通过TCP / IP套接字（Web服务器）发送文件 [英] Sending a file over a TCP/IP socket (web server)
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问题描述
我正在编写网络服务器的准系统，但我无法弄清楚为什么我的文件不会通过我的套接字发送，我正在连接它而且它只是不是发送（）我的文件...我缺少什么？
I'm writing the barebones of a web server, but I can't figure out why my file isn't be sent over my socket, I'm connecting to it and everything it just not send()ing my file... What am I missing?
// CODE （server.c ）
//CODE (server.c)
#include<netinet/in.h>
#include<stdio.h>
#include<stdlib.h>
#include<sys/socket.h>
#include<sys/stat.h>
#include<sys/types.h>
#include<unistd.h>
int main(void) {
int create_socket, new_socket;
socklen_t addrlen;
int bufsize = 1024;
char *buffer = malloc(bufsize);
struct sockaddr_in address;
if ((create_socket = socket(AF_INET, SOCK_STREAM, 0)) > 0){
printf("The socket was created\n");
}
address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
address.sin_port = htons(80);
if (bind(create_socket, (struct sockaddr *) &address, sizeof(address)) == 0){
printf("Binding Socket\n");
}
long fsize;
FILE *fp = fopen("index.html", "r");
fseek(fp, 0, SEEK_END);
fsize = ftell(fp);
rewind(fp);
char *msg = malloc(fsize + 1);
fread(msg, sizeof(msg), 1, fp);
while (1) {
if (listen(create_socket, 10) < 0) {
perror("server: listen");
exit(1);
}
if ((new_socket = accept(create_socket, (struct sockaddr *) &address, &addrlen)) < 0) {
perror("server: accept");
exit(1);
}
if (new_socket > 0){
printf("The Client is connected...\n");
}
recv(new_socket, buffer, bufsize, 0);
printf("%s\n", buffer);
write(new_socket, "HTTP/1.1 200 OK\n", 16);
write(new_socket, "Content-length: 46\n", 19);
write(new_socket, "Content-Type: text/html\n\n", 25);
/* write(new_socket, "<html><body><H1>Hello world</H1></body></html>",46); */
if((send(new_socket, msg, fsize+1, 0)) > 0){
printf("success");
}
else{
printf("failed");
}
close(new_socket);
}
close(create_socket);
return 0;
}
// FILE （index.html）*相同目录
//FILE (index.html) *same directory
<html>
<body>
<h1>Hello World</h1>
</body>
</html>
推荐答案
代码完全因为十几种不同的原因而破碎了。请尝试更类似的内容：
The code is completely broken, for a dozen different reasons. Try something more like this instead:
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
bool writeDataToClient(int sckt, const void *data, int datalen)
{
const char *pdata = (const char*) data;
while (datalen > 0){
int numSent = send(sckt, pdata, datalen, 0);
if (numSent <= 0){
if (numSent == 0){
printf("The client was not written to: disconnected\n");
} else {
perror("The client was not written to");
}
return false;
}
pdata += numSent;
datalen -= numSent;
}
return true;
}
bool writeStrToClient(int sckt, const char *str)
{
return writeDataToClient(sckt, str, strlen(str));
}
int main(void){
int create_socket, new_socket;
char *buffer;
int bufsize = 1024;
struct sockaddr_in address;
socklen_t addrlen;
buffer = (char*) malloc(bufsize);
if (!buffer){
printf("The receive buffer was not allocated\n");
exit(1);
}
create_socket = socket(AF_INET, SOCK_STREAM, 0);
if (create_socket == -1){
perror("The socket was not created");
exit(1);
}
printf("The socket was created\n");
memset(&address, 0, sizeof(address));
address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
address.sin_port = htons(80);
if (bind(create_socket, (struct sockaddr *) &address, sizeof(address)) == -1){
perror("The socket was not bound");
exit(1);
}
printf("The socket is bound\n");
long fsize;
FILE *fp = fopen("index.html", "rb");
if (!fp){
perror("The file was not opened");
exit(1);
}
printf("The file was opened\n");
if (fseek(fp, 0, SEEK_END) == -1){
perror("The file was not seeked");
exit(1);
}
fsize = ftell(fp);
if (fsize == -1) {
perror("The file size was not retrieved");
exit(1);
}
rewind(fp);
char *msg = (char*) malloc(fsize);
if (!msg){
perror("The file buffer was not allocated\n");
exit(1);
}
if (fread(msg, fsize, 1, fp) != 1){
perror("The file was not read\n");
exit(1);
}
fclose(fp);
printf("The file size is %ld\n", fsize);
if (listen(create_socket, 10) == -1){
perror("The socket was not opened for listening");
exit(1);
}
printf("The socket is listening\n");
while (1) {
addrlen = sizeof(address);
new_socket = accept(create_socket, (struct sockaddr *) &address, &addrlen);
if (new_socket == -1) {
perror("A client was not accepted");
exit(1);
}
printf("A client is connected from %s:%hu...\n", inet_ntoa(address.sin_addr), ntohs(address.sin_port));
// I will leave it as an exercise for you to implement
// a proper HTTP request parser here...
int numRead = recv(new_socket, buffer, bufsize, 0);
if (numRead < 1){
if (numRead == 0){
printf("The client was not read from: disconnected\n");
} else {
perror("The client was not read from");
}
close(new_socket);
continue;
}
printf("%.*s\n", numRead, buffer);
if (!writeStrToClient(new_socket, "HTTP/1.1 200 OK\r\n")){
close(new_socket);
continue;
}
char clen[40];
sprintf(clen, "Content-length: %ld\r\n", fsize);
if (!writeStrToClient(new_socket, clen)){
close(new_socket);
continue;
}
if (!writeStrToClient(new_socket, "Content-Type: text/html\r\n")){
close(new_socket);
continue;
}
if (!writeStrToClient(new_socket, "Connection: close\r\n\r\n") == -1){
close(new_socket);
continue;
}
//if (!writeStrToClient(new_socket, "<html><body><H1>Hello world</H1></body></html>")){
if (!writeDataToClient(new_socket, msg, fsize)){
close(new_socket);
continue;
}
printf("The file was sent successfully\n");
close(new_socket);
}
close(create_socket);
return 0;
}
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