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webserver.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <resolv.h>
#include "openssl/ssl.h"
#include "openssl/err.h"
#define PORT 443
#define LISTENQ 23 // Cola de espera para los clientes
#define BUFFERSIZE 8096
#define FAIL -1
int OpenListener(int port)
{ int sd;
struct sockaddr_in addr;
sd = socket(PF_INET, SOCK_STREAM, 0);
bzero(&addr, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = INADDR_ANY;
if ( bind(sd, (struct sockaddr*)&addr, sizeof(addr)) != 0 )
{
perror("can't bind port");
abort();
}
if ( listen(sd, 10) != 0 )
{
perror("Can't configure listening port");
abort();
}
return sd;
}
SSL_CTX* InitServerCTX(void)
{ SSL_METHOD *method;
SSL_CTX *ctx;
OpenSSL_add_all_algorithms(); /* load & register all cryptos, etc. */
SSL_load_error_strings(); /* load all error messages */
method = SSLv23_server_method(); /* create new server-method instance */
ctx = SSL_CTX_new(method); /* create new context from method */
if ( ctx == NULL )
{
ERR_print_errors_fp(stderr);
abort();
}
return ctx;
}
void LoadCertificates(SSL_CTX* ctx, char* CertFile, char* KeyFile)
{
/* set the local certificate from CertFile */
if ( SSL_CTX_use_certificate_file(ctx, CertFile, SSL_FILETYPE_PEM) <= 0 )
{
ERR_print_errors_fp(stderr);
abort();
}
/* set the private key from KeyFile (may be the same as CertFile) */
if ( SSL_CTX_use_PrivateKey_file(ctx, KeyFile, SSL_FILETYPE_PEM) <= 0 )
{
ERR_print_errors_fp(stderr);
abort();
}
/* verify private key */
if ( !SSL_CTX_check_private_key(ctx) )
{
fprintf(stderr, "Private key does not match the public certificate\n");
abort();
}
}
void ShowCerts(SSL* ssl)
{ X509 *cert;
char *line;
cert = SSL_get_peer_certificate(ssl); /* Get certificates (if available) */
if ( cert != NULL )
{
printf("Server certificates:\n");
line = X509_NAME_oneline(X509_get_subject_name(cert), 0, 0);
printf("Subject: %s\n", line);
free(line);
line = X509_NAME_oneline(X509_get_issuer_name(cert), 0, 0);
printf("Issuer: %s\n", line);
free(line);
X509_free(cert);
}
else
printf("No certificates.\n");
}
void Servlet(SSL* ssl) /* Serve the connection -- threadable */
{ char buf[1024];
char reply[1024];
int sd, bytes;
const char* HTMLecho="<html><body><pre>%s</pre></body></html>\n\n";
if ( SSL_accept(ssl) == FAIL ) /* do SSL-protocol accept */
ERR_print_errors_fp(stderr);
else
{
ShowCerts(ssl); /* get any certificates */
bytes = SSL_read(ssl, buf, sizeof(buf)); /* get request */
if ( bytes > 0 )
{
buf[bytes] = 0;
printf("Client msg: \"%s\"\n", buf);
sprintf(reply, HTMLecho, buf); /* construct reply */
SSL_write(ssl, reply, strlen(reply)); /* send reply */
}
else
ERR_print_errors_fp(stderr);
}
sd = SSL_get_fd(ssl); /* get socket connection */
SSL_free(ssl); /* release SSL state */
close(sd); /* close connection */
}
/*main*/
void web (int);
int main (int count, char *strings[])
{
int listenfd, socketfd, pid;
socklen_t length;
static struct sockaddr_in serv_addr;
static struct sockaddr_in cli_addr;
SSL_CTX *ctx;
int server;
char *portnum;
if ( count != 2 )
{
printf("Usage: %s <portnum>\n", strings[0]);
exit(0);
}
// Se crea el socket de escuaha
listenfd = socket (AF_INET, SOCK_STREAM, 0);
