Wed Mar 3 23:09:16 2010

Asterisk developer's documentation

udptl.h File Reference

UDPTL support for T.38. More...

#include "asterisk/network.h"
#include "asterisk/frame.h"
#include "asterisk/io.h"
#include "asterisk/sched.h"
#include "asterisk/channel.h"
Include dependency graph for udptl.h:
This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Data Structures

struct  ast_udptl_protocol

Typedefs

typedef int(* ast_udptl_callback )(struct ast_udptl *udptl, struct ast_frame *f, void *data)

Enumerations

enum  ast_t38_ec_modes { UDPTL_ERROR_CORRECTION_NONE, UDPTL_ERROR_CORRECTION_FEC, UDPTL_ERROR_CORRECTION_REDUNDANCY }

Functions

int ast_udptl_bridge (struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc)
void ast_udptl_destroy (struct ast_udptl *udptl)
int ast_udptl_fd (const struct ast_udptl *udptl)
enum ast_t38_ec_modes ast_udptl_get_error_correction_scheme (const struct ast_udptl *udptl)
unsigned int ast_udptl_get_far_max_datagram (const struct ast_udptl *udptl)
unsigned int ast_udptl_get_far_max_ifp (const struct ast_udptl *udptl)
unsigned int ast_udptl_get_local_max_datagram (const struct ast_udptl *udptl)
void ast_udptl_get_peer (const struct ast_udptl *udptl, struct sockaddr_in *them)
void ast_udptl_get_us (const struct ast_udptl *udptl, struct sockaddr_in *us)
void ast_udptl_init (void)
struct ast_udptl * ast_udptl_new (struct sched_context *sched, struct io_context *io, int callbackmode)
struct ast_udptl * ast_udptl_new_with_bindaddr (struct sched_context *sched, struct io_context *io, int callbackmode, struct in_addr in)
int ast_udptl_proto_register (struct ast_udptl_protocol *proto)
void ast_udptl_proto_unregister (struct ast_udptl_protocol *proto)
struct ast_frame * ast_udptl_read (struct ast_udptl *udptl)
int ast_udptl_reload (void)
void ast_udptl_reset (struct ast_udptl *udptl)
void ast_udptl_set_callback (struct ast_udptl *udptl, ast_udptl_callback callback)
void ast_udptl_set_data (struct ast_udptl *udptl, void *data)
void ast_udptl_set_error_correction_scheme (struct ast_udptl *udptl, enum ast_t38_ec_modes ec)
void ast_udptl_set_far_max_datagram (struct ast_udptl *udptl, unsigned int max_datagram)
void ast_udptl_set_local_max_ifp (struct ast_udptl *udptl, unsigned int max_ifp)
void ast_udptl_set_m_type (struct ast_udptl *udptl, unsigned int pt)
void ast_udptl_set_peer (struct ast_udptl *udptl, const struct sockaddr_in *them)
void ast_udptl_set_udptlmap_type (struct ast_udptl *udptl, unsigned int pt, char *mimeType, char *mimeSubtype)
void ast_udptl_setnat (struct ast_udptl *udptl, int nat)
int ast_udptl_setqos (struct ast_udptl *udptl, unsigned int tos, unsigned int cos)
void ast_udptl_stop (struct ast_udptl *udptl)
int ast_udptl_write (struct ast_udptl *udptl, struct ast_frame *f)

Detailed Description

UDPTL support for T.38.

Author:
Steve Underwood <steveu@coppice.org> udptl.c
Todo:
add doxygen documentation to this file!

Definition in file udptl.h.

Typedef Documentation

typedef int(* ast_udptl_callback)(struct ast_udptl *udptl, struct ast_frame *f, void *data)

Definition at line 57 of file udptl.h.

Enumeration Type Documentation

enum ast_t38_ec_modes
Enumerator:
UDPTL_ERROR_CORRECTION_NONE 
UDPTL_ERROR_CORRECTION_FEC 
UDPTL_ERROR_CORRECTION_REDUNDANCY 

Definition at line 36 of file udptl.h.

