"Bad file number" under emulator.

Common bugs/problems with the Android SDK the Emulator and the ADT-Plugin.

"Bad file number" under emulator.

Postby kuri » Thu May 28, 2009 2:11 pm

Hello anyone!
im a real beginner with android (and phones in general, except linux and my nintendo ds, i never coded anything else), and im having an error saying "Bad file number" when executing my app.
My app is a socket client using SSL, coded in C.

Here is the code of the client made for android :
Code: Select all
/* ssl_client.c
*
* Copyright (c) 2000 Sean Walton and Macmillan Publishers.  Use may be in
* whole or in part in accordance to the General Public License (GPL).
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

/*****************************************************************************/
/*** ssl_client.c                                                          ***/
/***                                                                       ***/
/*** Demonstrate an SSL client.                                            ***/
/*****************************************************************************/

#include <stdio.h>
#include <unistd.h>
#include <malloc.h>
#include <string.h>
#include <sys/socket.h>
#include <linux/in.h>
#include <resolv.h>
#include <netdb.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <arpa/inet.h>

#define FAIL    -1

/*---------------------------------------------------------------------*/
/*--- OpenConnection - create socket and connect to server.         ---*/
/*---------------------------------------------------------------------*/
int OpenConnection(const char *hostname, int port)
{
   int sd;
   struct hostent *host;
   struct sockaddr_in addr;
   
   if ( (host = gethostbyname(hostname)) == NULL )
   {
      perror(hostname);
      abort();
   }
   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 = *(long*)(host->h_addr);
   if ( connect(sd, &addr, sizeof(addr)) != 0 )
   {
      close(sd);
      perror(hostname);
      abort();
   }
   return sd;
}

/*---------------------------------------------------------------------*/
/*--- InitCTX - initialize the SSL engine.                          ---*/
/*---------------------------------------------------------------------*/
SSL_CTX* InitCTX(void)

   SSL_METHOD *method;
   SSL_CTX *ctx;
   
   OpenSSL_add_all_algorithms();        /* Load cryptos, et.al. */
   SSL_load_error_strings();            /* Bring in and register error messages */
   method = TLSv1_client_method();        /* Create new client-method instance */
   ctx = SSL_CTX_new(method);            /* Create new context */
   if ( ctx == NULL )
   {
      ERR_print_errors_fp(stderr);
      abort();
   }
   return ctx;
}

/*---------------------------------------------------------------------*/
/*--- ShowCerts - print out the certificates.                       ---*/
/*---------------------------------------------------------------------*/
void ShowCerts(SSL* ssl)

   X509 *cert;
   char *line;
   
   cert = SSL_get_peer_certificate(ssl);    /* get the server's certificate */
   if ( cert != NULL )
   {
      printf("Server certificates:n");
      line = X509_NAME_oneline(X509_get_subject_name(cert), 0, 0);
      printf("Subject: %sn", line);
      free(line);                            /* free the malloc'ed string */
      line = X509_NAME_oneline(X509_get_issuer_name(cert), 0, 0);
      printf("Issuer: %sn", line);
      free(line);                            /* free the malloc'ed string */
      X509_free(cert);                    /* free the malloc'ed certificate copy */
   }
   else
     printf("No certificates.n");
}

/*---------------------------------------------------------------------*/
/*--- main - create SSL context and connect                         ---*/
/*---------------------------------------------------------------------*/
int main(int count, char *strings[])
{   
   SSL_CTX *ctx;
   int server;
   SSL *ssl;
   char buf[1024];
   int bytes;
   char *hostname, *portnum;
   
   if ( count != 3 )
   {
      printf("usage: %s <hostname> <portnum>n", strings[0]);
      exit(0);
   }
   
   hostname=strings[1];
   portnum=strings[2];
   SSL_library_init();
   ctx = InitCTX();
   server = OpenConnection(hostname, atoi(portnum));
   ssl = SSL_new(ctx);                        /* create new SSL connection state */
   SSL_set_fd(ssl, server);                /* attach the socket descriptor */
   if ( SSL_connect(ssl) == FAIL )            /* perform the connection */
     ERR_print_errors_fp(stderr);
   else
   { 
      char *msg = "Hello from Bryan";
     
