Sat Mar 24 23:26:01 2007

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: 9404 $")
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   0
00358       fprintf(stderr, "Modem said: %s", p->response);
00359 #endif
00360       if (!strncasecmp(p->response, result, strlen(result))) 
00361          return 0;
00362    } while(timeout > 0);
00363    return -1;
00364 }
00365 
00366 void ast_modem_trim(char *s)
00367 {
00368    int x;
00369    x = strlen(s) - 1;
00370    while(x >= 0) {
00371       if ((s[x] != '\r') && (s[x] != '\n') && (s[x] != ' '))
00372          break;
00373       s[x] = '\0';
00374       x--;
00375    }
00376 }
00377 
00378 static int modem_setup(struct ast_modem_pvt *p, int baudrate)
00379 {
00380 
00381    /* Make sure there's a modem there and that it's in a reasonable 
00382       mode.  Set the baud rate, etc.  */
00383    char identity[256];
00384    char *ident = NULL;
00385    char etx[2] = { 0x10, '!' }; 
00386    if (option_debug)
00387       ast_log(LOG_DEBUG, "Setting up modem %s\n", p->dev);
00388    if (ast_modem_send(p, etx, 2)) {
00389       ast_log(LOG_WARNING, "Failed to send ETX?\n");
00390       return -1;
00391    }
00392    if (ast_modem_send(p, "\r\n", 2)) {
00393       ast_log(LOG_WARNING, "Failed to send enter?\n");
00394       return -1;
00395    }
00396    usleep(10000);
00397    /* Read any outstanding stuff */
00398    while(!ast_modem_read_response(p, 0));
00399    if (ast_modem_send(p, "ATZ", 0)) {
00400       ast_log(LOG_WARNING, "Modem not responding on %s\n", p->dev);
00401       return -1;
00402    }
00403    if (ast_modem_expect(p, "OK", ECHO_TIMEOUT)) {
00404       ast_log(LOG_WARNING, "Modem reset failed: %s\n", p->response);
00405       return -1;
00406    }
00407    if (ast_modem_send(p, p->initstr, 0)) {
00408       ast_log(LOG_WARNING, "Modem not responding on %s\n", p->dev);
00409       return -1;
00410    }
00411    if (ast_modem_expect(p, "OK", ECHO_TIMEOUT)) {
00412       ast_log(LOG_WARNING, "Modem initialization failed: %s\n", p->response);
00413       return -1;
00414    }
00415    if (ast_modem_send(p, "ATI3", 0)) {
00416       ast_log(LOG_WARNING, "Modem not responding on %s\n", p->dev);
00417       return -1;
00418    }
00419    if (ast_modem_read_response(p, ECHO_TIMEOUT)) {
00420       ast_log(LOG_WARNING, "Modem did not provide identification\n");
00421       return -1;
00422    }
00423    strncpy(identity, p->response, sizeof(identity)-1);
00424    ast_modem_trim(identity);
00425    if (ast_modem_expect(p, "OK", ECHO_TIMEOUT)) {
00426       ast_log(LOG_WARNING, "Modem did not provide identification\n");
00427       return -1;
00428    }
00429    if (!strcasecmp(mtype, "autodetect")) {
00430       p->mc = find_capability(identity);
00431       if (!p->mc) {
00432          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); 
00433          return -1;
00434       }
00435    } else {
00436       p->mc = find_driver(mtype);
00437       if (!p->mc) {