00036                       {
00037     UDPTL_ERROR_CORRECTION_NONE,
00038     UDPTL_ERROR_CORRECTION_FEC,
00039     UDPTL_ERROR_CORRECTION_REDUNDANCY
00040 };

Function Documentation

int ast_udptl_bridge ( struct ast_channel *  c0,
struct ast_channel *  c1,
int  flags,
struct ast_frame **  fo,
struct ast_channel **  rc 
)

Definition at line 1065 of file udptl.c.

References ast_channel_lock, ast_channel_trylock, ast_channel_unlock, ast_check_hangup(), ast_debug, AST_FRAME_MODEM, ast_frfree, ast_inet_ntoa(), ast_log(), ast_read(), ast_udptl_get_peer(), ast_waitfor_n(), ast_write(), f, ast_frame::frametype, get_proto(), ast_udptl_protocol::get_udptl_info, inaddrcmp(), LOG_WARNING, ast_channel::masq, ast_channel::masqr, ast_udptl_protocol::set_udptl_peer, and ast_channel::tech_pvt.

01066 {
01067    struct ast_frame *f;
01068    struct ast_channel *who;
01069    struct ast_channel *cs[3];
01070    struct ast_udptl *p0;
01071    struct ast_udptl *p1;
01072    struct ast_udptl_protocol *pr0;
01073    struct ast_udptl_protocol *pr1;
01074    struct sockaddr_in ac0;
01075    struct sockaddr_in ac1;
01076    struct sockaddr_in t0;
01077    struct sockaddr_in t1;
01078    void *pvt0;
01079    void *pvt1;
01080    int to;
01081    
01082    ast_channel_lock(c0);
01083    while (ast_channel_trylock(c1)) {
01084       ast_channel_unlock(c0);
01085       usleep(1);
01086       ast_channel_lock(c0);
01087    }
01088    pr0 = get_proto(c0);
01089    pr1 = get_proto(c1);
01090    if (!pr0) {
01091       ast_log(LOG_WARNING, "Can't find native functions for channel '%s'\n", c0->name);
01092       ast_channel_unlock(c0);
01093       ast_channel_unlock(c1);
01094       return -1;
01095    }
01096    if (!pr1) {
01097       ast_log(LOG_WARNING, "Can't find native functions for channel '%s'\n", c1->name);
01098       ast_channel_unlock(c0);
01099       ast_channel_unlock(c1);
01100       return -1;
01101    }
01102    pvt0 = c0->tech_pvt;
01103    pvt1 = c1->tech_pvt;
01104    p0 = pr0->get_udptl_info(c0);
01105    p1 = pr1->get_udptl_info(c1);
01106    if (!p0 || !p1) {
01107       /* Somebody doesn't want to play... */
01108       ast_channel_unlock(c0);
01109       ast_channel_unlock(c1);
01110       return -2;
01111    }
01112    if (pr0->set_udptl_peer(c0, p1)) {
01113       ast_log(LOG_WARNING, "Channel '%s' failed to talk to '%s'\n", c0->name, c1->name);
01114       memset(&ac1, 0, sizeof(ac1));
01115    } else {
01116       /* Store UDPTL peer */
01117       ast_udptl_get_peer(p1, &ac1);
01118    }
01119    if (pr1->set_udptl_peer(c1, p0)) {
01120       ast_log(LOG_WARNING, "Channel '%s' failed to talk back to '%s'\n", c1->name, c0->name);
