2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 1999-2008 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
58 #include <openssl/rand.h>
59 #include <openssl/x509.h>
60 #include <openssl/asn1.h>
61 #include <openssl/asn1t.h>
63 /* Generalised MIME like utilities for streaming ASN1. Although many
64 * have a PKCS7/CMS like flavour others are more general purpose.
67 /* MIME format structures
68 * Note that all are translated to lower case apart from
69 * parameter values. Quotes are stripped off
73 char *param_name; /* Param name e.g. "micalg" */
74 char *param_value; /* Param value e.g. "sha1" */
77 DECLARE_STACK_OF(MIME_PARAM)
78 IMPLEMENT_STACK_OF(MIME_PARAM)
81 char *name; /* Name of line e.g. "content-type" */
82 char *value; /* Value of line e.g. "text/plain" */
83 STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */
86 DECLARE_STACK_OF(MIME_HEADER)
87 IMPLEMENT_STACK_OF(MIME_HEADER)
89 static char * strip_ends(char *name);
90 static char * strip_start(char *name);
91 static char * strip_end(char *name);
92 static MIME_HEADER *mime_hdr_new(char *name, char *value);
93 static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value);
94 static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio);
95 static int mime_hdr_cmp(const MIME_HEADER * const *a,
96 const MIME_HEADER * const *b);
97 static int mime_param_cmp(const MIME_PARAM * const *a,
98 const MIME_PARAM * const *b);
99 static void mime_param_free(MIME_PARAM *param);
100 static int mime_bound_check(char *line, int linelen, char *bound, int blen);
101 static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret);
102 static int strip_eol(char *linebuf, int *plen);
103 static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name);
104 static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name);
105 static void mime_hdr_free(MIME_HEADER *hdr);
107 #define MAX_SMLEN 1024
108 #define mime_debug(x) /* x */
110 /* Base 64 read and write of ASN1 structure */
112 static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
117 b64 = BIO_new(BIO_f_base64());
120 ASN1err(ASN1_F_B64_WRITE_ASN1,ERR_R_MALLOC_FAILURE);
123 /* prepend the b64 BIO so all data is base64 encoded.
125 out = BIO_push(b64, out);
126 r = ASN1_item_i2d_bio(it, out, val);
127 (void)BIO_flush(out);
133 static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it)
137 if(!(b64 = BIO_new(BIO_f_base64()))) {
138 ASN1err(ASN1_F_B64_READ_ASN1,ERR_R_MALLOC_FAILURE);
141 bio = BIO_push(b64, bio);
142 val = ASN1_item_d2i_bio(it, bio, NULL);
144 ASN1err(ASN1_F_B64_READ_ASN1,ASN1_R_DECODE_ERROR);
145 (void)BIO_flush(bio);
151 /* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */
153 static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs)
155 int i, have_unknown = 0, write_comma, md_nid;
158 for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++)
161 BIO_write(out, ",", 1);
163 md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm);
167 BIO_puts(out, "sha1");
171 BIO_puts(out, "md5");
175 BIO_puts(out, "sha-256");
179 BIO_puts(out, "sha-384");
183 BIO_puts(out, "sha-512");
191 BIO_puts(out, "unknown");
205 int int_smime_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
206 int ctype_nid, int econt_nid,
207 STACK_OF(X509_ALGOR) *mdalgs,
208 asn1_output_data_fn *data_fn,
213 const char *mime_prefix, *mime_eol, *cname = "smime.p7m";
214 const char *msg_type=NULL;
215 if (flags & SMIME_OLDMIME)
216 mime_prefix = "application/x-pkcs7-";
218 mime_prefix = "application/pkcs7-";
220 if (flags & SMIME_CRLFEOL)
224 if((flags & SMIME_DETACHED) && data) {
225 /* We want multipart/signed */
226 /* Generate a random boundary */
227 RAND_pseudo_bytes((unsigned char *)bound, 32);
228 for(i = 0; i < 32; i++) {
235 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
236 BIO_printf(bio, "Content-Type: multipart/signed;");
237 BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);
238 BIO_puts(bio, " micalg=\"");
239 asn1_write_micalg(bio, mdalgs);
240 BIO_printf(bio, "\"; boundary=\"----%s\"%s%s",
241 bound, mime_eol, mime_eol);
242 BIO_printf(bio, "This is an S/MIME signed message%s%s",
244 /* Now write out the first part */
245 BIO_printf(bio, "------%s%s", bound, mime_eol);
246 if (!data_fn(bio, data, val, flags, it))
248 BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);
250 /* Headers for signature */
252 BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix);
253 BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);
254 BIO_printf(bio, "Content-Transfer-Encoding: base64%s",
