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1 /*
2  * Asterisk -- A telephony toolkit for Linux.
3  *
4  * Trivial application to send a TIFF file as a FAX
5  * 
6  * Copyright (C) 2003, Steve Underwood
7  *
8  * Steve Underwood <steveu@coppice.org>
9  *
10  * This program is free software, distributed under the terms of
11  * the GNU General Public License
12  */
13  
14 #include <string.h>
15 #include <stdlib.h>
16 #include <stdio.h>
17 #include <inttypes.h>
18 #include <pthread.h>
19 #include <errno.h>
20 #include <tiffio.h>
21
22 #include <spandsp.h>
23
24 #include "asterisk.h"
25
26 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
27
28 #include "asterisk/lock.h"
29 #include "asterisk/file.h"
30 #include "asterisk/logger.h"
31 #include "asterisk/channel.h"
32 #include "asterisk/pbx.h"
33 #include "asterisk/module.h"
34 #include "asterisk/translate.h"
35
36 static char *tdesc = "Trivial FAX Transmit Application";
37
38 static char *app = "TxFAX";
39
40 static char *synopsis = "Send a FAX file";
41
42 static char *descrip = 
43 "  TxFAX(filename[|caller][|debug]):  Send a given TIFF file to the channel as a FAX.\n"
44 "The \"caller\" option makes the application behave as a calling machine,\n"
45 "rather than the answering machine. The default behaviour is to behave as\n"
46 "an answering machine.\n"
47 "Uses LOCALSTATIONID to identify itself to the remote end.\n"
48 "     LOCALHEADERINFO to generate a header line on each page.\n"
49 "Sets REMOTESTATIONID to the receiver CSID.\n"
50 "Returns -1 when the user hangs up, or if the file does not exist.\n"
51 "Returns 0 otherwise.\n";
52
53 STANDARD_LOCAL_USER;
54
55 LOCAL_USER_DECL;
56
57 #define MAX_BLOCK_SIZE 240
58
59 static void span_message(int level, const char *msg)
60 {
61     int ast_level;
62     
63     if (level == SPAN_LOG_WARNING)
64         ast_level = __LOG_WARNING;
65     else if (level == SPAN_LOG_WARNING)
66         ast_level = __LOG_WARNING;
67     else
68         ast_level = __LOG_DEBUG;
69     ast_log(ast_level, __FILE__, __LINE__, __PRETTY_FUNCTION__, msg);
70 }
71 /*- End of function --------------------------------------------------------*/
72
73 static void t30_flush(t30_state_t *s, int which)
74 {
75     //TODO:
76 }
77 /*- End of function --------------------------------------------------------*/
78
79 static void phase_e_handler(t30_state_t *s, void *user_data, int result)
80 {
81     struct ast_channel *chan;
82     char far_ident[21];
83     
84     chan = (struct ast_channel *) user_data;
85     if (result == T30_ERR_OK)
86     {
87         t30_get_far_ident(s, far_ident);
88         pbx_builtin_setvar_helper(chan, "REMOTESTATIONID", far_ident);
89     }
90     else
91     {
92         ast_log(LOG_DEBUG, "==============================================================================\n");
93         ast_log(LOG_DEBUG, "Fax send not successful - result (%d) %s.\n", result, t30_completion_code_to_str(result));
94         ast_log(LOG_DEBUG, "==============================================================================\n");
95     }
96 }
97 /*- End of function --------------------------------------------------------*/
98
99 static int txfax_exec(struct ast_channel *chan, void *data)
100 {
101     int res = 0;
102     char source_file[256];
103     char *x;
104     char *s;
105     char *t;
106     char *v;
107     int option;
108     int len;
109     t30_state_t fax;
110     int calling_party;
111     int verbose;
112     int samples;
113     
114     struct localuser *u;
115     struct ast_frame *inf = NULL;
116     struct ast_frame outf;
117
118     int original_read_fmt;
119     int original_write_fmt;
120     
121     uint8_t __buf[sizeof(uint16_t)*MAX_BLOCK_SIZE + 2*AST_FRIENDLY_OFFSET];
122     uint8_t *buf = __buf + AST_FRIENDLY_OFFSET;
123
124     if (chan == NULL)
125     {
126         ast_log(LOG_WARNING, "Fax transmit channel is NULL. Giving up.\n");
127         return -1;
128     }
129
130     span_set_message_handler(span_message);
131
132     /* The next few lines of code parse out the filename and header from the input string */
133     if (data == NULL)
134     {
135         /* No data implies no filename or anything is present */
136         ast_log(LOG_WARNING, "Txfax requires an argument (filename)\n");
137         return -1;
138     }
139     
140     calling_party = FALSE;
141     verbose = FALSE;
142     source_file[0] = '\0'; 
143
144     for (option = 0, v = s = data;  v;  option++, s++)
145     {
146         t = s;
147         v = strchr(s, '|');
148         s = (v)  ?  v  :  s + strlen(s);
149         strncpy((char *) buf, t, s - t);
150         buf[s - t] = '\0';
151         if (option == 0)
152         {
153             /* The first option is always the file name */
154             len = s - t;
155             if (len > 255)
156                 len = 255;
157             strncpy(source_file, t, len);
158             source_file[len] = '\0';
159         }
160         else if (strncmp("caller", t, s - t) == 0)
161         {
162             calling_party = TRUE;
163         }
164         else if (strncmp("debug", t, s - t) == 0)
165         {
166             verbose = TRUE;
167         }
168     }
169
170     /* Done parsing */
171
172     LOCAL_USER_ADD(u);
173
174     if (chan->_state != AST_STATE_UP)
175     {
