLD信号,自动回收子进程 sigemptyset(&sa.sa_mask); sa.sa_flags = SA_RESTART; if (sigaction(SIGCHLD, &sa, NULL) == -1) { perror("sigaction"); exit(EXIT_FAILURE); } server_sock = startup(&port); printf("HTTP server running on port %d\n", port); signal(SIGPIPE, SIG_IGN); // 忽略SIGPIPE信号 while (1) { /* 接受连接 */ client_sock = accept(server_sock, (struct sockaddr *)&client_name, &client_name_len); if (client_sock == -1) { perror("accept"); continue; } /* 创建子进程处理请求 */ pid = fork(); if (pid < 0) { perror("fork"); close(client_sock); } else if (pid == 0) { // 子进程 close(server_sock); // 关闭监听套接字(子进程不需要) // 动态分配内存传递socket描述符 int *pclient = malloc(sizeof(int)); if (!pclient) { perror("malloc failed"); close(client_sock); exit(EXIT_FAILURE); } *pclient = client_sock; accept_request(pclient); // 处理请求 exit(EXIT_SUCCESS); // 子进程退出 } else { // 父进程 close(client_sock); // 关闭客户端套接字(父进程不需要) } } close(server_sock); return 0; } 在这版基础上改动,并注明改动位置
08-09
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