01121       memset(&ac0, 0, sizeof(ac0));
01122    } else {
01123       /* Store UDPTL peer */
01124       ast_udptl_get_peer(p0, &ac0);
01125    }
01126    ast_channel_unlock(c0);
01127    ast_channel_unlock(c1);
01128    cs[0] = c0;
01129    cs[1] = c1;
01130    cs[2] = NULL;
01131    for (;;) {
01132       if ((c0->tech_pvt != pvt0) ||
01133          (c1->tech_pvt != pvt1) ||
01134          (c0->masq || c0->masqr || c1->masq || c1->masqr)) {
01135             ast_debug(1, "Oooh, something is weird, backing out\n");
01136             /* Tell it to try again later */
01137             return -3;
01138       }
01139       to = -1;
01140       ast_udptl_get_peer(p1, &t1);
01141       ast_udptl_get_peer(p0, &t0);
01142       if (inaddrcmp(&t1, &ac1)) {
01143          ast_debug(1, "Oooh, '%s' changed end address to %s:%d\n", 
01144             c1->name, ast_inet_ntoa(t1.sin_addr), ntohs(t1.sin_port));
01145          ast_debug(1, "Oooh, '%s' was %s:%d\n", 
01146             c1->name, ast_inet_ntoa(ac1.sin_addr), ntohs(ac1.sin_port));
01147          memcpy(&ac1, &t1, sizeof(ac1));
01148       }
01149       if (inaddrcmp(&t0, &ac0)) {
01150          ast_debug(1, "Oooh, '%s' changed end address to %s:%d\n", 
01151             c0->name, ast_inet_ntoa(t0.sin_addr), ntohs(t0.sin_port));
01152          ast_debug(1, "Oooh, '%s' was %s:%d\n", 
01153             c0->name, ast_inet_ntoa(ac0.sin_addr), ntohs(ac0.sin_port));
01154          memcpy(&ac0, &t0, sizeof(ac0));
01155       }
01156       who = ast_waitfor_n(cs, 2, &to);
01157       if (!who) {
01158          ast_debug(1, "Ooh, empty read...\n");
01159          /* check for hangup / whentohangup */
01160          if (ast_check_hangup(c0) || ast_check_hangup(c1))
01161             break;
01162          continue;
01163       }
01164       f = ast_read(who);
01165       if (!f) {
01166          *fo = f;
01167          *rc = who;
01168          ast_debug(1, "Oooh, got a %s\n", f ? "digit" : "hangup");
01169          /* That's all we needed */
01170          return 0;
01171       } else {
01172          if (f->frametype == AST_FRAME_MODEM) {
01173             /* Forward T.38 frames if they happen upon us */
01174             if (who == c0) {
01175                ast_write(c1, f);
01176             } else if (who == c1) {
01177                ast_write(c0, f);
01178             }
01179          }
01180          ast_frfree(f);
01181       }
01182       /* Swap priority. Not that it's a big deal at this point */
01183       cs[2] = cs[0];
01184       cs[0] = cs[1];
01185       cs[1] = cs[2];
01186    }
01187    return -1;
01188 }