00438          ast_log(LOG_WARNING, "No driver for modem type '%s'\n", mtype);
00439          return -1;
00440       }
00441    }
00442    if (p->mc->init) {
00443       if (p->mc->init(p)) {
00444          ast_log(LOG_WARNING, "Modem Initialization Failed on '%s', driver %s.\n", p->dev, p->mc->name);
00445          p->mc->decusecnt();
00446          return -1;
00447       }
00448    }        
00449    if (option_verbose > 2) {
00450       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");
00451    }
00452    if (ident)
00453       free(ident);
00454    return 0;
00455 }
00456 
00457 static int modem_hangup(struct ast_channel *ast)
00458 {
00459    struct ast_modem_pvt *p;
00460    if (option_debug)
00461       ast_log(LOG_DEBUG, "modem_hangup(%s)\n", ast->name);
00462    p = ast->tech_pvt;
00463    /* Hang up */
00464    if (p->mc->hangup)
00465       p->mc->hangup(p);
00466    /* Re-initialize */
00467    if (p->mc->init)
00468       p->mc->init(p);
00469    ast_setstate(ast, AST_STATE_DOWN);
00470    memset(p->cid_num, 0, sizeof(p->cid_num));
00471    memset(p->cid_name, 0, sizeof(p->cid_name));
00472    memset(p->dnid, 0, sizeof(p->dnid));
00473    ((struct ast_modem_pvt *)(ast->tech_pvt))->owner = NULL;
00474    ast_mutex_lock(&usecnt_lock);
00475    usecnt--;
00476    if (usecnt < 0) 
00477       ast_log(LOG_WARNING, "Usecnt < 0???\n");
00478    ast_mutex_unlock(&usecnt_lock);
00479    ast_update_use_count();
00480    if (option_verbose > 2) 
00481       ast_verbose( VERBOSE_PREFIX_3 "Hungup '%s'\n", ast->name);
00482    ast->tech_pvt = NULL;
00483    ast_setstate(ast, AST_STATE_DOWN);
00484    restart_monitor();
00485    return 0;
00486 }
00487 
00488 static int modem_answer(struct ast_channel *ast)
00489 {
00490    struct ast_modem_pvt *p;
00491    int res=0;
00492    if (option_debug)
00493       ast_log(LOG_DEBUG, "modem_answer(%s)\n", ast->name);
00494    p = ast->tech_pvt;
00495    if (p->mc->answer) {
00496       res = p->mc->answer(p);
00497    }
00498    if (!res) {
00499       ast->rings = 0;
00500       ast_setstate(ast, AST_STATE_UP);
00501    }
00502    return res;
00503 }
00504 
00505 #if   0
00506 static char modem_2digit(char c)
00507 {
00508    if (c == 12)
00509       return '#';
00510    else if (c == 11)
00511       return '*';
00512    else if ((c < 10) && (c >= 0))
00513       return '0' + c - 1;
00514    else
00515       return '?';
00516 }
00517 #endif
00518 static struct ast_frame *modem_read(struct ast_channel *ast)
00519 {
00520    struct ast_modem_pvt *p = ast->tech_pvt;
00521    struct ast_frame *fr=NULL;
00522    if (p->mc->read)
00523       fr = p->mc->read(p);
00524    return fr;
00525 }
00526 
00527 static int modem_write(struct ast_channel *ast, struct ast_frame *frame)
00528 {
00529    int res=0;
00530    long flags;
00531    struct ast_modem_pvt *p = ast->tech_pvt;
00532 
00533    /* Modems tend to get upset when they receive data whilst in
00534     * command mode. This makes esp. dial commands short lived.
