📄 web_server.c.bak
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#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <errno.h>
unsigned short port = 8008; // Default server port number
#define DEBUG 1
char * error_return = "<HTML>\n<BODY>File not found\n</BODY>\n</HTML>";
char ret_buf[32768];
char * read_file(char * buf ) {
int i;
char *cp, *cp2;
FILE *f;
// string like "GET /index.html HTTP/1.1\n"
cp = buf + 5;
cp2 = strstr(cp, " HTTP");
if (cp2 != NULL) *cp2 = '\0';
// if "GET / HTTP/1.1\n"
if ( *cp == '\0') strcpy( cp, "index.html");
if (DEBUG) printf("file: %s\n", cp);
f = fopen(cp, "r");
if (f == NULL) return error_return;
i = fread(ret_buf, 1, 32768, f);
if (DEBUG) printf("%d bytes read from file %s\n", i, cp);
if (i == 0) { fclose(f); return error_return; }
ret_buf[i] = '\0';
fclose(f);
return ret_buf;
}
int main(int argc, char* argv[]) {
int i, sock;
char* recvBuffer = (char *)malloc(4001);
int rc = 0;
int serverSocket;
struct sockaddr_in serverAddr;
struct sockaddr_in clientAddr;
int clientAddrSize;
int size;
int totalSent;
int bytesSent;
char * cbuf;
serverSocket = socket(AF_INET, SOCK_STREAM, 0);
if (serverSocket == -1) {
printf("Invalid socket\n");
exit(1);
}
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(port);
serverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
memset(&(serverAddr.sin_zero), 0, 8);
printf("Binding server socket to port %d\n", port);
rc = bind(serverSocket, (struct sockaddr*) &serverAddr,
sizeof(struct sockaddr));
if (rc == -1) {
printf("Bad bind\n");
exit(1);
}
rc = listen(serverSocket, 10); // allow 10 queued requests
if (rc == -1) {
printf("Bad listen\n");
exit(1);
}
printf("Accepting connections ...\n");
while (1) {
clientAddrSize = sizeof(struct sockaddr_in);
do
sock = accept(serverSocket,
(struct sockaddr*) &clientAddr,
&clientAddrSize);
while ((sock == -1) && (errno == EINTR));
if (sock == -1) {
printf("Bad accept\n");
exit(1);
}
if (DEBUG) printf("Connection from %s\n",
inet_ntoa((struct in_addr) clientAddr.sin_addr));
i = recv(sock, recvBuffer, 4000, 0);
if (i == -1) break;
if (recvBuffer[i - 1] != '\n') break;
recvBuffer[i] = '\0';
if (DEBUG) {
printf("Received from client: %s\n", recvBuffer);
}
// call a separate work function to process request:
cbuf = read_file(recvBuffer);
size = strlen(cbuf);
totalSent = 0;
do {
bytesSent = send(sock, cbuf + totalSent,
strlen(cbuf + totalSent), 0);
if (bytesSent == -1) break;
totalSent += bytesSent;
} while (totalSent < size);
if (DEBUG) printf("Connection closed by client.\n");
close(sock);
}
return 0;
}
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