void ast_udptl_destroy ( struct ast_udptl *  udptl  ) 

Definition at line 972 of file udptl.c.

References ast_free, ast_io_remove(), ast_udptl::fd, ast_udptl::io, and ast_udptl::ioid.

Referenced by __sip_destroy(), and create_addr_from_peer().

00973 {
00974    if (udptl->ioid)
00975       ast_io_remove(udptl->io, udptl->ioid);
00976    if (udptl->fd > -1)
00977       close(udptl->fd);
00978    ast_free(udptl);
00979 }

int ast_udptl_fd ( const struct ast_udptl *  udptl  ) 

Definition at line 630 of file udptl.c.

References ast_udptl::fd.

Referenced by __oh323_new(), and sip_new().

00631 {
00632    return udptl->fd;
00633 }

enum ast_t38_ec_modes ast_udptl_get_error_correction_scheme ( const struct ast_udptl *  udptl  ) 

Definition at line 777 of file udptl.c.

References ast_log(), ast_udptl::error_correction_scheme, and LOG_WARNING.

Referenced by add_sdp().

00778 {
00779    if (udptl)
00780       return udptl->error_correction_scheme;
00781    else {
00782       ast_log(LOG_WARNING, "udptl structure is null\n");
00783       return -1;
00784    }
00785 }

unsigned int ast_udptl_get_far_max_datagram ( const struct ast_udptl *  udptl  ) 

Definition at line 827 of file udptl.c.

References ast_log(), ast_udptl::far_max_datagram, and LOG_WARNING.

00828 {
00829    if (udptl)
00830       return udptl->far_max_datagram;
00831    else {
00832       ast_log(LOG_WARNING, "udptl structure is null\n");
00833       return 0;
00834    }
00835 }

unsigned int ast_udptl_get_far_max_ifp ( const struct ast_udptl *  udptl  ) 

Definition at line 853 of file udptl.c.

References ast_udptl::far_max_ifp.

Referenced by change_t38_state().

00854 {
00855    return udptl->far_max_ifp;
00856 }

unsigned int ast_udptl_get_local_max_datagram ( const struct ast_udptl *  udptl  ) 

Definition at line 817 of file udptl.c.

References ast_log(), ast_udptl::local_max_datagram, and LOG_WARNING.

Referenced by add_sdp().

00818 {
00819    if (udptl)
00820       return udptl->local_max_datagram;
00821    else {
00822       ast_log(LOG_WARNING, "udptl structure is null\n");
00823       return 0;
00824    }
00825 }

void ast_udptl_get_peer ( const struct ast_udptl *  udptl,
struct sockaddr_in *  them 
)

Definition at line 953 of file udptl.c.

References ast_udptl::them.

Referenced by ast_udptl_bridge(), and sip_set_udptl_peer().

00954 {
00955    memset(them, 0, sizeof(*them));
00956    them->sin_family = AF_INET;
00957    them->sin_port = udptl->them.sin_port;
00958    them->sin_addr = udptl->them.sin_addr;
00959 }

void ast_udptl_get_us ( const struct ast_udptl *  udptl,
struct sockaddr_in *  us 
)

Definition at line 961 of file udptl.c.

References ast_udptl::us.

Referenced by add_sdp().

00962 {
00963    memcpy(us, &udptl->us, sizeof(udptl->us));
00964 }

void ast_udptl_init ( void   ) 

Definition at line 1435 of file udptl.c.

References __ast_udptl_reload(), and ast_cli_register_multiple().

Referenced by main().

01436 {
01437    ast_cli_register_multiple(cli_udptl, sizeof(cli_udptl) / sizeof(struct ast_cli_entry));
01438    __ast_udptl_reload(0);
01439 }

struct ast_udptl* ast_udptl_new ( struct sched_context *  sched,
struct io_context *  io,
int  callbackmode 
) [read]

Definition at line 935 of file udptl.c.

References ast_udptl_new_with_bindaddr().

00936 {
00937    struct in_addr ia;
00938    memset(&ia, 0, sizeof(ia));
00939    return ast_udptl_new_with_bindaddr(sched, io, callbackmode, ia);
00940 }

struct ast_udptl* ast_udptl_new_with_bindaddr ( struct sched_context *  sched,
struct io_context *  io,
int  callbackmode,
struct in_addr  in 
) [read]

Definition at line 858 of file udptl.c.

References ast_calloc, ast_free, ast_io_add(), AST_IO_IN, ast_log(), ast_random(), udptl_fec_tx_buffer_t::buf_len, udptl_fec_rx_buffer_t::buf_len, errno, ast_udptl::error_correction_entries, ast_udptl::error_correction_scheme, ast_udptl::error_correction_span, ast_udptl::far_max_datagram, ast_udptl::fd, ast_udptl::flags, ast_udptl::io, ast_udptl::ioid, ast_udptl::local_max_datagram, LOG_WARNING, ast_udptl::rx, ast_udptl::sched, ast_udptl::them, ast_udptl::tx, UDPTL_BUF_MASK, udptlread(), and ast_udptl::us.

