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glibc  2.9
Classes | Functions | Variables
clnt_udp.c File Reference
#include <stdio.h>
#include <unistd.h>
#include <libintl.h>
#include <rpc/rpc.h>
#include <rpc/xdr.h>
#include <rpc/clnt.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netdb.h>
#include <errno.h>
#include <rpc/pmap_clnt.h>
#include <net/if.h>
#include <ifaddrs.h>
#include <fcntl.h>
#include <kernel-features.h>

Go to the source code of this file.

Classes

struct  cu_data

Functions

bool_t xdr_opaque_auth (XDR *, struct opaque_auth *)
u_long _create_xid (void)
static enum clnt_stat clntudp_call (CLIENT *, u_long, xdrproc_t, caddr_t, xdrproc_t, caddr_t, struct timeval)
static void clntudp_abort (void)
static void clntudp_geterr (CLIENT *, struct rpc_err *)
static bool_t clntudp_freeres (CLIENT *, xdrproc_t, caddr_t)
static bool_t clntudp_control (CLIENT *, int, char *)
static void clntudp_destroy (CLIENT *)
CLIENT__libc_clntudp_bufcreate (struct sockaddr_in *raddr, u_long program, u_long version, struct timeval wait, int *sockp, u_int sendsz, u_int recvsz, int flags)
CLIENTclntudp_bufcreate (struct sockaddr_in *raddr, u_long program, u_long version, struct timeval wait, int *sockp, u_int sendsz, u_int recvsz)
CLIENTclntudp_create (struct sockaddr_in *raddr, u_long program, u_long version, struct timeval wait, int *sockp)
static int is_network_up (int sock)

Variables

static struct clnt_ops

Class Documentation

struct cu_data

Definition at line 32 of file nis_findserv.c.

Class Members
bool_t cu_closeit
char cu_inbuf
char * cu_outbuf
XDR cu_outxdrs
u_int cu_recvsz
int cu_rlen
u_int cu_sendsz
int cu_sock
u_int cu_xdrpos

Function Documentation

CLIENT* __libc_clntudp_bufcreate ( struct sockaddr_in raddr,
u_long  program,
u_long  version,
struct timeval  wait,
int sockp,
u_int  sendsz,
u_int  recvsz,
int  flags 
)

Definition at line 127 of file clnt_udp.c.

{
  CLIENT *cl;
  struct cu_data *cu = NULL;
  struct rpc_msg call_msg;

  cl = (CLIENT *) mem_alloc (sizeof (CLIENT));
  sendsz = ((sendsz + 3) / 4) * 4;
  recvsz = ((recvsz + 3) / 4) * 4;
  cu = (struct cu_data *) mem_alloc (sizeof (*cu) + sendsz + recvsz);
  if (cl == NULL || cu == NULL)
    {
      struct rpc_createerr *ce = &get_rpc_createerr ();
      (void) __fxprintf (NULL, "%s: %s",
                      "clntudp_create", _("out of memory\n"));
      ce->cf_stat = RPC_SYSTEMERROR;
      ce->cf_error.re_errno = ENOMEM;
      goto fooy;
    }
  cu->cu_outbuf = &cu->cu_inbuf[recvsz];

  if (raddr->sin_port == 0)
    {
      u_short port;
      if ((port =
          pmap_getport (raddr, program, version, IPPROTO_UDP)) == 0)
       {
         goto fooy;
       }
      raddr->sin_port = htons (port);
    }
  cl->cl_ops = (struct clnt_ops *) &udp_ops;
  cl->cl_private = (caddr_t) cu;
  cu->cu_raddr = *raddr;
  cu->cu_rlen = sizeof (cu->cu_raddr);
  cu->cu_wait = wait;
  cu->cu_total.tv_sec = -1;
  cu->cu_total.tv_usec = -1;
  cu->cu_sendsz = sendsz;
  cu->cu_recvsz = recvsz;
  call_msg.rm_xid = _create_xid ();
  call_msg.rm_direction = CALL;
  call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
  call_msg.rm_call.cb_prog = program;
  call_msg.rm_call.cb_vers = version;
  INTUSE(xdrmem_create) (&(cu->cu_outxdrs), cu->cu_outbuf, sendsz, XDR_ENCODE);
  if (!INTUSE(xdr_callhdr) (&(cu->cu_outxdrs), &call_msg))
    {
      goto fooy;
    }
  cu->cu_xdrpos = XDR_GETPOS (&(cu->cu_outxdrs));
  if (*sockp < 0)
    {
      int dontblock = 1;

