Wed Oct 28 15:47:51 2009

Asterisk developer's documentation


chan_modem.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 1999 - 2006, Digium, Inc.
00005  *
00006  * Mark Spencer <markster@digium.com>
00007  *
00008  * See http://www.asterisk.org for more information about
00009  * the Asterisk project. Please do not directly contact
00010  * any of the maintainers of this project for assistance;
00011  * the project provides a web site, mailing lists and IRC
00012  * channels for your use.
00013  *
00014  * This program is free software, distributed under the terms of
00015  * the GNU General Public License Version 2. See the LICENSE file
00016  * at the top of the source tree.
00017  */
00018 
00019 /*! \file
00020  *
00021  * \brief A/Open ITU-56/2 Voice Modem Driver (Rockwell, IS-101, and others)
00022  * 
00023  * \ingroup channel_drivers
00024  */
00025 
00026 #include <stdio.h>
00027 #include <stdlib.h>
00028 #include <ctype.h>
00029 #include <string.h>
00030 #include <sys/time.h>
00031 #include <errno.h>
00032 #include <netinet/in.h>
00033 #include <arpa/inet.h>
00034 #include <sys/socket.h>
00035 #include <fcntl.h>
00036 #include <sys/ioctl.h>
00037 #include <sys/termios.h>
00038 #include <sys/signal.h>
00039 
00040 #include "asterisk.h"
00041 
00042 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 211526 $")
00043 
00044 #include "asterisk/lock.h"
00045 #include "asterisk/channel.h"
00046 #include "asterisk/config.h"
00047 #include "asterisk/logger.h"
00048 #include "asterisk/module.h"
00049 #include "asterisk/pbx.h"
00050 #include "asterisk/options.h"
00051 #include "asterisk/vmodem.h"
00052 #include "asterisk/utils.h"
00053 
00054 /* Up to 10 seconds for an echo to arrive */
00055 #define ECHO_TIMEOUT 10
00056 
00057 static const char desc[] = "Generic Voice Modem Driver";
00058 static const char tdesc[] = "Generic Voice Modem Channel Driver";
00059 static const char type[] = "Modem";
00060 static const char config[] = "modem.conf";
00061 static char dialtype = 'T';
00062 static int gmode = MODEM_MODE_IMMEDIATE;
00063 
00064 /* Default modem type */
00065 static char mtype[80] = "autodetect";
00066 /* Default context for incoming calls */
00067 static char context[AST_MAX_EXTENSION]= "default";
00068 
00069 /* Default language */
00070 static char language[MAX_LANGUAGE] = "";
00071 
00072 /* Initialization String */
00073 static char initstr[AST_MAX_INIT_STR] = "ATE0Q0";
00074 
00075 /* Default MSN */
00076 static char msn[AST_MAX_EXTENSION]="";
00077 
00078 /* Default Listen */
00079 static char incomingmsn[AST_MAX_EXTENSION]="";
00080 
00081 /* Default DTMF-detection mode (i4l/asterisk) */
00082 static int dtmfmode = MODEM_DTMF_AST;
00083 /* Default DTMF-generation mode (i4l (outband) / asterisk (inband) */
00084 static int dtmfmodegen = MODEM_DTMF_AST;
00085 
00086 struct ast_dsp *dsp = NULL;
00087 
00088 /* Default valid outgoing MSN */
00089 static char outgoingmsn[AST_MAX_EXTENSION]="";
00090 
00091 /* Default group */
00092 static ast_group_t cur_group = 0;
00093 
00094 static int usecnt =0;
00095 
00096 static int baudrate = 115200;
00097 
00098 static int stripmsd = 0;
00099 
00100 AST_MUTEX_DEFINE_STATIC(usecnt_lock);
00101 
00102 /* Protect the interface list (of ast_modem_pvt's) */
00103 AST_MUTEX_DEFINE_STATIC(iflock);
00104 
00105 /* Protect the monitoring thread, so only one process can kill or start it, and not
00106    when it's doing something critical. */
00107 AST_MUTEX_DEFINE_STATIC(monlock);
00108 
00109 /* This is the thread for the monitor which checks for input on the channels
00110    which are not currently in use.  */
00111 static pthread_t monitor_thread = AST_PTHREADT_NULL;
00112 
00113 static int restart_monitor(void);
00114 
00115 int dep_warning = 0;
00116 
00117 static struct ast_channel *modem_request(const char *type, int format, void *data, int *cause);
00118 static int modem_digit(struct ast_channel *ast, char digit);
00119 static int modem_call(struct ast_channel *ast, char *idest, int timeout);
00120 static int modem_hangup(struct ast_channel *ast);
00121 static int modem_answer(struct ast_channel *ast);
00122 static struct ast_frame *modem_read(struct ast_channel *);
00123 static int modem_write(struct ast_channel *ast, struct ast_frame *frame);
00124 static int modem_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
00125 
00126 static const struct ast_channel_tech modem_tech = {
00127    .type = type,
00128    .description = tdesc,
00129    .capabilities = AST_FORMAT_SLINEAR,
00130    .requester = modem_request,
00131    .send_digit = modem_digit,
00132    .call = modem_call,
00133    .hangup = modem_hangup,
00134    .answer = modem_answer,
00135    .read = modem_read,
00136    .write = modem_write,
00137    .fixup = modem_fixup,
00138 };
00139 
00140 /* The private structures of the Phone Jack channels are linked for
00141    selecting outgoing channels */
00142    
00143 static struct ast_modem_pvt  *iflist = NULL;
