summaryrefslogtreecommitdiffstats
path: root/src/bounce/bounce_templates.c
blob: 11daece4165ec7c61991a613a68d5040be9a0a67 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
/*++
/* NAME
/*	bounce_templates 3
/* SUMMARY
/*	bounce template group support
/* SYNOPSIS
/*	#include <bounce_template.h>
/*
/*	typedef struct {
/* .in +4
/*		BOUNCE_TEMPLATE *failure;
/*		BOUNCE_TEMPLATE *delay;
/*		BOUNCE_TEMPLATE *success;
/*		BOUNCE_TEMPLATE *verify;
/* .in -4
/*	} BOUNCE_TEMPLATES;
/*
/*	BOUNCE_TEMPLATES *bounce_templates_create(void)
/*
/*	void	bounce_templates_free(templates)
/*	BOUNCE_TEMPLATES *templates;
/*
/*	void	bounce_templates_load(stream, templates)
/*	VSTREAM	*stream;
/*	BOUNCE_TEMPLATES *templates;
/*
/*	void	bounce_templates_expand(stream, templates)
/*	VSTREAM	*stream;
/*	BOUNCE_TEMPLATES *templates;
/*
/*	void	bounce_templates_dump(stream, templates)
/*	VSTREAM	*stream;
/*	BOUNCE_TEMPLATES *templates;
/* DESCRIPTION
/*	This module implements support for bounce template groups
/*	(i.e. groups that contain one template of each type).
/*
/*	bounce_templates_create() creates a bounce template group,
/*	with default settings.
/*
/*	bounce_templates_free() destroys a bounce template group.
/*
/*	bounce_templates_load() reads zero or more bounce templates
/*	from the specified file to override built-in templates.
/*
/*	bounce_templates_expand() expands $name macros and writes
/*	the text portions of the specified bounce template group
/*	to the specified stream.
/*
/*	bounce_templates_dump() writes the complete content of the
/*	specified bounce template group to the specified stream.
/*	The format is compatible with bounce_templates_load().
/* DIAGNOSTICS
/*	Fatal error: out of memory, undefined macro name in template.
/* SEE ALSO
/*	bounce_template(3) bounce template support
/* LICENSE
/* .ad
/* .fi
/*	The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/*	Wietse Venema
/*	IBM T.J. Watson Research
/*	P.O. Box 704
/*	Yorktown Heights, NY 10598, USA
/*--*/

/* System library. */

#include <sys_defs.h>
#include <ctype.h>
#include <string.h>

/* Utility library. */

#include <msg.h>
#include <mymalloc.h>
#include <stringops.h>
#include <vstring.h>
#include <vstream.h>
#include <vstring_vstream.h>

/* Global library. */

#include <mail_addr.h>
#include <mail_proto.h>

/* Application-specific. */

#include <bounce_template.h>

 /*
  * The fail template is for permanent failure.
  */
static const char *def_bounce_failure_body[] = {
    "This is the mail system at host $myhostname.",
    "",
    "I'm sorry to have to inform you that your message could not",
    "be delivered to one or more recipients. It's attached below.",
    "",
    "For further assistance, please send mail to " MAIL_ADDR_POSTMASTER ".",
    "",
    "If you do so, please include this problem report. You can",
    "delete your own text from the attached returned message.",
    "",
    "                   The mail system",
    0,
};

static const BOUNCE_TEMPLATE def_bounce_failure_template = {
    0,
    BOUNCE_TMPL_CLASS_FAILURE,
    "[built-in]",
    "us-ascii",
    MAIL_ATTR_ENC_7BIT,
    MAIL_ADDR_MAIL_DAEMON " (Mail Delivery System)",
    "Undelivered Mail Returned to Sender",
    "Postmaster Copy: Undelivered Mail",
    def_bounce_failure_body,
    &def_bounce_failure_template,
};

 /*
  * The delay template is for delayed mail notifications.
  */
static const char *def_bounce_delay_body[] = {
    "This is the mail system at host $myhostname.",
    "",
    "####################################################################",
    "# THIS IS A WARNING ONLY.  YOU DO NOT NEED TO RESEND YOUR MESSAGE. #",
    "####################################################################",
    "",
    "Your message could not be delivered for more than $delay_warning_time_hours hour(s)."
    ,
    "It will be retried until it is $maximal_queue_lifetime_days day(s) old.",
    "",
    "For further assistance, please send mail to " MAIL_ADDR_POSTMASTER ".",
    "",
    "If you do so, please include this problem report. You can",
    "delete your own text from the attached returned message.",
    "",
    "                   The mail system",
    0,
};

static const BOUNCE_TEMPLATE def_bounce_delay_template = {
    0,
    BOUNCE_TMPL_CLASS_DELAY,
    "[built-in]",
    "us-ascii",
    MAIL_ATTR_ENC_7BIT,
    MAIL_ADDR_MAIL_DAEMON " (Mail Delivery System)",
    "Delayed Mail (still being retried)",
    "Postmaster Warning: Delayed Mail",
    def_bounce_delay_body,
    &def_bounce_delay_template
};

