下面有个例子，基于 Windows 的，编译完，运行 : WebSrv 7070 即可。在程序的目录中放一个 index.html 文件。
/*************************************************************************
*
* Copyright (c) 2002-2005 by Zhang Huiyong All Rights Reserved
*
* FILENAME: WebSrv.c
*
* PURPOSE : HTTP 服务器程序, 向客户端提供请求的文件内容.
*
* AUTHOR : 张会勇
*
* BOOK : <>
*
**************************************************************************/
#include
#include
#pragma comment(lib, "ws2_32.lib") /* WinSock使用的库函数 */
/* 定义常量 */
#define HTTP_DEF_PORT 80 /* 连接的缺省端口 */
#define HTTP_BUF_SIZE 1024 /* 缓冲区的大小 */
#define HTTP_FILENAME_LEN 256 /* 文件名长度 */
/* 定义文件类型对应的 Content-Type */
struct doc_type
{
char *suffix; /* 文件后缀 */
char *type; /* Content-Type */
};
struct doc_type file_type[] =
{
{"html", "text/html" },
{"gif", "image/gif" },
{"jpeg", "image/jpeg" },
{ NULL, NULL }
};
char *http_res_hdr_tmpl = "HTTP/1.1 200 OK\r\nServer: Huiyong's Server <0.1>\r\n"
"Accept-Ranges: bytes\r\nContent-Length: %d\r\nConnection: close\r\n"
"Content-Type: %s\r\n\r\n";
/**************************************************************************
*
* 函数功能: 根据文件后缀查找对应的 Content-Type.
*
* 参数说明: [IN] suffix, 文件名后缀;
*
* 返 回 值: 成功返回文件对应的 Content-Type, 失败返回 NULL.
*
**************************************************************************/
char *http_get_type_by_suffix(const char *suffix)
{
struct doc_type *type;
for (type = file_type; type->suffix; type++)
{
if (strcmp(type->suffix, suffix) == 0)
return type->type;
}
return NULL;
}
/**************************************************************************
*
* 函数功能: 解析请求行, 得到文件名及其后缀. 请求行格式:
* [GET http://www.baidu.com:8080/index.html HTTP/1.1]
*
* 参数说明: [IN] buf, 字符串指针数组;
* [IN] buflen, buf 的长度;
* [OUT] file_name, 文件名;
* [OUT] suffix, 文件名后缀;
*
* 返 回 值: void.
*
**************************************************************************/
void http_parse_request_cmd(char *buf, int buflen, char *file_name, char *suffix)
{
int length = 0;
char *begin, *end, *bias;
/* 查找 URL 的开始位置 */
begin = strchr(buf, ' ');
begin += 1;
/* 查找 URL 的结束位置 */
end = strchr(begin, ' ');
*end = 0;
bias = strrchr(begin, '/');
length = end - bias;
/* 找到文件名的开始位置 */
if ((*bias == '/') || (*bias == '\\'))
{
bias++;
length--;
}
/* 得到文件名 */
if (length > 0)
{
memcpy(file_name, bias, length);
file_name[length] = 0;
begin = strchr(file_name, '.');
if (begin)
strcpy(suffix, begin + 1);
}
}
/**************************************************************************
*
* 函数功能: 向客户端发送 HTTP 响应.
*
* 参数说明: [IN] buf, 字符串指针数组;
* [IN] buf_len, buf 的长度;
*
* 返 回 值: 成功返回非0, 失败返回0.
*
**************************************************************************/
int http_send_response(SOCKET soc, char *buf, int buf_len)
{
int read_len, file_len, hdr_len, send_len;
char *type;
char read_buf[HTTP_BUF_SIZE];
char http_header[HTTP_BUF_SIZE];
char file_name[HTTP_FILENAME_LEN] = "index.html", suffix[16] = "html";
FILE *res_file;
/* 得到文件名和后缀 */
http_parse_request_cmd(buf, buf_len, file_name, suffix);
res_file = fopen(file_name, "rb+"); /* 用二进制格式打开文件 */
if (res_file == NULL)
{
printf("[Web] The file [%s] is not existed\n", file_name);
return 0;
}
fseek(res_file, 0, SEEK_END);
file_len = ftell(res_file);
fseek(res_file, 0, SEEK_SET);
type = http_get_type_by_suffix(suffix); /* 文件对应的 Content-Type */
if (type == NULL)
{
printf("[Web] There is not the related content type\n");
return 0;
}
/* 构造 HTTP 首部，并发送 */
hdr_len = sprintf(http_header, http_res_hdr_tmpl, file_len, type);
send_len = send(soc, http_header, hdr_len, 0);
if (send_len == SOCKET_ERROR)
{
fclose(res_file);
printf("[Web] Fail to send, error = %d\n", WSAGetLastError());
return 0;
}
do /* 发送文件, HTTP 的消息体 */
{
read_len = fread(read_buf, sizeof(char), HTTP_BUF_SIZE, res_file);
if (read_len > 0)
{
send_len = send(soc, read_buf, read_len, 0);
file_len -= read_len;
}
} while ((read_len > 0) && (file_len > 0));
fclose(res_file);
return 1;
}
int main(int argc, char **argv)
{
WSADATA wsa_data;
SOCKET srv_soc = 0, acpt_soc; /* socket 句柄 */
struct sockaddr_in serv_addr; /* 服务器地址 */
struct sockaddr_in from_addr; /* 客户端地址 */
char recv_buf[HTTP_BUF_SIZE];
unsigned short port = HTTP_DEF_PORT;
unsigned long from_len = sizeof(from_addr);
int result = 0, recv_len;
if (argc == 2) /* 端口号 */
port = atoi(argv[1]);
WSAStartup(MAKEWORD(2,0), &wsa_data); /* 初始化 WinSock 资源 */
srv_soc = socket(AF_INET, SOCK_STREAM, 0); /* 创建 socket */
if (srv_soc == INVALID_SOCKET)
{
printf("[Web] socket() Fails, error = %d\n", WSAGetLastError());
return -1;
}
/* 服务器地址 */
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(port);
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
result = bind(srv_soc, (struct sockaddr *) &serv_addr, sizeof(serv_addr));
if (result == SOCKET_ERROR) /* 绑定失败 */
{
closesocket(srv_soc);
printf("[Web] Fail to bind, error = %d\n", WSAGetLastError());
return -1;
}
result = listen(srv_soc, SOMAXCONN);
printf("[Web] The server is running ... ...\n");
while (1)
{
acpt_soc = accept(srv_soc, (struct sockaddr *) &from_addr, &from_len);
if (acpt_soc == INVALID_SOCKET) /* 接受失败 */
{
printf("[Web] Fail to accept, error = %d\n", WSAGetLastError());
break;
}
printf("[Web] Accepted address:[%s], port:[%d]\n",
inet_ntoa(from_addr.sin_addr), ntohs(from_addr.sin_port));
recv_len = recv(acpt_soc, recv_buf, HTTP_BUF_SIZE, 0);
if (recv_len == SOCKET_ERROR) /* 接收失败 */
{
closesocket(acpt_soc);
printf("[Web] Fail to recv, error = %d\n", WSAGetLastError());
break;
}
recv_buf[recv_len] = 0;
/* 向客户端发送响应数据 */
result = http_send_response(acpt_soc, recv_buf, recv_len);
closesocket(acpt_soc);
}
closesocket(srv_soc);
WSACleanup();
printf("[Web] The server is stopped.\n");
return 0;
}