176         /* Shouldn't need this, but checking to see if channel is already answered
177          * Theoretically asterisk should already have answered before running the app */
178         res = ast_answer(chan);
179     }
180     
181     if (!res)
182     {
183         original_read_fmt = chan->readformat;
184         if (original_read_fmt != AST_FORMAT_SLINEAR)
185         {
186             res = ast_set_read_format(chan, AST_FORMAT_SLINEAR);
187             if (res < 0)
188             {
189                 ast_log(LOG_WARNING, "Unable to set to linear read mode, giving up\n");
190                 return -1;
191             }
192         }
193         original_write_fmt = chan->writeformat;
194         if (original_write_fmt != AST_FORMAT_SLINEAR)
195         {
196             res = ast_set_write_format(chan, AST_FORMAT_SLINEAR);
197             if (res < 0)
198             {
199                 ast_log(LOG_WARNING, "Unable to set to linear write mode, giving up\n");
200                 res = ast_set_read_format(chan, original_read_fmt);
201                 if (res)
202                     ast_log(LOG_WARNING, "Unable to restore read format on '%s'\n", chan->name);
203                 return -1;
204             }
205         }
206         fax_init(&fax, calling_party, NULL);
207         if (verbose)
208             fax.logging.level = SPAN_LOG_SHOW_SEVERITY | SPAN_LOG_SHOW_PROTOCOL | SPAN_LOG_FLOW;
209
210         x = pbx_builtin_getvar_helper(chan, "LOCALSTATIONID");
211         if (x  &&  x[0])
212             t30_set_local_ident(&fax, x);
213         x = pbx_builtin_getvar_helper(chan, "LOCALHEADERINFO");
214         if (x  &&  x[0])
215             t30_set_header_info(&fax, x);
216         t30_set_tx_file(&fax, source_file, -1, -1);
217         //t30_set_phase_b_handler(&fax, phase_b_handler, chan);
218         //t30_set_phase_d_handler(&fax, phase_d_handler, chan);
219         t30_set_phase_e_handler(&fax, phase_e_handler, chan);
220         while (ast_waitfor(chan, -1) > -1)
221         {
222             inf = ast_read(chan);
223             if (inf == NULL)
224             {
225                 res = -1;
226                 break;
227             }
228             if (inf->frametype == AST_FRAME_VOICE)
229             {
230                 if (fax_rx(&fax, inf->data, inf->samples))
231                     break;
232                 samples = (inf->samples <= MAX_BLOCK_SIZE)  ?  inf->samples  :  MAX_BLOCK_SIZE;
233                 len = fax_tx(&fax, (int16_t *) &buf[AST_FRIENDLY_OFFSET], samples);
234                 if (len)
235                 {
236                     memset(&outf, 0, sizeof(outf));
237                     outf.frametype = AST_FRAME_VOICE;
238                     outf.subclass = AST_FORMAT_SLINEAR;
239                     outf.datalen = len*sizeof(int16_t);
240                     outf.samples = len;
241                     outf.data = &buf[AST_FRIENDLY_OFFSET];
242                     outf.offset = AST_FRIENDLY_OFFSET;
243                     if (ast_write(chan, &outf) < 0)
244                     {
245                         ast_log(LOG_WARNING, "Unable to write frame to channel; %s\n", strerror(errno));
246                         break;
247                     }
248                 }
249             }
250             ast_frfree(inf);
251         }
252         if (inf == NULL)
253         {
254             ast_log(LOG_DEBUG, "Got hangup\n");
255             res = -1;
256         }
257         if (original_read_fmt != AST_FORMAT_SLINEAR)
258         {
259             res = ast_set_read_format(chan, original_read_fmt);
260             if (res)
261                 ast_log(LOG_WARNING, "Unable to restore read format on '%s'\n", chan->name);
262         }
263         if (original_write_fmt != AST_FORMAT_SLINEAR)
264         {
265             res = ast_set_write_format(chan, original_write_fmt);
266             if (res)
267                 ast_log(LOG_WARNING, "Unable to restore write format on '%s'\n", chan->name);
268         }
269         fax_release(&fax);
270     }
271     else
272     {
273         ast_log(LOG_WARNING, "Could not answer channel '%s'\n", chan->name);
274     }
275     LOCAL_USER_REMOVE(u);
276     return res;
277 }
278 /*- End of function --------------------------------------------------------*/
279
280 int unload_module(void)
281 {
282     STANDARD_HANGUP_LOCALUSERS;
283     return ast_unregister_application(app);
284 }
285 /*- End of function --------------------------------------------------------*/
286
287 int load_module(void)
288 {
289     return ast_register_application(app, txfax_exec, synopsis, descrip);
290 }
291 /*- End of function --------------------------------------------------------*/
292
293 char *description(void)
294 {
295     return tdesc;
296 }
297 /*- End of function --------------------------------------------------------*/
298
299 int usecount(void)
300 {
301     int res;
302
303     STANDARD_USECOUNT(res);
304     return res;
305 }
306 /*- End of function --------------------------------------------------------*/
307
308 char *key(void)
309 {
310     return ASTERISK_GPL_KEY;
311 }
312 /*- End of function --------------------------------------------------------*/
313 /*- End of file ------------------------------------------------------------*/
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