00535     *     Pauline Middelink - 2002-09-24 */
00536    if (ast->_state != AST_STATE_UP)
00537       return 0;
00538 
00539    /* Temporarily make non-blocking */
00540    flags = fcntl(ast->fds[0], F_GETFL);
00541    fcntl(ast->fds[0], F_SETFL, flags | O_NONBLOCK);
00542 
00543    if (p->mc->write)
00544       res = p->mc->write(p, frame);
00545 
00546    /* Block again */
00547    fcntl(ast->fds[0], F_SETFL, flags);
00548    return res;
00549 }
00550 
00551 static int modem_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
00552 {
00553         struct ast_modem_pvt *p = newchan->tech_pvt;
00554 ast_log(LOG_WARNING, "fixup called\n");
00555    if (p->owner!=oldchan) {
00556        ast_log(LOG_WARNING, "old channel wasn't %p but was %p\n",oldchan,p->owner);
00557        return -1;
00558    }
00559    p->owner = newchan;
00560         return 0; 
00561 }
00562 
00563 struct ast_channel *ast_modem_new(struct ast_modem_pvt *i, int state)
00564 {
00565    struct ast_channel *tmp;
00566    tmp = ast_channel_alloc(1);
00567    if (tmp) {
00568       tmp->tech = &modem_tech;
00569       snprintf(tmp->name, sizeof(tmp->name), "Modem[%s]/%s", i->mc->name, i->dev + 5);
00570       tmp->type = type;
00571       tmp->fds[0] = i->fd;
00572       tmp->nativeformats = i->mc->formats;
00573       ast_setstate(tmp, state);
00574       if (state == AST_STATE_RING)
00575          tmp->rings = 1;
00576       tmp->tech_pvt = i;
00577       strncpy(tmp->context, i->context, sizeof(tmp->context)-1);
00578 
00579       if (!ast_strlen_zero(i->cid_num))
00580          tmp->cid.cid_num = strdup(i->cid_num);
00581       if (!ast_strlen_zero(i->cid_name))
00582          tmp->cid.cid_name = strdup(i->cid_name);
00583 
00584       if (!ast_strlen_zero(i->language))
00585          strncpy(tmp->language,i->language, sizeof(tmp->language)-1);
00586       if (!ast_strlen_zero(i->dnid))
00587          strncpy(tmp->exten, i->dnid, sizeof(tmp->exten) - 1);
00588       i->owner = tmp;
00589       ast_mutex_lock(&usecnt_lock);
00590       usecnt++;
00591       ast_mutex_unlock(&usecnt_lock);
00592       ast_update_use_count();
00593       if (state != AST_STATE_DOWN) {
00594          if (ast_pbx_start(tmp)) {
00595             ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
00596             ast_hangup(tmp);
00597             tmp = NULL;
00598          }
00599       }
00600    } else
00601       ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
00602    return tmp;
00603 }
00604 
00605 static void modem_mini_packet(struct ast_modem_pvt *i)
00606 {
00607    struct ast_frame *fr;
00608    fr = i->mc->read(i);
00609    if (!fr) return;
00610    if (fr->frametype == AST_FRAME_CONTROL) {
00611       if (fr->subclass == AST_CONTROL_RING) {
00612          ast_modem_new(i, AST_STATE_RING);
00613       }
00614    }
00615 }
00616 
00617 static void *do_monitor(void *data)
00618 {
00619    fd_set rfds, efds;
00620    int n, res;
00621    struct ast_modem_pvt *i;
00622    /* This thread monitors all the frame relay interfaces which are not yet in use
00623       (and thus do not have a separate thread) indefinitely */
00624    /* From here on out, we die whenever asked */
00625 #if 0
00626    if (pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL)) {
00627       ast_log(LOG_WARNING, "Unable to set cancel type to asynchronous\n");
00628       return NULL;
00629    }
00630 #endif
00631    for(;;) {
00632       /* Don't let anybody kill us right away.  Nobody should lock the interface list
00633          and wait for the monitor list, but the other way around is okay. */