Referenced by ast_udptl_new(), create_addr_from_peer(), handle_request_invite(), and sip_alloc().

00859 {
00860    struct ast_udptl *udptl;
00861    int x;
00862    int startplace;
00863    int i;
00864    long int flags;
00865 
00866    if (!(udptl = ast_calloc(1, sizeof(*udptl))))
00867       return NULL;
00868 
00869    udptl->error_correction_scheme = udptlfectype;
00870    udptl->error_correction_span = udptlfecspan;
00871    udptl->error_correction_entries = udptlfecentries;
00872    
00873    udptl->far_max_datagram = udptlmaxdatagram;
00874    udptl->local_max_datagram = udptlmaxdatagram;
00875 
00876    for (i = 0; i <= UDPTL_BUF_MASK; i++) {
00877       udptl->rx[i].buf_len = -1;
00878       udptl->tx[i].buf_len = -1;
00879    }
00880 
00881    udptl->them.sin_family = AF_INET;
00882    udptl->us.sin_family = AF_INET;
00883 
00884    if ((udptl->fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
00885       ast_free(udptl);
00886       ast_log(LOG_WARNING, "Unable to allocate socket: %s\n", strerror(errno));
00887       return NULL;
00888    }
00889    flags = fcntl(udptl->fd, F_GETFL);
00890    fcntl(udptl->fd, F_SETFL, flags | O_NONBLOCK);
00891 #ifdef SO_NO_CHECK
00892    if (nochecksums)
00893       setsockopt(udptl->fd, SOL_SOCKET, SO_NO_CHECK, &nochecksums, sizeof(nochecksums));
00894 #endif
00895    /* Find us a place */
00896    x = (udptlstart == udptlend) ? udptlstart : (ast_random() % (udptlend - udptlstart)) + udptlstart;
00897    if (use_even_ports && (x & 1)) {
00898       ++x;
00899    }
00900    startplace = x;
00901    for (;;) {
00902       udptl->us.sin_port = htons(x);
00903       udptl->us.sin_addr = addr;
00904       if (bind(udptl->fd, (struct sockaddr *) &udptl->us, sizeof(udptl->us)) == 0)
00905          break;
00906       if (errno != EADDRINUSE) {
00907          ast_log(LOG_WARNING, "Unexpected bind error: %s\n", strerror(errno));
00908          close(udptl->fd);
00909          ast_free(udptl);
00910          return NULL;
00911       }
00912       if (use_even_ports) {
00913          x += 2;
00914       } else {
00915          ++x;
00916       }
00917       if (x > udptlend)
00918          x = udptlstart;
00919       if (x == startplace) {
00920          ast_log(LOG_WARNING, "No UDPTL ports remaining\n");
00921          close(udptl->fd);
00922          ast_free(udptl);
00923          return NULL;
00924       }
00925    }
00926    if (io && sched && callbackmode) {
00927       /* Operate this one in a callback mode */
00928       udptl->sched = sched;
00929       udptl->io = io;
00930       udptl->ioid = ast_io_add(udptl->io, udptl->fd, udptlread, AST_IO_IN, udptl);
00931    }
00932    return udptl;
00933 }

int ast_udptl_proto_register ( struct ast_udptl_protocol *  proto  ) 

Definition at line 1034 of file udptl.c.

References ast_log(), AST_RWLIST_INSERT_TAIL, AST_RWLIST_TRAVERSE, AST_RWLIST_UNLOCK, AST_RWLIST_WRLOCK, ast_udptl_protocol::list, LOG_WARNING, and ast_udptl_protocol::type.

Referenced by load_module().