00144 
00145 static int modem_digit(struct ast_channel *ast, char digit)
00146 {
00147    struct ast_modem_pvt *p;
00148    p = ast->tech_pvt;
00149    if (p->mc->dialdigit)
00150       return p->mc->dialdigit(p, digit);
00151    ast_log(LOG_DEBUG, "Channel %s lacks digit dialing\n", ast->name);
00152    return -1;
00153 }
00154 
00155 static struct ast_modem_driver *drivers = NULL;
00156 
00157 static struct ast_modem_driver *find_capability(char *ident)
00158 {
00159    struct ast_modem_driver *mc;
00160    int x;
00161    mc = drivers;
00162    while(mc) {
00163       for (x=0;mc->idents[x];x++) {
00164          if (!strcmp(ident, mc->idents[x])) 
00165             break;
00166       }
00167       if (mc->idents[x])
00168          break;
00169       mc = mc->next;
00170    }
00171    if (mc) {
00172       if (mc->incusecnt)
00173          mc->incusecnt();
00174    }
00175    return mc;
00176 }
00177 
00178 static struct ast_modem_driver *find_driver(char *drv)
00179 {
00180    struct ast_modem_driver *mc;
00181    mc = drivers;
00182    while(mc) {
00183       if (!strcasecmp(mc->name, drv))  
00184          break;
00185       mc = mc->next;
00186    }
00187    if (mc) {
00188       if (mc->incusecnt)
00189          mc->incusecnt();
00190    }
00191    return mc;
00192 }
00193 
00194 int ast_register_modem_driver(struct ast_modem_driver *mc)
00195 {
00196    mc->next = drivers;
00197    drivers = mc;
00198    return 0;
00199 }
00200 
00201 int ast_unregister_modem_driver(struct ast_modem_driver *mc)
00202 {
00203    struct ast_modem_driver *last = NULL, *cur;
00204    cur = drivers;
00205    while(cur) {
00206       if (cur == mc) {
00207          if (last)
00208             last->next = mc->next;
00209          else
00210             drivers = mc->next;
00211          return 0;
00212       }
00213       cur = cur->next;
00214    }
00215    return -1;
00216 }
00217 
00218 static int modem_call(struct ast_channel *ast, char *idest, int timeout)
00219 {
00220    struct ast_modem_pvt *p;
00221    int ms = timeout;
00222    char rdest[80], *where, dstr[100] = "";
00223    char *stringp=NULL;
00224    strncpy(rdest, idest, sizeof(rdest)-1);
00225    stringp=rdest;
00226    strsep(&stringp, ":");
00227    where = strsep(&stringp, ":");
00228    if (!where) {
00229       ast_log(LOG_WARNING, "Destination %s requres a real destination (device:destination)\n", idest);
00230       return -1;
00231    }
00232    p = ast->tech_pvt;
00233    strncpy(dstr, where + p->stripmsd, sizeof(dstr) - 1);
00234    /* if not a transfer or just sending tones, must be in correct state */
00235    if (strcasecmp(rdest, "transfer") && strcasecmp(rdest,"sendtones")) {
00236       if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) {
00237          ast_log(LOG_WARNING, "modem_call called on %s, neither down nor reserved\n", ast->name);
00238          return -1;
00239       }
00240    } 
00241    if (!strcasecmp(rdest,"transfer")) /* if a transfer, put in transfer stuff */
00242    {
00243       snprintf(dstr, sizeof(dstr), "!,%s", where + p->stripmsd);
00244    }
00245    if (!strcasecmp(where, "handset")) {
00246       if (p->mc->setdev)
00247          if (p->mc->setdev(p, MODEM_DEV_HANDSET))
00248             return -1;
00249       /* Should be immediately up */
00250       ast_setstate(ast, AST_STATE_UP);
00251    } else {
00252       if (p->mc->setdev)
00253          if (p->mc->setdev(p, MODEM_DEV_TELCO_SPK))
00254             return -1;
00255       if (p->mc->dial)
00256          p->mc->dial(p, dstr);
00257       ast_setstate(ast, AST_STATE_DIALING);
00258       while((ast->_state != AST_STATE_UP) && (ms > 0)) {
00259          ms = ast_waitfor(ast, ms);
00260          /* Just read packets and watch what happens */
00261          if (ms > 0) {
00262             if (!modem_read(ast))
00263                return -1;
00264          }
00265       }
00266       if (ms < 0) 
00267          return -1;
00268    }
00269    return 0;
00270 }
00271 
00272 int ast_modem_send(struct ast_modem_pvt *p, char *cmd, int len)
00273 {
00274    int i;
00275    usleep(5000);
00276    if (!len) {
00277       for(i = 0; cmd[i];)
00278          {
00279          if (fwrite(cmd + i,1,1,p->f) != 1)
00280             {
00281             if (errno == EWOULDBLOCK) continue;
00282             return -1;
00283             }
00284          i++;
00285          }
00286       tcdrain(fileno(p->f)); 
00287       fprintf(p->f,"\r\n");
00288       return 0;
00289    } else {
00290       if (fwrite(cmd, 1, len, p->f) < len)
00291          return -1;
00292       return 0;
00293    }
00294 }
00295 
00296 int ast_modem_read_response(struct ast_modem_pvt *p, int timeout)
00297 {
00298    int res = -1,c,i;
00299    timeout *= 1000;
00300    p->response[0] = 0;
00301    c = i = 0;
00302    do {
00303       res = ast_waitfor_n_fd(&p->fd, 1, &timeout, NULL);
00304       if (res < 0) {