00634       if (ast_mutex_lock(&monlock)) {
00635          ast_log(LOG_ERROR, "Unable to grab monitor lock\n");
00636          return NULL;
00637       }
00638       /* Lock the interface list */
00639       if (ast_mutex_lock(&iflock)) {
00640          ast_log(LOG_ERROR, "Unable to grab interface lock\n");
00641          ast_mutex_unlock(&monlock);
00642          return NULL;
00643       }
00644       /* Build the stuff we're going to select on, that is the socket of every
00645          ast_modem_pvt that does not have an associated owner channel */
00646       n = -1;
00647       FD_ZERO(&rfds);
00648       FD_ZERO(&efds);
00649       i = iflist;
00650       while(i) {
00651          if (FD_ISSET(i->fd, &rfds)) 
00652             ast_log(LOG_WARNING, "Descriptor %d appears twice (%s)?\n", i->fd, i->dev);
00653          if (!i->owner) {
00654             /* This needs to be watched, as it lacks an owner */
00655             FD_SET(i->fd, &rfds);
00656             FD_SET(i->fd, &efds);
00657             if (i->fd > n)
00658                n = i->fd;
00659          }
00660          
00661          i = i->next;
00662       }
00663       /* Okay, now that we know what to do, release the interface lock */
00664       ast_mutex_unlock(&iflock);
00665       
00666       /* And from now on, we're okay to be killed, so release the monitor lock as well */
00667       ast_mutex_unlock(&monlock);
00668 #if 0
00669       ast_log(LOG_DEBUG, "In monitor, n=%d, pid=%d\n", n, getpid());
00670 #endif
00671       /* Wait indefinitely for something to happen */
00672       pthread_testcancel();
00673       res = ast_select(n + 1, &rfds, NULL, &efds, NULL);
00674       pthread_testcancel();
00675       /* Okay, select has finished.  Let's see what happened.  */
00676       if (res < 1) {
00677          if ((errno != EINTR) && (errno != EAGAIN))
00678             ast_log(LOG_WARNING, "select return %d: %s\n", res, strerror(errno));
00679          continue;
00680       }
00681       /* Alright, lock the interface list again, and let's look and see what has
00682          happened */
00683       if (ast_mutex_lock(&iflock)) {
00684          ast_log(LOG_WARNING, "Unable to lock the interface list\n");
00685          continue;
00686       }
00687       i = iflist;
00688       while(i) {
00689          if (FD_ISSET(i->fd, &rfds) || FD_ISSET(i->fd, &efds)) {
00690             if (i->owner) {
00691                ast_log(LOG_WARNING, "Whoa....  I'm owned but found (%d, %s)...\n", i->fd, i->dev);
00692                i = i->next;
00693                continue;
00694             }
00695             modem_mini_packet(i);
00696          }
00697          i=i->next;
00698       }
00699       ast_mutex_unlock(&iflock);
00700    }
00701    /* Never reached */
00702    return NULL;
00703    
00704 }
00705 
00706 static int restart_monitor()
00707 {
00708    /* If we're supposed to be stopped -- stay stopped */
00709    if (monitor_thread == AST_PTHREADT_STOP)
00710       return 0;
00711    if (ast_mutex_lock(&monlock)) {
00712       ast_log(LOG_WARNING, "Unable to lock monitor\n");
00713       return -1;
00714    }
00715    if (monitor_thread == pthread_self()) {
00716       ast_mutex_unlock(&monlock);
00717       ast_log(LOG_WARNING, "Cannot kill myself\n");
00718       return -1;
00719    }
00720    if (monitor_thread != AST_PTHREADT_NULL) {
00721       pthread_kill(monitor_thread, SIGURG);
00722       pthread_join(monitor_thread, NULL);
00723    } else {
00724       /* Start a new monitor */
00725       if (ast_pthread_create(&monitor_thread, NULL, do_monitor, NULL) < 0) {
00726          ast_mutex_unlock(&monlock);