 /*
  * The success template is for "delivered", "expanded" and "relayed" success
  * notifications.
  */
static const char *def_bounce_success_body[] = {
    "This is the mail system at host $myhostname.",
    "",
    "Your message was successfully delivered to the destination(s)",
    "listed below. If the message was delivered to mailbox you will",
    "receive no further notifications. Otherwise you may still receive",
    "notifications of mail delivery errors from other systems.",
    "",
    "                   The mail system",
    0,
};

static const BOUNCE_TEMPLATE def_bounce_success_template = {
    0,
    BOUNCE_TMPL_CLASS_SUCCESS,
    "[built-in]",
    "us-ascii",
    MAIL_ATTR_ENC_7BIT,
    MAIL_ADDR_MAIL_DAEMON " (Mail Delivery System)",
    "Successful Mail Delivery Report",
    0,
    def_bounce_success_body,
    &def_bounce_success_template,
};

 /*
  * The "verify" template is for verbose delivery (sendmail -v) and for
  * address verification (sendmail -bv).
  */
static const char *def_bounce_verify_body[] = {
    "This is the mail system at host $myhostname.",
    "",
    "Enclosed is the mail delivery report that you requested.",
    "",
    "                   The mail system",
    0,
};

static const BOUNCE_TEMPLATE def_bounce_verify_template = {
    0,
    BOUNCE_TMPL_CLASS_VERIFY,
    "[built-in]",
    "us-ascii",
    MAIL_ATTR_ENC_7BIT,
    MAIL_ADDR_MAIL_DAEMON " (Mail Delivery System)",
    "Mail Delivery Status Report",
    0,
    def_bounce_verify_body,
    &def_bounce_verify_template,
};

 /*
  * SLMs.
  */
#define STR(x)	vstring_str(x)

/* bounce_templates_create - create template group */

BOUNCE_TEMPLATES *bounce_templates_create(void)
{
    BOUNCE_TEMPLATES *bs;

    bs = (BOUNCE_TEMPLATES *) mymalloc(sizeof(*bs));
    bs->failure = bounce_template_create(&def_bounce_failure_template);
    bs->delay = bounce_template_create(&def_bounce_delay_template);
    bs->success = bounce_template_create(&def_bounce_success_template);
    bs->verify = bounce_template_create(&def_bounce_verify_template);
    return (bs);
}

/* bounce_templates_free - destroy template group */

void    bounce_templates_free(BOUNCE_TEMPLATES *bs)
{
    bounce_template_free(bs->failure);
    bounce_template_free(bs->delay);
    bounce_template_free(bs->success);
    bounce_template_free(bs->verify);
    myfree((void *) bs);
}

/* bounce_templates_load - load template or group from stream */

void    bounce_templates_load(VSTREAM *fp, BOUNCE_TEMPLATES *ts)
{
    VSTRING *line_buf;
    char   *member_name;
    VSTRING *multi_line_buf = 0;
    VSTRING *saved_member_name = 0;
    VSTRING *saved_end_marker = 0;
    char   *value;
    int     lineno;
    const char *err;
    char   *cp;
    int     len;			/* Grr... */