00305          strncpy(p->response, "(No Response)", sizeof(p->response)-1);
00306          return -1;
00307       }
00308         /* get no more then buffer length */
00309       while(i < sizeof(p->response) - 1)
00310       {
00311          c = fgetc(p->f);  /* get a char */
00312          if (c < 1) /* if error */
00313          {
00314               /* if nothing in buffer, go back into timeout stuff */
00315             if (errno == EWOULDBLOCK) break;
00316             /* return as error */
00317             strncpy(p->response, "(No Response)", sizeof(p->response)-1);
00318             return -1;
00319          }
00320            /* save char */
00321          p->response[i++] = c;
00322          p->response[i] = 0;        
00323            /* if end of input */
00324          if (c == '\n') break;
00325       }
00326       if (c >= 0)  /* if input terminated normally */
00327       {
00328            /* ignore just CR/LF */
00329          if (!strcmp(p->response,"\r\n"))
00330          {
00331               /* reset input buffer stuff */
00332             i = 0; 
00333             p->response[0] = 0;
00334          }
00335          else /* otherwise return with info in buffer */
00336          {
00337             return 0;
00338          }
00339       }
00340    } while(timeout > 0);
00341    strncpy(p->response, "(No Response)", sizeof(p->response)-1);
00342    return -1;
00343 }
00344 
00345 int ast_modem_expect(struct ast_modem_pvt *p, char *result, int timeout)
00346 {
00347    int res = -1;
00348    timeout *= 1000;
00349    strncpy(p->response, "(No Response)", sizeof(p->response)-1);
00350    do {
00351       res = ast_waitfor_n_fd(&p->fd, 1, &timeout, NULL);
00352       if (res < 0) {
00353          return -1;
00354       }
00355       /* Read a response */
00356       fgets(p->response, sizeof(p->response), p->f);
00357       if (!strncasecmp(p->response, result, strlen(result))) 
00358          return 0;
00359    } while(timeout > 0);
00360    return -1;
00361 }
00362 
00363 void ast_modem_trim(char *s)
00364 {
00365    int x;
00366    x = strlen(s) - 1;
00367    while(x >= 0) {
00368       if ((s[x] != '\r') && (s[x] != '\n') && (s[x] != ' '))
00369          break;
00370       s[x] = '\0';
00371       x--;
00372    }
00373 }
00374 
00375 static int modem_setup(struct ast_modem_pvt *p, int baudrate)
00376 {
00377 
00378    /* Make sure there's a modem there and that it's in a reasonable 
00379       mode.  Set the baud rate, etc.  */
00380    char identity[256];
00381    char *ident = NULL;
00382    char etx[2] = { 0x10, '!' }; 
00383    if (option_debug)
00384       ast_log(LOG_DEBUG, "Setting up modem %s\n", p->dev);
00385    if (ast_modem_send(p, etx, 2)) {
00386       ast_log(LOG_WARNING, "Failed to send ETX?\n");
00387       return -1;
00388    }
00389    if (ast_modem_send(p, "\r\n", 2)) {
00390       ast_log(LOG_WARNING, "Failed to send enter?\n");
00391       return -1;
00392    }
00393    usleep(10000);
00394    /* Read any outstanding stuff */
00395    while(!ast_modem_read_response(p, 0));
00396    if (ast_modem_send(p, "ATZ", 0)) {
00397       ast_log(LOG_WARNING, "Modem not responding on %s\n", p->dev);
00398       return -1;
00399    }
00400    if (ast_modem_expect(p, "OK", ECHO_TIMEOUT)) {
00401       ast_log(LOG_WARNING, "Modem reset failed: %s\n", p->response);
00402       return -1;
00403    }
00404    if (ast_modem_send(p, p->initstr, 0)) {
00405       ast_log(LOG_WARNING, "Modem not responding on %s\n", p->dev);
00406       return -1;
00407    }
00408    if (ast_modem_expect(p, "OK", ECHO_TIMEOUT)) {
00409       ast_log(LOG_WARNING, "Modem initialization failed: %s\n", p->response);
00410       return -1;
00411    }
00412    if (ast_modem_send(p, "ATI3", 0)) {
00413       ast_log(LOG_WARNING, "Modem not responding on %s\n", p->dev);
00414       return -1;
00415    }
00416    if (ast_modem_read_response(p, ECHO_TIMEOUT)) {
00417       ast_log(LOG_WARNING, "Modem did not provide identification\n");
00418       return -1;
00419    }
00420    strncpy(identity, p->response, sizeof(identity)-1);
00421    ast_modem_trim(identity);
00422    if (ast_modem_expect(p, "OK", ECHO_TIMEOUT)) {
00423       ast_log(LOG_WARNING, "Modem did not provide identification\n");
00424       return -1;
00425    }
00426    if (!strcasecmp(mtype, "autodetect")) {
00427       p->mc = find_capability(identity);
00428       if (!p->mc) {
00429          ast_log(LOG_WARNING, "Unable to autodetect modem.  You'll need to specify a driver in modem.conf.  Please report modem identification (%s) and which driver works to markster@linux-support.net.\n", identity); 
00430          return -1;
00431       }
00432    } else {
00433       p->mc = find_driver(mtype);
00434       if (!p->mc) {
00435          ast_log(LOG_WARNING, "No driver for modem type '%s'\n", mtype);
00436          return -1;
00437       }
00438    }
00439    if (p->mc->init) {
00440       if (p->mc->init(p)) {