01035 {
01036    struct ast_udptl_protocol *cur;
01037 
01038    AST_RWLIST_WRLOCK(&protos);
01039    AST_RWLIST_TRAVERSE(&protos, cur, list) {
01040       if (cur->type == proto->type) {
01041          ast_log(LOG_WARNING, "Tried to register same protocol '%s' twice\n", cur->type);
01042          AST_RWLIST_UNLOCK(&protos);
01043          return -1;
01044       }
01045    }
01046    AST_RWLIST_INSERT_TAIL(&protos, proto, list);
01047    AST_RWLIST_UNLOCK(&protos);
01048    return 0;
01049 }

void ast_udptl_proto_unregister ( struct ast_udptl_protocol *  proto  ) 

Definition at line 1027 of file udptl.c.

References AST_RWLIST_REMOVE, AST_RWLIST_UNLOCK, and AST_RWLIST_WRLOCK.

Referenced by unload_module().

01028 {
01029    AST_RWLIST_WRLOCK(&protos);
01030    AST_RWLIST_REMOVE(&protos, proto, list);
01031    AST_RWLIST_UNLOCK(&protos);
01032 }

struct ast_frame* ast_udptl_read ( struct ast_udptl *  udptl  )  [read]

Definition at line 662 of file udptl.c.

References ast_assert, ast_debug, AST_FRIENDLY_OFFSET, ast_inet_ntoa(), ast_log(), ast_null_frame, ast_verb, errno, ast_udptl::f, ast_udptl::fd, len(), LOG_WARNING, ast_udptl::nat, ast_udptl::rawdata, ast_udptl::them, udptl_debug_test_addr(), and udptl_rx_packet().

Referenced by sip_rtp_read(), skinny_rtp_read(), and udptlread().

00663 {
00664    int res;
00665    struct sockaddr_in sin;
00666    socklen_t len;
00667    uint16_t seqno = 0;
00668    uint16_t *udptlheader;
00669 
00670    len = sizeof(sin);
00671    
00672    /* Cache where the header will go */
00673    res = recvfrom(udptl->fd,
00674          udptl->rawdata + AST_FRIENDLY_OFFSET,
00675          sizeof(udptl->rawdata) - AST_FRIENDLY_OFFSET,
00676          0,
00677          (struct sockaddr *) &sin,
00678          &len);
00679    udptlheader = (uint16_t *)(udptl->rawdata + AST_FRIENDLY_OFFSET);
00680    if (res < 0) {
00681       if (errno != EAGAIN)
00682          ast_log(LOG_WARNING, "UDPTL read error: %s\n", strerror(errno));
00683       ast_assert(errno != EBADF);
00684       return &ast_null_frame;
00685    }
00686 
00687    /* Ignore if the other side hasn't been given an address yet. */
00688    if (!udptl->them.sin_addr.s_addr || !udptl->them.sin_port)
00689       return &ast_null_frame;
00690 
00691    if (udptl->nat) {
00692       /* Send to whoever sent to us */
00693       if ((udptl->them.sin_addr.s_addr != sin.sin_addr.s_addr) ||
00694          (udptl->them.sin_port != sin.sin_port)) {
00695          memcpy(&udptl->them, &sin, sizeof(udptl->them));
00696          ast_debug(1, "UDPTL NAT: Using address %s:%d\n", ast_inet_ntoa(udptl->them.sin_addr), ntohs(udptl->them.sin_port));
00697       }
00698    }
00699 
00700    if (udptl_debug_test_addr(&sin)) {
00701       ast_verb(1, "Got UDPTL packet from %s:%d (type %d, seq %d, len %d)\n",
00702             ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), 0, seqno, res);
00703    }
00704 #if 0
00705    printf("Got UDPTL packet from %s:%d (seq %d, len = %d)\n", ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), seqno, res);
00706 #endif
00707    if (udptl_rx_packet(udptl, udptl->rawdata + AST_FRIENDLY_OFFSET, res) < 1)
00708       return &ast_null_frame;
00709 
00710    return &udptl->f[0];
00711 }

int ast_udptl_reload ( void   ) 
Version:
1.6.1 return changed to int

Definition at line 1429 of file udptl.c.

References __ast_udptl_reload().