      printf("Connected with %s encryptionn", SSL_get_cipher(ssl));
      ShowCerts(ssl);                                /* get any certs */
      SSL_write(ssl, msg, strlen(msg));            /* encrypt & send message */
      bytes = SSL_read(ssl, buf, sizeof(buf));    /* get reply & decrypt */
      buf[bytes] = 0;
      printf("Received: "%s"n", buf);
      SSL_free(ssl);                                /* release connection state */
   }
   close(server);                                    /* close socket */
   SSL_CTX_free(ctx);                                /* release context */
}


i compile it this way :
Code: Select all
arm-eabi-gcc -o ssl_client -I/home/kuri/Apps/android/system/core/include -I/home/kuri/Apps/android/hardware/libhardware/include -I/home/kuri/Apps/android/hardware/ril/include -I/home/kuri/Apps/android/dalvik/libnativehelper/include -I/home/kuri/Apps/android/frameworks/base/include -I/home/kuri/Apps/android/external/skia/include -I/home/kuri/Apps/android/out/target/product/generic/obj/include -I/home/kuri/Apps/android/bionic/libc/arch-arm/include -I/home/kuri/Apps/android/bionic/libc/include -I/home/kuri/Apps/android/bionic/libstdc++/include -I/home/kuri/Apps/android/bionic/libc/kernel/common -I/home/kuri/Apps/android/bionic/libc/kernel/arch-arm -I/home/kuri/Apps/android/bionic/libm/include -I/home/kuri/Apps/android/bionic/libm/include/arch/arm -I/home/kuri/Apps/android/bionic/libthread_db/include -I/home/kuri/Apps/android/bionic/libm/arm -I/home/kuri/Apps/android/bionic/libm -I/home/kuri/Apps/android/external/openssl/include -I/home/kuri/Apps/android/out/target/product/generic/obj/SHARED_LIBRARIES/libm_intermediates -D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ -DANDROID -DSK_RELEASE -DNDEBUG -include /home/kuri/Apps/android/system/core/include/arch/linux-arm/AndroidConfig.h -UDEBUG -march=armv5te -mtune=xscale -msoft-float -mthumb-interwork -fpic -fno-exceptions -ffunction-sections -funwind-tables -fstack-protector -fmessage-length=0 -Bdynamic -Wl,-T,/home/kuri/Apps/android/build/core/armelf.x -Wl,-dynamic-linker,/system/bin/linker -Wl,--gc-sections -Wl,-z,nocopyreloc -Wl,--no-undefined -Wl,-rpath-link=/home/kuri/Apps/android/out/target/product/generic/obj/lib -L/home/kuri/Apps/android/out/target/product/generic/obj/lib -nostdlib /home/kuri/Apps/android/out/target/product/generic/obj/lib/crtend_android.o /home/kuri/Apps/android/out/target/product/generic/obj/lib/crtbegin_dynamic.o /home/kuri/Apps/android/out/target/product/generic/obj/lib/libssl.so /home/kuri/Apps/android/prebuilt/linux-x86/toolchain/arm-eabi-4.3.1/lib/gcc/arm-eabi/4.3.1/libgcc.a -lc -lm client.c


if i do :
kuri[@]Jetdail(14:33:51)[~/Work/Android/C/SSL_Client_Demo]
$ adb shell
# cd /data/local
# ls
ssl_client
tmp
test
# chmod 755 ssl_client
# ./ssl_client 192.168.2.89 12345
Connected with AES256-SHA encryption
Server certificates:
Subject: /C=FR/ST=xxxx/L=xxxxt/O=xxxx/CN=None/emailAddress=xxxx@xxxx.com
Issuer: /C=FR/ST=xxxx/L=xxxx/O=xxxx/CN=None/emailAddress=xxxx@xxxx.com
Received: "Hello Bryan"


If i do the same using the emulator (menu/devtools/terminal)
i cant chmod (permission denied), i cant ls /data/local (denied too), and executing ssl_client gives me "Bad file number".