00441          ast_log(LOG_WARNING, "Modem Initialization Failed on '%s', driver %s.\n", p->dev, p->mc->name);
00442          p->mc->decusecnt();
00443          return -1;
00444       }
00445    }        
00446    if (option_verbose > 2) {
00447       ast_verbose(VERBOSE_PREFIX_3 "Configured modem %s with driver %s (%s)\n", p->dev, p->mc->name, p->mc->identify ? (ident = p->mc->identify(p)) : "No identification");
00448    }
00449    if (ident)
00450       free(ident);
00451    return 0;
00452 }
00453 
00454 static int modem_hangup(struct ast_channel *ast)
00455 {
00456    struct ast_modem_pvt *p;
00457    if (option_debug)
00458       ast_log(LOG_DEBUG, "modem_hangup(%s)\n", ast->name);
00459    p = ast->tech_pvt;
00460    /* Hang up */
00461    if (p->mc->hangup)
00462       p->mc->hangup(p);
00463    /* Re-initialize */
00464    if (p->mc->init)
00465       p->mc->init(p);
00466    ast_setstate(ast, AST_STATE_DOWN);
00467    memset(p->cid_num, 0, sizeof(p->cid_num));
00468    memset(p->cid_name, 0, sizeof(p->cid_name));
00469    memset(p->dnid, 0, sizeof(p->dnid));
00470    ((struct ast_modem_pvt *)(ast->tech_pvt))->owner = NULL;
00471    ast_mutex_lock(&usecnt_lock);
00472    usecnt--;
00473    if (usecnt < 0) 
00474       ast_log(LOG_WARNING, "Usecnt < 0???\n");
00475    ast_mutex_unlock(&usecnt_lock);
00476    ast_update_use_count();
00477    if (option_verbose > 2) 
00478       ast_verbose( VERBOSE_PREFIX_3 "Hungup '%s'\n", ast->name);
00479    ast->tech_pvt = NULL;
00480    ast_setstate(ast, AST_STATE_DOWN);
00481    restart_monitor();
00482    return 0;
00483 }
00484 
00485 static int modem_answer(struct ast_channel *ast)
00486 {
00487    struct ast_modem_pvt *p;
00488    int res=0;
00489    if (option_debug)
00490       ast_log(LOG_DEBUG, "modem_answer(%s)\n", ast->name);
00491    p = ast->tech_pvt;
00492    if (p->mc->answer) {
00493       res = p->mc->answer(p);
00494    }
00495    if (!res) {
00496       ast->rings = 0;
00497       ast_setstate(ast, AST_STATE_UP);
00498    }
00499    return res;
00500 }
00501 
00502 #if   0
00503 static char modem_2digit(char c)
00504 {
00505    if (c == 12)
00506       return '#';
00507    else if (c == 11)
00508       return '*';
00509    else if ((c < 10) && (c >= 0))
00510       return '0' + c - 1;
00511    else
00512       return '?';
00513 }
00514 #endif
00515 static struct ast_frame *modem_read(struct ast_channel *ast)
00516 {
00517    struct ast_modem_pvt *p = ast->tech_pvt;
00518    struct ast_frame *fr=NULL;
00519    if (p->mc->read)
00520       fr = p->mc->read(p);
00521    return fr;
00522 }
00523 
00524 static int modem_write(struct ast_channel *ast, struct ast_frame *frame)
00525 {
00526    int res=0;
00527    long flags;
00528    struct ast_modem_pvt *p = ast->tech_pvt;
00529 
00530    /* Modems tend to get upset when they receive data whilst in
00531     * command mode. This makes esp. dial commands short lived.
00532     *     Pauline Middelink - 2002-09-24 */
00533    if (ast->_state != AST_STATE_UP)
00534       return 0;
00535 
00536    /* Temporarily make non-blocking */
00537    flags = fcntl(ast->fds[0], F_GETFL);
00538    fcntl(ast->fds[0], F_SETFL, flags | O_NONBLOCK);
00539 
00540    if (p->mc->write)
00541       res = p->mc->write(p, frame);
00542 
00543    /* Block again */
00544    fcntl(ast->fds[0], F_SETFL, flags);
00545    return res;
00546 }
00547 
00548 static int modem_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
00549 {
00550         struct ast_modem_pvt *p = newchan->tech_pvt;
00551 ast_log(LOG_WARNING, "fixup called\n");
00552    if (p->owner!=oldchan) {
00553        ast_log(LOG_WARNING, "old channel wasn't %p but was %p\n",oldchan,p->owner);
00554        return -1;
00555    }
00556    p->owner = newchan;
00557         return 0; 
00558 }
00559 
00560 struct ast_channel *ast_modem_new(struct ast_modem_pvt *i, int state)
00561 {
00562    struct ast_channel *tmp;
00563    tmp = ast_channel_alloc(1);
00564    if (tmp) {
00565       tmp->tech = &modem_tech;
00566       snprintf(tmp->name, sizeof(tmp->name), "Modem[%s]/%s", i->mc->name, i->dev + 5);
00567       tmp->type = type;
00568       tmp->fds[0] = i->fd;
00569       tmp->nativeformats = i->mc->formats;
00570       ast_setstate(tmp, state);
00571       if (state == AST_STATE_RING)
00572          tmp->rings = 1;
00573       tmp->tech_pvt = i;
00574       strncpy(tmp->context, i->context, sizeof(tmp->context)-1);
00575 
00576       if (!ast_strlen_zero(i->cid_num)) {
00577          tmp->cid.cid_num = strdup(i->cid_num);
00578          tmp->cid.cid_ani = strdup(i->cid_num);
00579       }
00580       if (!ast_strlen_zero(i->cid_name))
00581          tmp->cid.cid_name = strdup(i->cid_name);
00582 
00583       if (!ast_strlen_zero(i->language))
00584          strncpy(tmp->language,i->language, sizeof(tmp->language)-1);
00585       if (!ast_strlen_zero(i->dnid))
00586          strncpy(tmp->exten, i->dnid, sizeof(tmp->exten) - 1);