01430 {
01431    __ast_udptl_reload(1);
01432    return 0;
01433 }

void ast_udptl_reset ( struct ast_udptl *  udptl  ) 
void ast_udptl_set_callback ( struct ast_udptl *  udptl,
ast_udptl_callback  callback 
)

Definition at line 640 of file udptl.c.

References ast_udptl::callback.

00641 {
00642    udptl->callback = callback;
00643 }

void ast_udptl_set_data ( struct ast_udptl *  udptl,
void *  data 
)

Definition at line 635 of file udptl.c.

References ast_udptl::data.

00636 {
00637    udptl->data = data;
00638 }

void ast_udptl_set_error_correction_scheme ( struct ast_udptl *  udptl,
enum ast_t38_ec_modes  ec 
)

Definition at line 787 of file udptl.c.

References ast_log(), calculate_far_max_ifp(), calculate_local_max_datagram(), ast_udptl::error_correction_entries, ast_udptl::error_correction_scheme, ast_udptl::error_correction_span, LOG_WARNING, UDPTL_ERROR_CORRECTION_FEC, and UDPTL_ERROR_CORRECTION_REDUNDANCY.

Referenced by process_sdp(), and set_t38_capabilities().

00788 {
00789    if (udptl) {
00790       udptl->error_correction_scheme = ec;
00791       switch (ec) {
00792       case UDPTL_ERROR_CORRECTION_FEC:
00793          udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_FEC;
00794          if (udptl->error_correction_entries == 0) {
00795             udptl->error_correction_entries = 3;
00796          }
00797          if (udptl->error_correction_span == 0) {
00798             udptl->error_correction_span = 3;
00799          }
00800          break;
00801       case UDPTL_ERROR_CORRECTION_REDUNDANCY:
00802          udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_REDUNDANCY;
00803          if (udptl->error_correction_entries == 0) {
00804             udptl->error_correction_entries = 3;
00805          }
00806          break;
00807       default:
00808          /* nothing to do */
00809          break;
00810       };
00811       calculate_local_max_datagram(udptl);
00812       calculate_far_max_ifp(udptl);
00813    } else
00814       ast_log(LOG_WARNING, "udptl structure is null\n");
00815 }

void ast_udptl_set_far_max_datagram ( struct ast_udptl *  udptl,
unsigned int  max_datagram 
)

Definition at line 837 of file udptl.c.

References ast_log(), calculate_far_max_ifp(), ast_udptl::far_max_datagram, and LOG_WARNING.

Referenced by process_sdp().

00838 {
00839    if (udptl) {
00840       udptl->far_max_datagram = max_datagram;
00841       calculate_far_max_ifp(udptl);
00842    } else {
00843       ast_log(LOG_WARNING, "udptl structure is null\n");
00844    }
00845 }

void ast_udptl_set_local_max_ifp ( struct ast_udptl *  udptl,
unsigned int  max_ifp 
)

Definition at line 847 of file udptl.c.

References calculate_local_max_datagram(), and ast_udptl::local_max_ifp.

Referenced by interpret_t38_parameters().

00848 {
00849    udptl->local_max_ifp = max_ifp;
00850    calculate_local_max_datagram(udptl);
00851 }

void ast_udptl_set_m_type ( struct ast_udptl *  udptl,
unsigned int  pt 
)
void ast_udptl_set_peer ( struct ast_udptl *  udptl,
const struct sockaddr_in *  them 
)

Definition at line 947 of file udptl.c.

References ast_udptl::them.

Referenced by process_sdp().

00948 {
00949    udptl->them.sin_port = them->sin_port;
00950    udptl->them.sin_addr = them->sin_addr;
00951 }

void ast_udptl_set_udptlmap_type ( struct ast_udptl *  udptl,
unsigned int  pt,
char *  mimeType,
char *  mimeSubtype 
)
void ast_udptl_setnat ( struct ast_udptl *  udptl,
int  nat 
)

Definition at line 645 of file udptl.c.

References ast_udptl::nat.

Referenced by do_setnat().