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htonl (INADDR_ANY);
serv_addr.sin_port = htons (PORT);
// Se asociamos la direccion con el socket
bind (listenfd, (struct sockaddr *) &serv_addr, sizeof (serv_addr));
listen (listenfd, LISTENQ);
//aaaa
SSL_library_init();
portnum = strings[1];
ctx = InitServerCTX(); /* initialize SSL */
LoadCertificates(ctx, "cert.pem", "key.pem"); /* load certs */
server = OpenListener(atoi(portnum)); /* create server socket */
while (1)
{ struct sockaddr_in addr;
socklen_t len = sizeof(addr);
SSL *ssl;
int client = accept(server, (struct sockaddr*)&addr, &len); /* accept connection as usual */
printf("Connection: %s:%d\n",inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
ssl = SSL_new(ctx); /* get new SSL state with context */
SSL_set_fd(ssl, client); /* set connection socket to SSL state */
Servlet(ssl); /* service connection */
for (; ;) {
length = sizeof (cli_addr);
//socketfd = accept (listenfd, (struct sockaddr *) &cli_addr, &length);
socketfd = accept (listenfd, (struct sockaddr *) &cli_addr, &length);
if ((pid = fork ()) == 0) {
close (listenfd);
web (socketfd);
} else {
close (socketfd);
}
}
}
close(server); /* close server socket */
SSL_CTX_free(ctx); /* release context */
}
void
web (int fd)
{
int i, file_fd;
long ret, size;
static char buffer[BUFFERSIZE+1];
struct stat st;
char * ext;
ret = read (fd, buffer, BUFFERSIZE);
// Si leemos un numero de bytes menor al tamano del buffer, pongo el caracter de terminacion
if (ret > 0 && ret < BUFFERSIZE) {
buffer[ret] = 0;
} else {
buffer[0] = 0;
}
// verifico que el navegador nos envia la instruccion GET
if (strncmp (buffer, "GET ", 4) == 0) {
for (i = 4; i < BUFFERSIZE; i++) {
if (buffer[i] == ' ') {
buffer[i] = 0;
break;
}
}
// Verifico que el usuario especifico una pagina, si no lo mando al index
if (!strncmp (&buffer[0], "GET /\0", 6)) {
strcpy (buffer, "GET /index.html");
}
// Se abre el archivo, si no existe se abre el de error
if ((file_fd = open (&buffer[5], O_RDONLY)) == -1) {
file_fd = open ("404.html", O_RDONLY);
fstat (file_fd, &st);
size = st.st_size;
sprintf (buffer, "HTTP/1.0 404 Not Found\r\nContent-Type: text/html\r\nContent-Lenhttp://localhost/test.htmlhttp://localhost/test.htmlgth: %ld\r\n\r\n",size);
} else { // Si el archivo existe se muestra el contenido
fstat (file_fd, &st);
size = st.st_size;
ext = strstr(buffer,".");
ext = ext+1;
fprintf(stderr,"%s",ext);
if(strcmp("html",ext)==0){
sprintf (buffer, "HTTP/1.1 200 OK\r\nContent-Type: text/html \r\nContent-Length: %ld\r\n\r\n", size);
} else if(strcmp("jpg",ext)==0){
sprintf (buffer, "HTTP/1.1 200 OK\r\nContent-Type: image/jpeg \r\nContent-Length: %ld\r\n\r\n", size);
} else if (strcmp("txt",ext)==0){
sprintf (buffer, "HTTP/1.1 200 OK\r\nContent-Type: text/plain \r\nContent-Length: %ld\r\n\r\n", size);
} else{
sprintf (buffer, "HTTP/1.1 200 OK\r\nContent-Type: unknown/unknown \r\nContent-Length: %ld\r\n\r\n", size);
}
}
write (fd, buffer, strlen (buffer));
// Obtenemos el archivo completo para poder cerrar el socket
while ((ret = read (file_fd, buffer, BUFFERSIZE)) > 0 ) {
write (fd, buffer, ret);
}
}
sleep (1);
exit (1);
}