00587       i->owner = tmp;
00588       ast_mutex_lock(&usecnt_lock);
00589       usecnt++;
00590       ast_mutex_unlock(&usecnt_lock);
00591       ast_update_use_count();
00592       if (state != AST_STATE_DOWN) {
00593          if (ast_pbx_start(tmp)) {
00594             ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
00595             ast_hangup(tmp);
00596             tmp = NULL;
00597          }
00598       }
00599    } else
00600       ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
00601    return tmp;
00602 }
00603 
00604 static void modem_mini_packet(struct ast_modem_pvt *i)
00605 {
00606    struct ast_frame *fr;
00607    fr = i->mc->read(i);
00608    if (!fr) return;
00609    if (fr->frametype == AST_FRAME_CONTROL) {
00610       if (fr->subclass == AST_CONTROL_RING) {
00611          ast_modem_new(i, AST_STATE_RING);
00612       }
00613    }
00614 }
00615 
00616 static void *do_monitor(void *data)
00617 {
00618    fd_set rfds, efds;
00619    int n, res;
00620    struct ast_modem_pvt *i;
00621    /* This thread monitors all the frame relay interfaces which are not yet in use
00622       (and thus do not have a separate thread) indefinitely */
00623    /* From here on out, we die whenever asked */
00624 #if 0
00625    if (pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL)) {
00626       ast_log(LOG_WARNING, "Unable to set cancel type to asynchronous\n");
00627       return NULL;
00628    }
00629 #endif
00630    for(;;) {
00631       /* Don't let anybody kill us right away.  Nobody should lock the interface list
00632          and wait for the monitor list, but the other way around is okay. */
00633       if (ast_mutex_lock(&monlock)) {
00634          ast_log(LOG_ERROR, "Unable to grab monitor lock\n");
00635          return NULL;
00636       }
00637       /* Lock the interface list */
00638       if (ast_mutex_lock(&iflock)) {
00639          ast_log(LOG_ERROR, "Unable to grab interface lock\n");
00640          ast_mutex_unlock(&monlock);
00641          return NULL;
00642       }
00643       /* Build the stuff we're going to select on, that is the socket of every
00644          ast_modem_pvt that does not have an associated owner channel */
00645       n = -1;
00646       FD_ZERO(&rfds);
00647       FD_ZERO(&efds);
00648       i = iflist;
00649       while(i) {
00650          if (FD_ISSET(i->fd, &rfds)) 
00651             ast_log(LOG_WARNING, "Descriptor %d appears twice (%s)?\n", i->fd, i->dev);
00652          if (!i->owner) {
00653             /* This needs to be watched, as it lacks an owner */
00654             FD_SET(i->fd, &rfds);
00655             FD_SET(i->fd, &efds);
00656             if (i->fd > n)
00657                n = i->fd;
00658          }
00659          
00660          i = i->next;
00661       }
00662       /* Okay, now that we know what to do, release the interface lock */
00663       ast_mutex_unlock(&iflock);
00664       
00665       /* And from now on, we're okay to be killed, so release the monitor lock as well */
00666       ast_mutex_unlock(&monlock);
00667 #if 0
00668       ast_log(LOG_DEBUG, "In monitor, n=%d, pid=%d\n", n, getpid());
00669 #endif
00670       /* Wait indefinitely for something to happen */
00671       pthread_testcancel();
00672       res = ast_select(n + 1, &rfds, NULL, &efds, NULL);
00673       pthread_testcancel();
00674       /* Okay, select has finished.  Let's see what happened.  */
00675       if (res < 1) {
00676          if ((errno != EINTR) && (errno != EAGAIN))
00677             ast_log(LOG_WARNING, "select return %d: %s\n", res, strerror(errno));
00678          continue;
00679       }
00680       /* Alright, lock the interface list again, and let's look and see what has
00681          happened */
00682       if (ast_mutex_lock(&iflock)) {
00683          ast_log(LOG_WARNING, "Unable to lock the interface list\n");
00684          continue;
00685       }
00686       i = iflist;
00687       while(i) {
00688          if (FD_ISSET(i->fd, &rfds) || FD_ISSET(i->fd, &efds)) {
00689             if (i->owner) {
00690                ast_log(LOG_WARNING, "Whoa....  I'm owned but found (%d, %s)...\n", i->fd, i->dev);
00691                i = i->next;
00692                continue;
00693             }
00694             modem_mini_packet(i);
00695          }
00696          i=i->next;
00697       }
00698       ast_mutex_unlock(&iflock);
00699    }
00700    /* Never reached */
00701    return NULL;
00702    
00703 }
00704 
00705 static int restart_monitor()
00706 {
00707    /* If we're supposed to be stopped -- stay stopped */
00708    if (monitor_thread == AST_PTHREADT_STOP)
00709       return 0;
00710    if (ast_mutex_lock(&monlock)) {
00711       ast_log(LOG_WARNING, "Unable to lock monitor\n");
00712       return -1;
00713    }
00714    if (monitor_thread == pthread_self()) {
00715       ast_mutex_unlock(&monlock);
00716       ast_log(LOG_WARNING, "Cannot kill myself\n");
00717       return -1;
00718    }