#ifdef SOCK_NONBLOCK
# ifndef __ASSUME_SOCK_CLOEXEC
      if (__have_sock_cloexec >= 0)
# endif
       {
         *sockp = __socket (AF_INET, SOCK_DGRAM|SOCK_NONBLOCK|flags,
                          IPPROTO_UDP);
# ifndef __ASSUME_SOCK_CLOEXEC
         if (__have_sock_cloexec == 0)
           __have_sock_cloexec = *sockp >= 0 || errno != EINVAL ? 1 : -1;
# endif
       }
#endif
#ifndef __ASSUME_SOCK_CLOEXEC
# ifdef SOCK_CLOEXEC
      if (__have_sock_cloexec < 0)
# endif
       {
         *sockp = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
# ifdef SOCK_CLOEXEC
         if (flags & SOCK_CLOEXEC)
           __fcntl (*sockp, F_SETFD, FD_CLOEXEC);
# endif
       }
#endif
      if (__builtin_expect (*sockp < 0, 0))
       {
         struct rpc_createerr *ce = &get_rpc_createerr ();
         ce->cf_stat = RPC_SYSTEMERROR;
         ce->cf_error.re_errno = errno;
         goto fooy;
       }
      /* attempt to bind to prov port */
      (void) bindresvport (*sockp, (struct sockaddr_in *) 0);
#ifndef __ASSUME_SOCK_CLOEXEC
# ifdef SOCK_CLOEXEC
      if (__have_sock_cloexec < 0)
# endif
       /* the sockets rpc controls are non-blocking */
       (void) __ioctl (*sockp, FIONBIO, (char *) &dontblock);
#endif
#ifdef IP_RECVERR
      {
       int on = 1;
       __setsockopt (*sockp, SOL_IP, IP_RECVERR, &on, sizeof(on));
      }
#endif
      cu->cu_closeit = TRUE;
    }
  else
    {
      cu->cu_closeit = FALSE;
    }
  cu->cu_sock = *sockp;
  cl->cl_auth = INTUSE(authnone_create) ();
  return cl;
fooy:
  if (cu)
    mem_free ((caddr_t) cu, sizeof (*cu) + sendsz + recvsz);
  if (cl)
    mem_free ((caddr_t) cl, sizeof (CLIENT));
  return (CLIENT *) NULL;
}

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u_long _create_xid ( void  )
static void clntudp_abort ( void  ) [static]

Definition at line 544 of file clnt_udp.c.

{
}
CLIENT* clntudp_bufcreate ( struct sockaddr_in raddr,
u_long  program,
u_long  version,
struct timeval  wait,
int sockp,
u_int  sendsz,
u_int  recvsz 
)

Definition at line 250 of file clnt_udp.c.

{
  return INTUSE(__libc_clntudp_bufcreate) (raddr, program, version, wait,
                                      sockp, sendsz, recvsz, 0);
}

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static enum clnt_stat clntudp_call ( CLIENT cl,
u_long  proc,
xdrproc_t  xargs,
caddr_t  argsp,
xdrproc_t  xresults,
caddr_t  resultsp,
struct timeval  utimeout 
) [static]

Definition at line 297 of file clnt_udp.c.

{
  struct cu_data *cu = (struct cu_data *) cl->cl_private;
  XDR *xdrs;
  int outlen = 0;
  int inlen;
  socklen_t fromlen;
  struct pollfd fd;
  int milliseconds = (cu->cu_wait.tv_sec * 1000) +
    (cu->cu_wait.tv_usec / 1000);
  struct sockaddr_in from;
  struct rpc_msg reply_msg;
  XDR reply_xdrs;
  struct timeval time_waited;
  bool_t ok;
  int nrefreshes = 2;              /* number of times to refresh cred */
  struct timeval timeout;
  int anyup;                /* any network interface up */

  if (cu->cu_total.tv_usec == -1)
    {
      timeout = utimeout;   /* use supplied timeout */
    }
  else
    {
      timeout = cu->cu_total;      /* use default timeout */
    }