00727          ast_log(LOG_ERROR, "Unable to start monitor thread.\n");
00728          return -1;
00729       }
00730    }
00731    ast_mutex_unlock(&monlock);
00732    return 0;
00733 }
00734 
00735 static void stty(struct ast_modem_pvt *p)
00736 {
00737    struct termios mode;
00738    memset(&mode, 0, sizeof(mode));
00739    if (tcgetattr(p->fd, &mode)) {
00740       ast_log(LOG_WARNING, "Unable to get serial parameters on %s: %s\n", p->dev, strerror(errno));
00741       return;
00742    }
00743 #ifndef SOLARIS
00744    cfmakeraw(&mode);
00745 #else
00746         mode.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
00747                         |INLCR|IGNCR|ICRNL|IXON);
00748         mode.c_oflag &= ~OPOST;
00749         mode.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
00750         mode.c_cflag &= ~(CSIZE|PARENB);
00751         mode.c_cflag |= CS8;
00752 #endif
00753 
00754    cfsetispeed(&mode, B115200);
00755    cfsetospeed(&mode, B115200);
00756    if (tcsetattr(p->fd, TCSANOW, &mode)) 
00757       ast_log(LOG_WARNING, "Unable to set serial parameters on %s: %s\n", p->dev, strerror(errno));
00758    
00759 }
00760 
00761 static struct ast_modem_pvt *mkif(char *iface)
00762 {
00763    /* Make a ast_modem_pvt structure for this interface */
00764    struct ast_modem_pvt *tmp;
00765 #if 0
00766    int flags;  
00767 #endif
00768    
00769    tmp = malloc(sizeof(struct ast_modem_pvt));
00770    if (tmp) {
00771       memset(tmp, 0, sizeof(struct ast_modem_pvt));
00772       tmp->fd = open(iface, O_RDWR | O_NONBLOCK);
00773       if (tmp->fd < 0) {
00774          ast_log(LOG_WARNING, "Unable to open '%s'\n", iface);
00775          free(tmp);
00776          return NULL;
00777       }
00778       strncpy(tmp->language, language, sizeof(tmp->language)-1);
00779       strncpy(tmp->msn, msn, sizeof(tmp->msn)-1);
00780       strncpy(tmp->incomingmsn, incomingmsn, sizeof(tmp->incomingmsn)-1);
00781       tmp->dtmfmode = dtmfmode;
00782       tmp->dtmfmodegen = dtmfmodegen;
00783       snprintf(tmp->outgoingmsn, sizeof(tmp->outgoingmsn), ",%s,", outgoingmsn);
00784       strncpy(tmp->dev, iface, sizeof(tmp->dev)-1);
00785       /* Maybe in the future we want to allow variable
00786          serial settings */
00787       stty(tmp);
00788       tmp->f = fdopen(tmp->fd, "w+");
00789       /* Disable buffering */
00790       setvbuf(tmp->f, NULL, _IONBF,0);
00791       if (tmp->f < 0) {
00792          ast_log(LOG_WARNING, "Unable to fdopen '%s'\n", iface);
00793          free(tmp);
00794          return NULL;
00795       }
00796       tmp->owner = NULL;
00797       tmp->ministate = 0;
00798       tmp->stripmsd = stripmsd;
00799       tmp->dialtype = dialtype;
00800       tmp->mode = gmode;
00801       tmp->group = cur_group;
00802       memset(tmp->cid_num, 0, sizeof(tmp->cid_num));
00803       memset(tmp->cid_name, 0, sizeof(tmp->cid_name));
00804       strncpy(tmp->context, context, sizeof(tmp->context)-1);
00805       strncpy(tmp->initstr, initstr, sizeof(tmp->initstr)-1);
00806       tmp->next = NULL;
00807       tmp->obuflen = 0;
00808       
00809       if (modem_setup(tmp, baudrate) < 0) {
00810          ast_log(LOG_WARNING, "Unable to configure modem '%s'\n", iface);
00811          free(tmp);
00812          return NULL;
00813       }
00814    }
00815    return tmp;
00816 }
00817 
00818 static struct ast_channel *modem_request(const char *type, int format, void *data, int *cause)
00819 {
00820    int oldformat;
00821    struct ast_modem_pvt *p;
00822    struct ast_channel *tmp = NULL;
00823    char dev[80];
00824    ast_group_t group = 0;