00719    if (monitor_thread != AST_PTHREADT_NULL) {
00720       /* Wake up the thread */
00721       pthread_kill(monitor_thread, SIGURG);
00722    } else {
00723       /* Start a new monitor */
00724       if (ast_pthread_create(&monitor_thread, NULL, do_monitor, NULL) < 0) {
00725          ast_mutex_unlock(&monlock);
00726          ast_log(LOG_ERROR, "Unable to start monitor thread.\n");
00727          return -1;
00728       }
00729    }
00730    ast_mutex_unlock(&monlock);
00731    return 0;
00732 }
00733 
00734 static void stty(struct ast_modem_pvt *p)
00735 {
00736    struct termios mode;
00737    memset(&mode, 0, sizeof(mode));
00738    if (tcgetattr(p->fd, &mode)) {
00739       ast_log(LOG_WARNING, "Unable to get serial parameters on %s: %s\n", p->dev, strerror(errno));
00740       return;
00741    }
00742 #ifndef SOLARIS
00743    cfmakeraw(&mode);
00744 #else
00745         mode.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
00746                         |INLCR|IGNCR|ICRNL|IXON);
00747         mode.c_oflag &= ~OPOST;
00748         mode.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
00749         mode.c_cflag &= ~(CSIZE|PARENB);
00750         mode.c_cflag |= CS8;
00751 #endif
00752 
00753    cfsetispeed(&mode, B115200);
00754    cfsetospeed(&mode, B115200);
00755    if (tcsetattr(p->fd, TCSANOW, &mode)) 
00756       ast_log(LOG_WARNING, "Unable to set serial parameters on %s: %s\n", p->dev, strerror(errno));
00757    
00758 }
00759 
00760 static struct ast_modem_pvt *mkif(char *iface)
00761 {
00762    /* Make a ast_modem_pvt structure for this interface */
00763    struct ast_modem_pvt *tmp;
00764 #if 0
00765    int flags;  
00766 #endif
00767    
00768    tmp = malloc(sizeof(struct ast_modem_pvt));
00769    if (tmp) {
00770       memset(tmp, 0, sizeof(struct ast_modem_pvt));
00771       tmp->fd = open(iface, O_RDWR | O_NONBLOCK);
00772       if (tmp->fd < 0) {
00773          ast_log(LOG_WARNING, "Unable to open '%s'\n", iface);
00774          free(tmp);
00775          return NULL;
00776       }
00777       strncpy(tmp->language, language, sizeof(tmp->language)-1);
00778       strncpy(tmp->msn, msn, sizeof(tmp->msn)-1);
00779       strncpy(tmp->incomingmsn, incomingmsn, sizeof(tmp->incomingmsn)-1);
00780       tmp->dtmfmode = dtmfmode;
00781       tmp->dtmfmodegen = dtmfmodegen;
00782       snprintf(tmp->outgoingmsn, sizeof(tmp->outgoingmsn), ",%s,", outgoingmsn);
00783       strncpy(tmp->dev, iface, sizeof(tmp->dev)-1);
00784       /* Maybe in the future we want to allow variable
00785          serial settings */
00786       stty(tmp);
00787       tmp->f = fdopen(tmp->fd, "w+");
00788       /* Disable buffering */
00789       setvbuf(tmp->f, NULL, _IONBF,0);
00790       if (tmp->f < 0) {
00791          ast_log(LOG_WARNING, "Unable to fdopen '%s'\n", iface);
00792          free(tmp);
00793          return NULL;
00794       }
00795       tmp->owner = NULL;
00796       tmp->ministate = 0;
00797       tmp->stripmsd = stripmsd;
00798       tmp->dialtype = dialtype;
00799       tmp->mode = gmode;
00800       tmp->group = cur_group;
00801       memset(tmp->cid_num, 0, sizeof(tmp->cid_num));
00802       memset(tmp->cid_name, 0, sizeof(tmp->cid_name));
00803       strncpy(tmp->context, context, sizeof(tmp->context)-1);
00804       strncpy(tmp->initstr, initstr, sizeof(tmp->initstr)-1);
00805       tmp->next = NULL;
00806       tmp->obuflen = 0;
00807       
00808       if (modem_setup(tmp, baudrate) < 0) {
00809          ast_log(LOG_WARNING, "Unable to configure modem '%s'\n", iface);
00810          free(tmp);
00811          return NULL;
00812       }
00813    }
00814    return tmp;
00815 }
00816 
00817 static struct ast_channel *modem_request(const char *type, int format, void *data, int *cause)
00818 {
00819    int oldformat;
00820    struct ast_modem_pvt *p;
00821    struct ast_channel *tmp = NULL;
00822    char dev[80];
00823    ast_group_t group = 0;
00824    int groupint;
00825    char *stringp=NULL;
00826    strncpy(dev, (char *)data, sizeof(dev)-1);
00827    stringp=dev;
00828    strsep(&stringp, ":");
00829    oldformat = format;
00830 
00831    if (!dep_warning) {
00832       ast_log(LOG_WARNING, "This channel driver is deprecated.  Please see the UPGRADE.txt file.\n");
00833       dep_warning = 1;
00834    }
00835 
00836    if (dev[0]=='g' && isdigit(dev[1])) {
00837       /* Retrieve the group number */
00838       if (sscanf(dev+1, "%30u", &groupint) < 1) {
00839          ast_log(LOG_WARNING, "Unable to determine group from [%s]\n", (char *)data);
00840          return NULL;
00841       }
00842       group = 1 << groupint;
00843    }
00844 
00845    /* Search for an unowned channel */
00846    if (ast_mutex_lock(&iflock)) {
00847       ast_log(LOG_ERROR, "Unable to lock interface list???\n");
00848       return NULL;
00849    }
00850    p = iflist;
00851    while(p) {
00852       if (group) {
00853          /* if it belongs to the proper group, and the format matches