00646 {
00647    udptl->nat = nat;
00648 }

int ast_udptl_setqos ( struct ast_udptl *  udptl,
unsigned int  tos,
unsigned int  cos 
)

Definition at line 942 of file udptl.c.

References ast_netsock_set_qos(), and ast_udptl::fd.

Referenced by sip_alloc().

00943 {
00944    return ast_netsock_set_qos(udptl->fd, tos, cos, "UDPTL");
00945 }

void ast_udptl_stop ( struct ast_udptl *  udptl  ) 

Definition at line 966 of file udptl.c.

References ast_udptl::them.

Referenced by process_sdp(), and stop_media_flows().

00967 {
00968    memset(&udptl->them.sin_addr, 0, sizeof(udptl->them.sin_addr));
00969    memset(&udptl->them.sin_port, 0, sizeof(udptl->them.sin_port));
00970 }

int ast_udptl_write ( struct ast_udptl *  udptl,
struct ast_frame *  f 
)

Definition at line 981 of file udptl.c.

References AST_FRAME_MODEM, ast_inet_ntoa(), ast_log(), AST_MODEM_T38, ast_verb, buf, ast_frame::data, ast_frame::datalen, errno, ast_udptl::far_max_datagram, ast_udptl::far_max_ifp, ast_udptl::fd, ast_frame::frametype, len(), LOG_NOTICE, LOG_WARNING, ast_frame::ptr, seq, ast_frame::subclass, ast_udptl::them, ast_udptl::tx_seq_no, udptl_build_packet(), and udptl_debug_test_addr().

Referenced by sip_write().

00982 {
00983    unsigned int seq;
00984    unsigned int len;
00985    int res;
00986    uint8_t buf[s->far_max_datagram];
00987 
00988    /* If we have no peer, return immediately */ 
00989    if (s->them.sin_addr.s_addr == INADDR_ANY)
00990       return 0;
00991 
00992    /* If there is no data length, return immediately */
00993    if (f->datalen == 0)
00994       return 0;
00995    
00996    if ((f->frametype != AST_FRAME_MODEM) ||
00997        (f->subclass != AST_MODEM_T38)) {
00998       ast_log(LOG_WARNING, "UDPTL can only send T.38 data.\n");
00999       return -1;
01000    }
01001 
01002    if (f->datalen > s->far_max_ifp) {
01003       ast_log(LOG_WARNING, "UDPTL asked to send %d bytes of IFP when far end only prepared to accept %d bytes; data loss may occur.\n", f->datalen, s->far_max_ifp);
01004    }
01005 
01006    /* Save seq_no for debug output because udptl_build_packet increments it */
01007    seq = s->tx_seq_no & 0xFFFF;
01008 
01009    /* Cook up the UDPTL packet, with the relevant EC info. */
01010    len = udptl_build_packet(s, buf, sizeof(buf), f->data.ptr, f->datalen);
01011 
01012    if (len > 0 && s->them.sin_port && s->them.sin_addr.s_addr) {
01013       if ((res = sendto(s->fd, buf, len, 0, (struct sockaddr *) &s->them, sizeof(s->them))) < 0)
01014          ast_log(LOG_NOTICE, "UDPTL Transmission error to %s:%d: %s\n", ast_inet_ntoa(s->them.sin_addr), ntohs(s->them.sin_port), strerror(errno));
01015 #if 0
01016       printf("Sent %d bytes of UDPTL data to %s:%d\n", res, ast_inet_ntoa(udptl->them.sin_addr), ntohs(udptl->them.sin_port));
01017 #endif
01018       if (udptl_debug_test_addr(&s->them))
01019          ast_verb(1, "Sent UDPTL packet to %s:%d (type %d, seq %d, len %d)\n",
01020                ast_inet_ntoa(s->them.sin_addr),
01021                ntohs(s->them.sin_port), 0, seq, len);
01022    }
01023       
01024    return 0;
01025 }

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