00825    int groupint;
00826    char *stringp=NULL;
00827    strncpy(dev, (char *)data, sizeof(dev)-1);
00828    stringp=dev;
00829    strsep(&stringp, ":");
00830    oldformat = format;
00831 
00832    if (!dep_warning) {
00833       ast_log(LOG_WARNING, "This channel driver is deprecated.  Please see the UPGRADE.txt file.\n");
00834       dep_warning = 1;
00835    }
00836 
00837    if (dev[0]=='g' && isdigit(dev[1])) {
00838       /* Retrieve the group number */
00839       if (sscanf(dev+1, "%u", &groupint) < 1) {
00840          ast_log(LOG_WARNING, "Unable to determine group from [%s]\n", (char *)data);
00841          return NULL;
00842       }
00843       group = 1 << groupint;
00844    }
00845 
00846    /* Search for an unowned channel */
00847    if (ast_mutex_lock(&iflock)) {
00848       ast_log(LOG_ERROR, "Unable to lock interface list???\n");
00849       return NULL;
00850    }
00851    p = iflist;
00852    while(p) {
00853       if (group) {
00854          /* if it belongs to the proper group, and the format matches
00855           * and it is not in use, we found a candidate! */
00856          if (p->group & group &&
00857              p->mc->formats & format &&
00858              !p->owner) {
00859             /* XXX Not quite sure that not having an owner is
00860              * sufficient evidence of beeing a free device XXX */
00861             tmp = ast_modem_new(p, AST_STATE_DOWN);
00862             restart_monitor();
00863             break;
00864          }
00865       } else {
00866          if (!strcmp(dev, p->dev + 5)) {
00867             if (p->mc->formats & format) {
00868                if (!p->owner) {
00869                   tmp = ast_modem_new(p, AST_STATE_DOWN);
00870                   restart_monitor();
00871                   break;
00872                } else
00873                   ast_log(LOG_WARNING, "Device '%s' is busy\n", p->dev);
00874             } else 
00875                ast_log(LOG_WARNING, "Asked for a format %s line on %s\n", ast_getformatname(format), p->dev);
00876             break;
00877          }
00878       }
00879       p = p->next;
00880    }
00881    if (!p) 
00882       ast_log(LOG_WARNING, "Requested device '%s' does not exist\n", dev);
00883    
00884    ast_mutex_unlock(&iflock);
00885    return tmp;
00886 }
00887 
00888 static ast_group_t get_group(char *s)
00889 {
00890    char *piece;
00891    int start, finish,x;
00892    ast_group_t group = 0;
00893    char *copy = ast_strdupa(s);
00894    char *stringp=NULL;
00895    if (!copy) {
00896       ast_log(LOG_ERROR, "Out of memory\n");
00897       return 0;
00898    }
00899    stringp=copy;
00900    piece = strsep(&stringp, ",");
00901    while(piece) {
00902       if (sscanf(piece, "%d-%d", &start, &finish) == 2) {
00903          /* Range */
00904       } else if (sscanf(piece, "%d", &start)) {
00905          /* Just one */
00906          finish = start;
00907       } else {
00908          ast_log(LOG_ERROR, "Syntax error parsing '%s' at '%s'.  Using '0'\n", s,piece);
00909          return 0;
00910       }
00911       piece = strsep(&stringp, ",");
00912 
00913       for (x=start;x<=finish;x++) {
00914          if ((x > 63) || (x < 0)) {
00915             ast_log(LOG_WARNING, "Ignoring invalid group %d\n", x);
00916             break;
00917          }
00918          group |= (1 << x);
00919       }
00920    }
00921    return group;
00922 }
00923 
00924 static int __unload_module(void)
00925 {
00926    struct ast_modem_pvt *p, *pl;
00927    /* First, take us out of the channel loop */
00928    ast_channel_unregister(&modem_tech);
00929    if (!ast_mutex_lock(&iflock)) {