  time_waited.tv_sec = 0;
  time_waited.tv_usec = 0;
call_again:
  xdrs = &(cu->cu_outxdrs);
  if (xargs == NULL)
    goto get_reply;
  xdrs->x_op = XDR_ENCODE;
  XDR_SETPOS (xdrs, cu->cu_xdrpos);
  /*
   * the transaction is the first thing in the out buffer
   */
  (*(uint32_t *) (cu->cu_outbuf))++;
  if ((!XDR_PUTLONG (xdrs, (long *) &proc)) ||
      (!AUTH_MARSHALL (cl->cl_auth, xdrs)) ||
      (!(*xargs) (xdrs, argsp)))
    return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
  outlen = (int) XDR_GETPOS (xdrs);

send_again:
  if (__sendto (cu->cu_sock, cu->cu_outbuf, outlen, 0,
              (struct sockaddr *) &(cu->cu_raddr), cu->cu_rlen)
      != outlen)
    {
      cu->cu_error.re_errno = errno;
      return (cu->cu_error.re_status = RPC_CANTSEND);
    }

  /*
   * Hack to provide rpc-based message passing
   */
  if (timeout.tv_sec == 0 && timeout.tv_usec == 0)
    {
      return (cu->cu_error.re_status = RPC_TIMEDOUT);
    }
 get_reply:
  /*
   * sub-optimal code appears here because we have
   * some clock time to spare while the packets are in flight.
   * (We assume that this is actually only executed once.)
   */
  reply_msg.acpted_rply.ar_verf = _null_auth;
  reply_msg.acpted_rply.ar_results.where = resultsp;
  reply_msg.acpted_rply.ar_results.proc = xresults;
  fd.fd = cu->cu_sock;
  fd.events = POLLIN;
  anyup = 0;
  for (;;)
    {
      switch (__poll (&fd, 1, milliseconds))
       {

       case 0:
         if (anyup == 0)
           {
             anyup = is_network_up (cu->cu_sock);
             if (!anyup)
              return (cu->cu_error.re_status = RPC_CANTRECV);
           }

         time_waited.tv_sec += cu->cu_wait.tv_sec;
         time_waited.tv_usec += cu->cu_wait.tv_usec;
         while (time_waited.tv_usec >= 1000000)
           {
             time_waited.tv_sec++;
             time_waited.tv_usec -= 1000000;
           }
         if ((time_waited.tv_sec < timeout.tv_sec) ||
             ((time_waited.tv_sec == timeout.tv_sec) &&
              (time_waited.tv_usec < timeout.tv_usec)))
           goto send_again;
         return (cu->cu_error.re_status = RPC_TIMEDOUT);

         /*
          * buggy in other cases because time_waited is not being
          * updated.
          */
       case -1:
         if (errno == EINTR)
           continue;
         cu->cu_error.re_errno = errno;
         return (cu->cu_error.re_status = RPC_CANTRECV);
       }
#ifdef IP_RECVERR
      if (fd.revents & POLLERR)
       {
         struct msghdr msg;
         struct cmsghdr *cmsg;
         struct sock_extended_err *e;
         struct sockaddr_in err_addr;
         struct iovec iov;
         char *cbuf = (char *) alloca (outlen + 256);
         int ret;