    /*
     * XXX That's a lot of non-reusable code to parse a configuration file.
     * Unfortunately, much of the "name = value" infrastructure is married to
     * the dict(3) class which doesn't really help here.
     */
    line_buf = vstring_alloc(100);
    lineno = 1;
    while (vstring_get_nonl(line_buf, fp) > 0) {
	lineno++;
	cp = STR(line_buf) + strspn(STR(line_buf), " \t\n\v\f\r");
	if (*cp == 0 || *cp == '#')
	    continue;
	if ((err = split_nameval(STR(line_buf), &member_name, &value)) != 0)
	    msg_fatal("%s, line %d: %s: \"%s\"",
		      VSTREAM_PATH(fp), lineno, err, STR(line_buf));
	if (value[0] == '<' && value[1] == '<') {
	    value += 2;
	    while (ISSPACE(*value))
		value++;
	    if (*value == 0)
		msg_fatal("%s, line %d: missing end marker after <<",
			  VSTREAM_PATH(fp), lineno);
	    if (!ISALNUM(*value))
		msg_fatal("%s, line %d: malformed end marker after <<",
			  VSTREAM_PATH(fp), lineno);
	    if (multi_line_buf == 0) {
		saved_member_name = vstring_alloc(100);
		saved_end_marker = vstring_alloc(100);
		multi_line_buf = vstring_alloc(100);
	    } else
		VSTRING_RESET(multi_line_buf);
	    vstring_strcpy(saved_member_name, member_name);
	    vstring_strcpy(saved_end_marker, value);
	    while (vstring_get_nonl(line_buf, fp) > 0) {
		lineno++;
		if (strcmp(STR(line_buf), STR(saved_end_marker)) == 0)
		    break;
		if (VSTRING_LEN(multi_line_buf) > 0)
		    vstring_strcat(multi_line_buf, "\n");
		vstring_strcat(multi_line_buf, STR(line_buf));
	    }
	    if (vstream_feof(fp))
		msg_warn("%s, line %d: missing \"%s\" end marker",
			 VSTREAM_PATH(fp), lineno, value);
	    member_name = STR(saved_member_name);
	    value = STR(multi_line_buf);
	}
#define MATCH_TMPL_NAME(tname, tname_len, mname) \
    (strncmp(tname, mname, tname_len = strlen(tname)) == 0 \
	&& strcmp(mname + tname_len, "_template") == 0)

	if (MATCH_TMPL_NAME(ts->failure->class, len, member_name))
	    bounce_template_load(ts->failure, VSTREAM_PATH(fp), value);
	else if (MATCH_TMPL_NAME(ts->delay->class, len, member_name))
	    bounce_template_load(ts->delay, VSTREAM_PATH(fp), value);
	else if (MATCH_TMPL_NAME(ts->success->class, len, member_name))
	    bounce_template_load(ts->success, VSTREAM_PATH(fp), value);
	else if (MATCH_TMPL_NAME(ts->verify->class, len, member_name))
	    bounce_template_load(ts->verify, VSTREAM_PATH(fp), value);
	else
	    msg_warn("%s, line %d: unknown template name: %s "
		     "-- ignoring this template",
		     VSTREAM_PATH(fp), lineno, member_name);
    }
    vstring_free(line_buf);
    if (multi_line_buf) {
	vstring_free(saved_member_name);
	vstring_free(saved_end_marker);
	vstring_free(multi_line_buf);
    }
}

/* bounce_plain_out - output line as plain text */

static int bounce_plain_out(VSTREAM *fp, const char *text)
{
    vstream_fprintf(fp, "%s\n", text);
    return (0);
}

/* bounce_templates_expand - dump expanded template group text to stream */

void    bounce_templates_expand(VSTREAM *fp, BOUNCE_TEMPLATES *ts)
{
    BOUNCE_TEMPLATE *tp;

    tp = ts->failure;
    vstream_fprintf(fp, "expanded_%s_text = <<EOF\n", tp->class);
    bounce_template_expand(bounce_plain_out, fp, tp);
    vstream_fprintf(fp, "EOF\n\n");

    tp = ts->delay;
    vstream_fprintf(fp, "expanded_%s_text = <<EOF\n", tp->class);
    bounce_template_expand(bounce_plain_out, fp, tp);
    vstream_fprintf(fp, "EOF\n\n");

    tp = ts->success;
    vstream_fprintf(fp, "expanded_%s_text = <<EOF\n", tp->class);
    bounce_template_expand(bounce_plain_out, fp, tp);
    vstream_fprintf(fp, "EOF\n\n");

    tp = ts->verify;
    vstream_fprintf(fp, "expanded_%s_text = <<EOF\n", tp->class);
    bounce_template_expand(bounce_plain_out, fp, tp);
    vstream_fprintf(fp, "EOF\n");
}

/* bounce_templates_dump - dump bounce template group to stream */

void    bounce_templates_dump(VSTREAM *fp, BOUNCE_TEMPLATES *ts)
{
    BOUNCE_TEMPLATE *tp;

    tp = ts->failure;
    vstream_fprintf(fp, "%s_template = <<EOF\n", tp->class);
    bounce_template_dump(fp, tp);
    vstream_fprintf(fp, "EOF\n\n");

    tp = ts->delay;
    vstream_fprintf(fp, "%s_template = <<EOF\n", tp->class);
    bounce_template_dump(fp, tp);
    vstream_fprintf(fp, "EOF\n\n");

    tp = ts->success;
    vstream_fprintf(fp, "%s_template = <<EOF\n", tp->class);
    bounce_template_dump(fp, tp);
    vstream_fprintf(fp, "EOF\n\n");

    tp = ts->verify;
    vstream_fprintf(fp, "%s_template = <<EOF\n", tp->class);
    bounce_template_dump(fp, tp);
    vstream_fprintf(fp, "EOF\n");
}