00930       /* Hangup all interfaces if they have an owner */
00931       p = iflist;
00932       while(p) {
00933          if (p->owner)
00934             ast_softhangup(p->owner, AST_SOFTHANGUP_APPUNLOAD);
00935          p = p->next;
00936       }
00937       iflist = NULL;
00938       ast_mutex_unlock(&iflock);
00939    } else {
00940       ast_log(LOG_WARNING, "Unable to lock the monitor\n");
00941       return -1;
00942    }
00943    if (!ast_mutex_lock(&monlock)) {
00944       if (monitor_thread != AST_PTHREADT_NULL && monitor_thread != AST_PTHREADT_STOP) {
00945          pthread_cancel(monitor_thread);
00946          pthread_join(monitor_thread, NULL);
00947       }
00948       monitor_thread = AST_PTHREADT_STOP;
00949       ast_mutex_unlock(&monlock);
00950    } else {
00951       ast_log(LOG_WARNING, "Unable to lock the monitor\n");
00952       return -1;
00953    }
00954 
00955    if (!ast_mutex_lock(&iflock)) {
00956       /* Destroy all the interfaces and free their memory */
00957       p = iflist;
00958       while(p) {
00959          /* Close the socket, assuming it's real */
00960          if (p->fd > -1)
00961             close(p->fd);
00962          pl = p;
00963          p = p->next;
00964          /* Free associated memory */
00965          free(pl);
00966       }
00967       iflist = NULL;
00968       ast_mutex_unlock(&iflock);
00969    } else {
00970       ast_log(LOG_WARNING, "Unable to lock the monitor\n");
00971       return -1;
00972    }
00973       
00974    return 0;
00975 }
00976 
00977 int unload_module()
00978 {
00979    return __unload_module();
00980 }
00981 
00982 int load_module()
00983 {
00984    struct ast_config *cfg;
00985    struct ast_variable *v;
00986    struct ast_modem_pvt *tmp;
00987    char driver[80];
00988    cfg = ast_config_load(config);
00989 
00990    /* We *must* have a config file otherwise stop immediately */
00991    if (!cfg) {
00992       ast_log(LOG_ERROR, "Unable to load config %s\n", config);
00993       return -1;
00994    }
00995    if (ast_mutex_lock(&iflock)) {
00996       /* It's a little silly to lock it, but we mind as well just to be sure */
00997       ast_log(LOG_ERROR, "Unable to lock interface list???\n");
00998       return -1;
00999    }
01000    v = ast_variable_browse(cfg, "interfaces");
01001    while(v) {
01002       /* Create the interface list */
01003       if (!strcasecmp(v->name, "device")) {
01004             tmp = mkif(v->value);
01005             if (tmp) {
01006                tmp->next = iflist;
01007                iflist = tmp;
01008                
01009             } else {
01010                ast_log(LOG_ERROR, "Unable to register channel '%s'\n", v->value);
01011                ast_config_destroy(cfg);
01012                ast_mutex_unlock(&iflock);
01013                __unload_module();
01014                return -1;
01015             }
01016       } else if (!strcasecmp(v->name, "driver")) {
01017          snprintf(driver, sizeof(driver), "chan_modem_%s.so", v->value);
01018          if (option_verbose > 1) 
01019             ast_verbose(VERBOSE_PREFIX_2 "Loading modem driver %s", driver);
01020             
01021          if (ast_load_resource(driver)) {
01022             ast_log(LOG_ERROR, "Failed to load driver %s\n", driver);
01023             ast_config_destroy(cfg);
01024             ast_mutex_unlock(&iflock);
01025             __unload_module();
01026             return -1;
01027          }
01028       } else if (!strcasecmp(v->name, "mode")) {
01029          if (!strncasecmp(v->value, "ri", 2)) 
01030             gmode = MODEM_MODE_WAIT_RING;
