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00038 #include "asterisk.h"
00039
00040 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 137055 $")
00041
00042 #include <dahdi/user.h>
00043
00044 #include "asterisk/lock.h"
00045 #include "asterisk/file.h"
00046 #include "asterisk/channel.h"
00047 #include "asterisk/pbx.h"
00048 #include "asterisk/module.h"
00049 #include "asterisk/config.h"
00050 #include "asterisk/app.h"
00051 #include "asterisk/cli.h"
00052 #include "asterisk/say.h"
00053 #include "asterisk/utils.h"
00054
00055 static char *app = "DAHDIBarge";
00056
00057 static char *synopsis = "Barge in (monitor) DAHDI channel";
00058
00059 static char *descrip =
00060 " DAHDIBarge([channel]): Barges in on a specified DAHDI\n"
00061 "channel or prompts if one is not specified. Returns\n"
00062 "-1 when caller user hangs up and is independent of the\n"
00063 "state of the channel being monitored.";
00064
00065
00066 #define CONF_SIZE 160
00067
00068 static int careful_write(int fd, unsigned char *data, int len)
00069 {
00070 int res;
00071 while(len) {
00072 res = write(fd, data, len);
00073 if (res < 1) {
00074 if (errno != EAGAIN) {
00075 ast_log(LOG_WARNING, "Failed to write audio data to conference: %s\n", strerror(errno));
00076 return -1;
00077 } else
00078 return 0;
00079 }
00080 len -= res;
00081 data += res;
00082 }
00083 return 0;
00084 }
00085
00086 static int conf_run(struct ast_channel *chan, int confno, int confflags)
00087 {
00088 int fd;
00089 struct dahdi_confinfo dahdic;
00090 struct ast_frame *f;
00091 struct ast_channel *c;
00092 struct ast_frame fr;
00093 int outfd;
00094 int ms;
00095 int nfds;
00096 int res;
00097 int flags;
00098 int retrydahdi;
00099 int origfd;
00100 int ret = -1;
00101
00102 struct dahdi_bufferinfo bi;
00103 char __buf[CONF_SIZE + AST_FRIENDLY_OFFSET];
00104 char *buf = __buf + AST_FRIENDLY_OFFSET;
00105
00106
00107 if (ast_set_write_format(chan, AST_FORMAT_ULAW) < 0) {
00108 ast_log(LOG_WARNING, "Unable to set '%s' to write ulaw mode\n", chan->name);
00109 goto outrun;
00110 }
00111
00112
00113 if (ast_set_read_format(chan, AST_FORMAT_ULAW) < 0) {
00114 ast_log(LOG_WARNING, "Unable to set '%s' to read ulaw mode\n", chan->name);
00115 goto outrun;
00116 }
00117 ast_indicate(chan, -1);
00118 retrydahdi = strcasecmp(chan->tech->type, "DAHDI");
00119 dahdiretry:
00120 origfd = chan->fds[0];
00121 if (retrydahdi) {
00122 fd = open("/dev/dahdi/pseudo", O_RDWR);
00123 if (fd < 0) {
00124 ast_log(LOG_WARNING, "Unable to open pseudo channel: %s\n", strerror(errno));
00125 goto outrun;
00126 }
00127
00128 flags = fcntl(fd, F_GETFL);
00129 if (flags < 0) {
00130 ast_log(LOG_WARNING, "Unable to get flags: %s\n", strerror(errno));
00131 close(fd);
00132 goto outrun;
00133 }
00134 if (fcntl(fd, F_SETFL, flags | O_NONBLOCK)) {
00135 ast_log(LOG_WARNING, "Unable to set flags: %s\n", strerror(errno));
00136 close(fd);
00137 goto outrun;
00138 }
00139
00140 memset(&bi, 0, sizeof(bi));
00141 bi.bufsize = CONF_SIZE;
00142 bi.txbufpolicy = DAHDI_POLICY_IMMEDIATE;
00143 bi.rxbufpolicy = DAHDI_POLICY_IMMEDIATE;
00144 bi.numbufs = 4;
00145 if (ioctl(fd, DAHDI_SET_BUFINFO, &bi)) {
00146 ast_log(LOG_WARNING, "Unable to set buffering information: %s\n", strerror(errno));
00147 close(fd);
00148 goto outrun;
00149 }
00150 nfds = 1;
00151 } else {
00152
00153 fd = chan->fds[0];
00154 nfds = 0;
00155 }
00156 memset(&dahdic, 0, sizeof(dahdic));
00157
00158 dahdic.chan = 0;
00159 if (ioctl(fd, DAHDI_GETCONF, &dahdic)) {
00160 ast_log(LOG_WARNING, "Error getting conference\n");
00161 close(fd);
00162 goto outrun;
00163 }
00164 if (dahdic.confmode) {
00165