00854           * and it is not in use, we found a candidate! */
00855          if (p->group & group &&
00856              p->mc->formats & format &&
00857              !p->owner) {
00858             /* XXX Not quite sure that not having an owner is
00859              * sufficient evidence of beeing a free device XXX */
00860             tmp = ast_modem_new(p, AST_STATE_DOWN);
00861             restart_monitor();
00862             break;
00863          }
00864       } else {
00865          if (!strcmp(dev, p->dev + 5)) {
00866             if (p->mc->formats & format) {
00867                if (!p->owner) {
00868                   tmp = ast_modem_new(p, AST_STATE_DOWN);
00869                   restart_monitor();
00870                   break;
00871                } else
00872                   ast_log(LOG_WARNING, "Device '%s' is busy\n", p->dev);
00873             } else 
00874                ast_log(LOG_WARNING, "Asked for a format %s line on %s\n", ast_getformatname(format), p->dev);
00875             break;
00876          }
00877       }
00878       p = p->next;
00879    }
00880    if (!p) 
00881       ast_log(LOG_WARNING, "Requested device '%s' does not exist\n", dev);
00882    
00883    ast_mutex_unlock(&iflock);
00884    return tmp;
00885 }
00886 
00887 static ast_group_t get_group(char *s)
00888 {
00889    char *piece;
00890    int start, finish,x;
00891    ast_group_t group = 0;
00892    char *copy = ast_strdupa(s);
00893    char *stringp=NULL;
00894    if (!copy) {
00895       ast_log(LOG_ERROR, "Out of memory\n");
00896       return 0;
00897    }
00898    stringp=copy;
00899    piece = strsep(&stringp, ",");
00900    while(piece) {
00901       if (sscanf(piece, "%30d-%30d", &start, &finish) == 2) {
00902          /* Range */
00903       } else if (sscanf(piece, "%30d", &start)) {
00904          /* Just one */
00905          finish = start;
00906       } else {
00907          ast_log(LOG_ERROR, "Syntax error parsing '%s' at '%s'.  Using '0'\n", s,piece);
00908          return 0;
00909       }
00910       piece = strsep(&stringp, ",");
00911 
00912       for (x=start;x<=finish;x++) {
00913          if ((x > 63) || (x < 0)) {
00914             ast_log(LOG_WARNING, "Ignoring invalid group %d\n", x);
00915             break;
00916          }
00917          group |= (1 << x);
00918       }
00919    }
00920    return group;
00921 }
00922 
00923 static int __unload_module(void)
00924 {
00925    struct ast_modem_pvt *p, *pl;
00926    /* First, take us out of the channel loop */
00927    ast_channel_unregister(&modem_tech);
00928    if (!ast_mutex_lock(&iflock)) {
00929       /* Hangup all interfaces if they have an owner */
00930       p = iflist;
00931       while(p) {
00932          if (p->owner)
00933             ast_softhangup(p->owner, AST_SOFTHANGUP_APPUNLOAD);
00934          p = p->next;
00935       }
00936       iflist = NULL;
00937       ast_mutex_unlock(&iflock);
00938    } else {
00939       ast_log(LOG_WARNING, "Unable to lock the monitor\n");
00940       return -1;
00941    }
00942    if (!ast_mutex_lock(&monlock)) {
00943       if (monitor_thread != AST_PTHREADT_NULL && monitor_thread != AST_PTHREADT_STOP) {
00944          pthread_cancel(monitor_thread);
00945          pthread_join(monitor_thread, NULL);
00946       }
00947       monitor_thread = AST_PTHREADT_STOP;
00948       ast_mutex_unlock(&monlock);
00949    } else {
00950       ast_log(LOG_WARNING, "Unable to lock the monitor\n");
00951       return -1;
00952    }
00953 
00954    if (!ast_mutex_lock(&iflock)) {
00955       /* Destroy all the interfaces and free their memory */
00956       p = iflist;
00957       while(p) {
00958          /* Close the socket, assuming it's real */
00959          if (p->fd > -1)
00960             close(p->fd);
00961          pl = p;
00962          p = p->next;
00963          /* Free associated memory */
00964          free(pl);
00965       }
00966       iflist = NULL;
00967       ast_mutex_unlock(&iflock);
00968    } else {
00969       ast_log(LOG_WARNING, "Unable to lock the monitor\n");
00970       return -1;
00971    }
00972       
00973    return 0;
00974 }
00975 
00976 int unload_module()
00977 {
00978    return __unload_module();
00979 }
00980 
00981 int load_module()
00982 {
00983    struct ast_config *cfg;
00984    struct ast_variable *v;
00985    struct ast_modem_pvt *tmp;
00986    char driver[80];
00987    cfg = ast_config_load(config);
00988 
00989    /* We *must* have a config file otherwise stop immediately */
00990    if (!cfg) {
00991       ast_log(LOG_ERROR, "Unable to load config %s\n", config);
00992       return -1;
00993    }
00994    if (ast_mutex_lock(&iflock)) {
00995       /* It's a little silly to lock it, but we mind as well just to be sure */
00996       ast_log(LOG_ERROR, "Unable to lock interface list???\n");
00997       return -1;
00998    }
00999    v = ast_variable_browse(cfg, "interfaces");
01000    while(v) {