01031          else if (!strncasecmp(v->value, "im", 2))
01032             gmode = MODEM_MODE_IMMEDIATE;
01033          else if (!strncasecmp(v->value, "an", 2))
01034             gmode = MODEM_MODE_WAIT_ANSWER;
01035          else
01036             ast_log(LOG_WARNING, "Unknown mode: %s\n", v->value);
01037       } else if (!strcasecmp(v->name, "stripmsd")) {
01038          stripmsd = atoi(v->value);
01039       } else if (!strcasecmp(v->name, "type")) {
01040          strncpy(mtype, v->value, sizeof(mtype)-1);
01041       } else if (!strcasecmp(v->name, "initstr")) {
01042          strncpy(initstr, v->value, sizeof(initstr)-1);
01043       } else if (!strcasecmp(v->name, "dialtype")) {
01044          dialtype = toupper(v->value[0]);
01045       } else if (!strcasecmp(v->name, "context")) {
01046          strncpy(context, v->value, sizeof(context)-1);
01047       } else if (!strcasecmp(v->name, "msn")) {
01048          strncpy(msn, v->value, sizeof(msn)-1);
01049       } else if (!strcasecmp(v->name, "incomingmsn")) {
01050          strncpy(incomingmsn, v->value, sizeof(incomingmsn)-1);
01051       } else if (!strcasecmp(v->name, "dtmfmode")) {
01052          char tmp[80];
01053          char *alt;
01054          strncpy(tmp, v->value, sizeof(tmp) - 1);
01055          alt = strchr(tmp, '/');
01056          if (!strcasecmp(tmp, "none"))
01057             dtmfmode=MODEM_DTMF_NONE;
01058          else if (!strcasecmp(tmp, "asterisk"))
01059             dtmfmode = MODEM_DTMF_AST;
01060          else if (!strcasecmp(tmp, "i4l"))
01061             dtmfmode = MODEM_DTMF_I4L;
01062          else {
01063             ast_log(LOG_WARNING, "Unknown dtmf detection mode '%s', using 'asterisk'\n", v->value);
01064             dtmfmode = MODEM_DTMF_AST;
01065          }
01066          if (alt) {
01067             if (!strcasecmp(alt, "none"))
01068                dtmfmodegen=MODEM_DTMF_NONE;
01069             else if (!strcasecmp(alt, "asterisk"))
01070                dtmfmodegen = MODEM_DTMF_AST;
01071             else if (!strcasecmp(alt, "i4l"))
01072                dtmfmodegen = MODEM_DTMF_I4L;
01073             else if (!strcasecmp(alt, "both"))
01074                dtmfmodegen = MODEM_DTMF_I4L | MODEM_DTMF_AST;
01075             else {
01076                ast_log(LOG_WARNING, "Unknown dtmf generation mode '%s', using 'asterisk'\n", v->value);
01077                dtmfmodegen = MODEM_DTMF_AST;
01078             }
01079          } else
01080             dtmfmodegen = dtmfmode;
01081       } else if (!strcasecmp(v->name, "outgoingmsn")) {
01082          strncpy(outgoingmsn, v->value, sizeof(outgoingmsn)-1);
01083       } else if (!strcasecmp(v->name, "language")) {
01084          strncpy(language, v->value, sizeof(language)-1);
01085       } else if (!strcasecmp(v->name, "group")) {
01086          cur_group = get_group(v->value);
01087       }
01088       v = v->next;
01089    }
01090    ast_mutex_unlock(&iflock);
01091    if (ast_channel_register(&modem_tech)) {
01092       ast_log(LOG_ERROR, "Unable to register channel class %s\n", type);
01093       ast_config_destroy(cfg);
01094       __unload_module();
01095       return -1;
01096    }
01097    ast_config_destroy(cfg);
01098    /* And start the monitor for the first time */
01099    restart_monitor();
01100    return 0;
01101 }
01102 
01103 int usecount(void)
01104 {
01105    return usecnt;
01106 }
01107 
01108 char *description()
01109 {
01110    return (char *) desc;
01111 }
01112 
01113 char *key()
01114 {
01115    return ASTERISK_GPL_KEY;
01116 }
01117 

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