00166 if (!retrydahdi) {
00167 ast_debug(1, "DAHDI channel is in a conference already, retrying with pseudo\n");
00168 retrydahdi = 1;
00169 goto dahdiretry;
00170 }
00171 }
00172 memset(&dahdic, 0, sizeof(dahdic));
00173
00174 dahdic.chan = 0;
00175 dahdic.confno = confno;
00176 dahdic.confmode = DAHDI_CONF_MONITORBOTH;
00177
00178 if (ioctl(fd, DAHDI_SETCONF, &dahdic)) {
00179 ast_log(LOG_WARNING, "Error setting conference\n");
00180 close(fd);
00181 goto outrun;
00182 }
00183 ast_debug(1, "Placed channel %s in DAHDI channel %d monitor\n", chan->name, confno);
00184
00185 for(;;) {
00186 outfd = -1;
00187 ms = -1;
00188 c = ast_waitfor_nandfds(&chan, 1, &fd, nfds, NULL, &outfd, &ms);
00189 if (c) {
00190 if (c->fds[0] != origfd) {
00191 if (retrydahdi) {
00192
00193 close(fd);
00194 }
00195 ast_debug(1, "Ooh, something swapped out under us, starting over\n");
00196 retrydahdi = 0;
00197 goto dahdiretry;
00198 }
00199 f = ast_read(c);
00200 if (!f)
00201 break;
00202 if ((f->frametype == AST_FRAME_DTMF) && (f->subclass == '#')) {
00203 ret = 0;
00204 ast_frfree(f);
00205 break;
00206 } else if (fd != chan->fds[0]) {
00207 if (f->frametype == AST_FRAME_VOICE) {
00208 if (f->subclass == AST_FORMAT_ULAW) {
00209
00210 careful_write(fd, f->data.ptr, f->datalen);
00211 } else
00212 ast_log(LOG_WARNING, "Huh? Got a non-ulaw (%d) frame in the conference\n", f->subclass);
00213 }
00214 }
00215 ast_frfree(f);
00216 } else if (outfd > -1) {
00217 res = read(outfd, buf, CONF_SIZE);
00218 if (res > 0) {
00219 memset(&fr, 0, sizeof(fr));
00220 fr.frametype = AST_FRAME_VOICE;
00221 fr.subclass = AST_FORMAT_ULAW;
00222 fr.datalen = res;
00223 fr.samples = res;
00224 fr.data.ptr = buf;
00225 fr.offset = AST_FRIENDLY_OFFSET;
00226 if (ast_write(chan, &fr) < 0) {
00227 ast_log(LOG_WARNING, "Unable to write frame to channel: %s\n", strerror(errno));
00228
00229 }
00230 } else
00231 ast_log(LOG_WARNING, "Failed to read frame: %s\n", strerror(errno));
00232 }
00233 }
00234 if (fd != chan->fds[0])
00235 close(fd);
00236 else {
00237
00238
00239 dahdic.chan = 0;
00240 dahdic.confno = 0;
00241 dahdic.confmode = 0;
00242 if (ioctl(fd, DAHDI_SETCONF, &dahdic)) {
00243 ast_log(LOG_WARNING, "Error setting conference\n");
00244 }
00245 }
00246
00247 outrun:
00248
00249 return ret;
00250 }
00251
00252 static int conf_exec(struct ast_channel *chan, void *data)
00253 {
00254 int res = -1;
00255 int retrycnt = 0;
00256 int confflags = 0;
00257 int confno = 0;
00258 char confnostr[80] = "";
00259
00260 if (!ast_strlen_zero(data)) {
00261 if ((sscanf(data, "DAHDI/%d", &confno) != 1) &&
00262 (sscanf(data, "%d", &confno) != 1)) {
00263 ast_log(LOG_WARNING, "DAHDIBarge Argument (if specified) must be a channel number, not '%s'\n", (char *)data);
00264 return 0;
00265 }
00266 }
00267
00268 if (chan->_state != AST_STATE_UP)
00269 ast_answer(chan);
00270
00271 while(!confno && (++retrycnt < 4)) {
00272
00273 confnostr[0] = '\0';
00274 res = ast_app_getdata(chan, "conf-getchannel",confnostr, sizeof(confnostr) - 1, 0);
00275 if (res <0) goto out;
00276 if (sscanf(confnostr, "%d", &confno) != 1)
00277 confno = 0;
00278 }
00279 if (confno) {
00280
00281
00282 res = conf_run(chan, confno, confflags);
00283 }
00284 out:
00285
00286 return res;
00287 }
00288
00289 static int unload_module(void)
00290 {
00291 return ast_unregister_application(app);
00292 }
00293
00294 static int load_module(void)
00295 {
00296 return ((ast_register_application(app, conf_exec, synopsis, descrip)) ? AST_MODULE_LOAD_FAILURE : AST_MODULE_LOAD_SUCCESS);
00297 }
00298
00299 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Barge in on DAHDI channel application");