         iov.iov_base = cbuf + 256;
         iov.iov_len = outlen;
         msg.msg_name = (void *) &err_addr;
         msg.msg_namelen = sizeof (err_addr);
         msg.msg_iov = &iov;
         msg.msg_iovlen = 1;
         msg.msg_flags = 0;
         msg.msg_control = cbuf;
         msg.msg_controllen = 256;
         ret = __recvmsg (cu->cu_sock, &msg, MSG_ERRQUEUE);
         if (ret >= 0
             && memcmp (cbuf + 256, cu->cu_outbuf, ret) == 0
             && (msg.msg_flags & MSG_ERRQUEUE)
             && ((msg.msg_namelen == 0
                 && ret >= 12)
                || (msg.msg_namelen == sizeof (err_addr)
                    && err_addr.sin_family == AF_INET
                    && memcmp (&err_addr.sin_addr, &cu->cu_raddr.sin_addr,
                             sizeof (err_addr.sin_addr)) == 0
                    && err_addr.sin_port == cu->cu_raddr.sin_port)))
           for (cmsg = CMSG_FIRSTHDR (&msg); cmsg;
               cmsg = CMSG_NXTHDR (&msg, cmsg))
             if (cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_RECVERR)
              {
                e = (struct sock_extended_err *) CMSG_DATA(cmsg);
                cu->cu_error.re_errno = e->ee_errno;
                return (cu->cu_error.re_status = RPC_CANTRECV);
              }
       }
#endif
      do
       {
         fromlen = sizeof (struct sockaddr);
         inlen = __recvfrom (cu->cu_sock, cu->cu_inbuf,
                           (int) cu->cu_recvsz, MSG_DONTWAIT,
                           (struct sockaddr *) &from, &fromlen);
       }
      while (inlen < 0 && errno == EINTR);
      if (inlen < 0)
       {
         if (errno == EWOULDBLOCK)
           continue;
         cu->cu_error.re_errno = errno;
         return (cu->cu_error.re_status = RPC_CANTRECV);
       }
      if (inlen < 4)
       continue;

      /* see if reply transaction id matches sent id.
        Don't do this if we only wait for a replay */
      if (xargs != NULL
         && (*((u_int32_t *) (cu->cu_inbuf))
             != *((u_int32_t *) (cu->cu_outbuf))))
       continue;
      /* we now assume we have the proper reply */
      break;
    }

  /*
   * now decode and validate the response
   */
  INTUSE(xdrmem_create) (&reply_xdrs, cu->cu_inbuf, (u_int) inlen, XDR_DECODE);
  ok = INTUSE(xdr_replymsg) (&reply_xdrs, &reply_msg);
  /* XDR_DESTROY(&reply_xdrs);  save a few cycles on noop destroy */
  if (ok)
    {
      _seterr_reply (&reply_msg, &(cu->cu_error));
      if (cu->cu_error.re_status == RPC_SUCCESS)
       {
         if (!AUTH_VALIDATE (cl->cl_auth,
                           &reply_msg.acpted_rply.ar_verf))
           {
             cu->cu_error.re_status = RPC_AUTHERROR;
             cu->cu_error.re_why = AUTH_INVALIDRESP;
           }
         if (reply_msg.acpted_rply.ar_verf.oa_base != NULL)
           {
             xdrs->x_op = XDR_FREE;
             (void) INTUSE(xdr_opaque_auth) (xdrs,
                                         &(reply_msg.acpted_rply.ar_verf));
           }
       }                    /* end successful completion */
      else
       {
         /* maybe our credentials need to be refreshed ... */
         if (nrefreshes > 0 && AUTH_REFRESH (cl->cl_auth))
           {
             nrefreshes--;
             goto call_again;
           }
       }                    /* end of unsuccessful completion */
    }                       /* end of valid reply message */
  else
    {
      cu->cu_error.re_status = RPC_CANTDECODERES;
    }
  return cu->cu_error.re_status;
}

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static bool_t clntudp_control ( CLIENT cl,
int  request,
char *  info 
) [static]

Definition at line 549 of file clnt_udp.c.

{
  struct cu_data *cu = (struct cu_data *) cl->cl_private;