01001       /* Create the interface list */
01002       if (!strcasecmp(v->name, "device")) {
01003             tmp = mkif(v->value);
01004             if (tmp) {
01005                tmp->next = iflist;
01006                iflist = tmp;
01007                
01008             } else {
01009                ast_log(LOG_ERROR, "Unable to register channel '%s'\n", v->value);
01010                ast_config_destroy(cfg);
01011                ast_mutex_unlock(&iflock);
01012                __unload_module();
01013                return -1;
01014             }
01015       } else if (!strcasecmp(v->name, "driver")) {
01016          snprintf(driver, sizeof(driver), "chan_modem_%s.so", v->value);
01017          if (option_verbose > 1) 
01018             ast_verbose(VERBOSE_PREFIX_2 "Loading modem driver %s", driver);
01019             
01020          if (ast_load_resource(driver)) {
01021             ast_log(LOG_ERROR, "Failed to load driver %s\n", driver);
01022             ast_config_destroy(cfg);
01023             ast_mutex_unlock(&iflock);
01024             __unload_module();
01025             return -1;
01026          }
01027       } else if (!strcasecmp(v->name, "mode")) {
01028          if (!strncasecmp(v->value, "ri", 2)) 
01029             gmode = MODEM_MODE_WAIT_RING;
01030          else if (!strncasecmp(v->value, "im", 2))
01031             gmode = MODEM_MODE_IMMEDIATE;
01032          else if (!strncasecmp(v->value, "an", 2))
01033             gmode = MODEM_MODE_WAIT_ANSWER;
01034          else
01035             ast_log(LOG_WARNING, "Unknown mode: %s\n", v->value);
01036       } else if (!strcasecmp(v->name, "stripmsd")) {
01037          stripmsd = atoi(v->value);
01038       } else if (!strcasecmp(v->name, "type")) {
01039          strncpy(mtype, v->value, sizeof(mtype)-1);
01040       } else if (!strcasecmp(v->name, "initstr")) {
01041          strncpy(initstr, v->value, sizeof(initstr)-1);
01042       } else if (!strcasecmp(v->name, "dialtype")) {
01043          dialtype = toupper(v->value[0]);
01044       } else if (!strcasecmp(v->name, "context")) {
01045          strncpy(context, v->value, sizeof(context)-1);
01046       } else if (!strcasecmp(v->name, "msn")) {
01047          strncpy(msn, v->value, sizeof(msn)-1);
01048       } else if (!strcasecmp(v->name, "incomingmsn")) {
01049          strncpy(incomingmsn, v->value, sizeof(incomingmsn)-1);
01050       } else if (!strcasecmp(v->name, "dtmfmode")) {
01051          char tmp[80];
01052          char *alt;
01053          strncpy(tmp, v->value, sizeof(tmp) - 1);
01054          alt = strchr(tmp, '/');
01055          if (!strcasecmp(tmp, "none"))
01056             dtmfmode=MODEM_DTMF_NONE;
01057          else if (!strcasecmp(tmp, "asterisk"))
01058             dtmfmode = MODEM_DTMF_AST;
01059          else if (!strcasecmp(tmp, "i4l"))
01060             dtmfmode = MODEM_DTMF_I4L;
01061          else {
01062             ast_log(LOG_WARNING, "Unknown dtmf detection mode '%s', using 'asterisk'\n", v->value);
01063             dtmfmode = MODEM_DTMF_AST;
01064          }
01065          if (alt) {
01066             if (!strcasecmp(alt, "none"))
01067                dtmfmodegen=MODEM_DTMF_NONE;
01068             else if (!strcasecmp(alt, "asterisk"))
01069                dtmfmodegen = MODEM_DTMF_AST;
01070             else if (!strcasecmp(alt, "i4l"))
01071                dtmfmodegen = MODEM_DTMF_I4L;
01072             else if (!strcasecmp(alt, "both"))
01073                dtmfmodegen = MODEM_DTMF_I4L | MODEM_DTMF_AST;
01074             else {
01075                ast_log(LOG_WARNING, "Unknown dtmf generation mode '%s', using 'asterisk'\n", v->value);
01076                dtmfmodegen = MODEM_DTMF_AST;
01077             }
01078          } else
01079             dtmfmodegen = dtmfmode;
01080       } else if (!strcasecmp(v->name, "outgoingmsn")) {
01081          strncpy(outgoingmsn, v->value, sizeof(outgoingmsn)-1);
01082       } else if (!strcasecmp(v->name, "language")) {
01083          strncpy(language, v->value, sizeof(language)-1);
01084       } else if (!strcasecmp(v->name, "group")) {
01085          cur_group = get_group(v->value);
01086       }
01087       v = v->next;
01088    }
01089    ast_mutex_unlock(&iflock);
01090    if (ast_channel_register(&modem_tech)) {
01091       ast_log(LOG_ERROR, "Unable to register channel class %s\n", type);
01092       ast_config_destroy(cfg);
01093       __unload_module();
01094       return -1;
01095    }
01096    ast_config_destroy(cfg);
01097    /* And start the monitor for the first time */
01098    restart_monitor();
01099    return 0;
01100 }
01101 
01102 int usecount(void)
01103 {
01104    return usecnt;
01105 }
01106 
01107 char *description()
01108 {
01109    return (char *) desc;
01110 }
01111 
01112 char *key()
01113 {
01114    return ASTERISK_GPL_KEY;
01115 }
01116 

Generated on Wed Oct 28 15:47:51 2009 for Asterisk - the Open Source PBX by  doxygen 1.5.6