here is the code of the ssl server, so you can test it :
Code: Select all
/* ssl_server.c
*  *
*  * Copyright (c) 2000 Sean Walton and Macmillan Publishers.  Use may be in
*  * whole or in part in accordance to the General Public License (GPL).
*  *
*  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS `AS IS'' AND
*  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
*  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
*  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
*  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
*  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
*  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
*  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
*  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
*  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
*  * SUCH DAMAGE.
* */

/*****************************************************************************/
/*** ssl_server.c                                                          ***/
/***                                                                       ***/
/*** Demonstrate an SSL server.                                            ***/
/*****************************************************************************/

#include <stdio.h>
#include <unistd.h>
#include <malloc.h>
#include <string.h>
#include <sys/socket.h>
#include <resolv.h>
#include <openssl/ssl.h>
#include <openssl/err.h>

#define FAIL    -1

/*---------------------------------------------------------------------*/
/*--- OpenListener - create server socket                           ---*/
/*---------------------------------------------------------------------*/
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, &addr, sizeof(addr)) != 0 )
   {
      perror("can't bind port");
      abort();
   }
   
   if ( listen(sd, 10) != 0 )
   {
      perror("Can't configure listening port");
      abort();
   }
   
   return sd;
}


/*---------------------------------------------------------------------*/
/*--- InitServerCTX - initialize SSL server  and create context     ---*/
/*---------------------------------------------------------------------*/
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 = TLSv1_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;
}


/*---------------------------------------------------------------------*/
/*--- LoadCertificates - load from files.                           ---*/
/*---------------------------------------------------------------------*/
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 certificaten");
      abort();
   }
   
}


/*---------------------------------------------------------------------*/
/*--- ShowCerts - print out certificates.                           ---*/
/*---------------------------------------------------------------------*/
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: %sn", line);
      free(line);
      line = X509_NAME_oneline(X509_get_issuer_name(cert), 0, 0);
      printf("Issuer: %sn", line);
      free(line);
      X509_free(cert);
   }
   
   else
     printf("No certificates.n");
}


/*---------------------------------------------------------------------*/
/*--- Servlet - SSL servlet (contexts can be shared)                ---*/
/*---------------------------------------------------------------------*/
void Servlet(SSL* ssl)/* Serve the connection -- threadable */
{
   char buf[1024];
   char reply[1024];
   int sd, bytes;
   const char* answer="Hello %s";
   char name[512];
   
   memset(name, 0, sizeof(name));   
   
   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);
         sscanf(buf, "%*s %*s %s", name);
         sprintf(reply, answer, name);/* 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 - create SSL socket server.                              ---*/
/*---------------------------------------------------------------------*/
int main(int argc, char **argv)
{
   SSL_CTX *ctx;
   int server;
   char *portnum;
   
   if ( argc != 2 )
   {
      printf("Usage: %s <portnum>n", argv[0]);
      exit(0);
   }
   
   portnum = argv[1];
       
   SSL_library_init();
   ctx = InitServerCTX();/* initialize SSL */
   LoadCertificates(ctx, "mycert.pem", "mykey.pem");/* load certs */
   server = OpenListener(atoi(portnum));/* create server socket */
   while (1)
   {
      struct sockaddr_in addr;
      int len = sizeof(addr);
      SSL *ssl;
     
      int client = accept(server, &addr, &len);/* accept connection as usual */
      printf("Connection: %s:%dn",
         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 */
   }
   
   close(server);/* close server socket */
   SSL_CTX_free(ctx);/* release context */
}


so if anyone can explain me why i dont have rights (am i not root ?), and why saying "bad file number" (normally it happens if my file descriptor is wrong, which isnt in this case)
kuri
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Postby kuri » Thu May 28, 2009 2:36 pm

ok so the problem is
Code: Select all
   sd = socket(PF_INET, SOCK_STREAM, 0);

that returns -1, errno contains 13 which is (from asm_generic/errno_base.h):
#define EACCES 13 /* Permission denied */


so, how to get the rights ?
kuri
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Posts: 2
Joined: Thu May 28, 2009 1:55 pm

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