  switch (request)
    {
    case CLSET_FD_CLOSE:
      cu->cu_closeit = TRUE;
      break;
    case CLSET_FD_NCLOSE:
      cu->cu_closeit = FALSE;
      break;
    case CLSET_TIMEOUT:
      cu->cu_total = *(struct timeval *) info;
      break;
    case CLGET_TIMEOUT:
      *(struct timeval *) info = cu->cu_total;
      break;
    case CLSET_RETRY_TIMEOUT:
      cu->cu_wait = *(struct timeval *) info;
      break;
    case CLGET_RETRY_TIMEOUT:
      *(struct timeval *) info = cu->cu_wait;
      break;
    case CLGET_SERVER_ADDR:
      *(struct sockaddr_in *) info = cu->cu_raddr;
      break;
    case CLGET_FD:
      *(int *)info = cu->cu_sock;
      break;
    case CLGET_XID:
      /*
       * use the knowledge that xid is the
       * first element in the call structure *.
       * This will get the xid of the PREVIOUS call
       */
      *(u_long *)info = ntohl(*(u_long *)cu->cu_outbuf);
      break;
    case CLSET_XID:
      /* This will set the xid of the NEXT call */
      *(u_long *)cu->cu_outbuf =  htonl(*(u_long *)info - 1);
      /* decrement by 1 as clntudp_call() increments once */
    case CLGET_VERS:
      /*
       * This RELIES on the information that, in the call body,
       * the version number field is the fifth field from the
       * begining of the RPC header. MUST be changed if the
       * call_struct is changed
       */
      *(u_long *)info = ntohl(*(u_long *)(cu->cu_outbuf +
                                     4 * BYTES_PER_XDR_UNIT));
      break;
    case CLSET_VERS:
      *(u_long *)(cu->cu_outbuf + 4 * BYTES_PER_XDR_UNIT)
       = htonl(*(u_long *)info);
      break;
    case CLGET_PROG:
      /*
       * This RELIES on the information that, in the call body,
       * the program number field is the  field from the
       * begining of the RPC header. MUST be changed if the
       * call_struct is changed
       */
      *(u_long *)info = ntohl(*(u_long *)(cu->cu_outbuf +
                                     3 * BYTES_PER_XDR_UNIT));
      break;
    case CLSET_PROG:
      *(u_long *)(cu->cu_outbuf + 3 * BYTES_PER_XDR_UNIT)
       = htonl(*(u_long *)info);
      break;
    /* The following are only possible with TI-RPC */
    case CLGET_SVC_ADDR:
    case CLSET_SVC_ADDR:
    case CLSET_PUSH_TIMOD:
    case CLSET_POP_TIMOD:
    default:
      return FALSE;
    }
  return TRUE;
}

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CLIENT* clntudp_create ( struct sockaddr_in raddr,
u_long  program,
u_long  version,
struct timeval  wait,
int sockp 
)

Definition at line 260 of file clnt_udp.c.

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static void clntudp_destroy ( CLIENT cl) [static]

Definition at line 631 of file clnt_udp.c.

{
  struct cu_data *cu = (struct cu_data *) cl->cl_private;

  if (cu->cu_closeit)
    {
      (void) __close (cu->cu_sock);
    }
  XDR_DESTROY (&(cu->cu_outxdrs));
  mem_free ((caddr_t) cu, (sizeof (*cu) + cu->cu_sendsz + cu->cu_recvsz));
  mem_free ((caddr_t) cl, sizeof (CLIENT));
}

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static bool_t clntudp_freeres ( CLIENT cl,
xdrproc_t  xdr_res,
caddr_t  res_ptr 
) [static]

Definition at line 534 of file clnt_udp.c.

{
  struct cu_data *cu = (struct cu_data *) cl->cl_private;
  XDR *xdrs = &(cu->cu_outxdrs);

  xdrs->x_op = XDR_FREE;
  return (*xdr_res) (xdrs, res_ptr);
}
static void clntudp_geterr ( CLIENT cl,
struct rpc_err errp 
) [static]

Definition at line 525 of file clnt_udp.c.

{
  struct cu_data *cu = (struct cu_data *) cl->cl_private;

  *errp = cu->cu_error;
}
static int is_network_up ( int  sock) [static]

Definition at line 273 of file clnt_udp.c.

{
  struct ifaddrs *ifa;

  if (getifaddrs (&ifa) != 0)
    return 0;

  struct ifaddrs *run = ifa;
  while (run != NULL)
    {
      if ((run->ifa_flags & IFF_UP) != 0
         && run->ifa_addr != NULL
         && run->ifa_addr->sa_family == AF_INET)
       break;

      run = run->ifa_next;
    }

  freeifaddrs (ifa);

  return run != NULL;
}

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bool_t xdr_opaque_auth ( XDR ,
struct opaque_auth  
)

Definition at line 58 of file rpc_prot.c.

{

  if (INTUSE(xdr_enum) (xdrs, &(ap->oa_flavor)))
    return INTUSE(xdr_bytes) (xdrs, &ap->oa_base,
                    &ap->oa_length, MAX_AUTH_BYTES);
  return FALSE;
}

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Variable Documentation

struct clnt_ops [static]