256 BIO_printf(bio, "Content-Disposition: attachment;");
257 BIO_printf(bio, " filename=\"smime.p7s\"%s%s",
259 B64_write_ASN1(bio, val, NULL, 0, it);
260 BIO_printf(bio,"%s------%s--%s%s", mime_eol, bound,
265 /* Determine smime-type header */
267 if (ctype_nid == NID_pkcs7_enveloped)
268 msg_type = "enveloped-data";
269 else if (ctype_nid == NID_pkcs7_signed)
271 if (econt_nid == NID_id_smime_ct_receipt)
272 msg_type = "signed-receipt";
273 else if (sk_X509_ALGOR_num(mdalgs) >= 0)
274 msg_type = "signed-data";
276 msg_type = "certs-only";
278 else if (ctype_nid == NID_id_smime_ct_compressedData)
280 msg_type = "compressed-data";
284 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
285 BIO_printf(bio, "Content-Disposition: attachment;");
286 BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol);
287 BIO_printf(bio, "Content-Type: %smime;", mime_prefix);
289 BIO_printf(bio, " smime-type=%s;", msg_type);
290 BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol);
291 BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",
293 if (!B64_write_ASN1(bio, val, data, flags, it))
295 BIO_printf(bio, "%s", mime_eol);
301 /* Handle output of ASN1 data */
304 static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
308 const ASN1_AUX *aux = it->funcs;
309 ASN1_STREAM_ARG sarg;
311 if (!(flags & SMIME_DETACHED))
313 SMIME_crlf_copy(data, out, flags);
317 if (!aux || !aux->asn1_cb)
319 ASN1err(ASN1_F_ASN1_OUTPUT_DATA,
320 ASN1_R_STREAMING_NOT_SUPPORTED);
325 sarg.ndef_bio = NULL;
326 sarg.boundary = NULL;
328 /* Let ASN1 code prepend any needed BIOs */
330 if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0)
333 /* Copy data across, passing through filter BIOs for processing */
334 SMIME_crlf_copy(data, sarg.ndef_bio, flags);
336 /* Finalize structure */
337 if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0)
340 /* Now remove any digests prepended to the BIO */
342 while (sarg.ndef_bio != out)
344 tmpbio = BIO_pop(sarg.ndef_bio);
345 BIO_free(sarg.ndef_bio);
346 sarg.ndef_bio = tmpbio;
355 /* SMIME reader: handle multipart/signed and opaque signing.
356 * in multipart case the content is placed in a memory BIO
357 * pointed to by "bcont". In opaque this is set to NULL
360 ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it)
363 STACK_OF(MIME_HEADER) *headers = NULL;
364 STACK_OF(BIO) *parts = NULL;
370 if(bcont) *bcont = NULL;
372 if (!(headers = mime_parse_hdr(bio))) {
373 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_MIME_PARSE_ERROR);
377 if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
378 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
379 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE);
383 /* Handle multipart/signed */
385 if(!strcmp(hdr->value, "multipart/signed")) {
386 /* Split into two parts */
387 prm = mime_param_find(hdr, "boundary");
388 if(!prm || !prm->param_value) {
389 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
390 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY);
393 ret = multi_split(bio, prm->param_value, &parts);
394 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
395 if(!ret || (sk_BIO_num(parts) != 2) ) {
396 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE);
397 sk_BIO_pop_free(parts, BIO_vfree);
401 /* Parse the signature piece */
402 asnin = sk_BIO_value(parts, 1);
404 if (!(headers = mime_parse_hdr(asnin))) {
405 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_MIME_SIG_PARSE_ERROR);
406 sk_BIO_pop_free(parts, BIO_vfree);
410 /* Get content type */
412 if(!(hdr = mime_hdr_find(headers, "content-type")) ||
414 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
415 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE);
419 if(strcmp(hdr->value, "application/x-pkcs7-signature") &&
420 strcmp(hdr->value, "application/pkcs7-signature")) {
421 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_SIG_INVALID_MIME_TYPE);
422 ERR_add_error_data(2, "type: ", hdr->value);
423 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
424 sk_BIO_pop_free(parts, BIO_vfree);
427 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
429 if(!(val = b64_read_asn1(asnin, it))) {
430 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_ASN1_SIG_PARSE_ERROR);
431 sk_BIO_pop_free(parts, BIO_vfree);
436 *bcont = sk_BIO_value(parts, 0);
439 } else sk_BIO_pop_free(parts, BIO_vfree);
443 /* OK, if not multipart/signed try opaque signature */
445 if (strcmp (hdr->value, "application/x-pkcs7-mime") &&
446 strcmp (hdr->value, "application/pkcs7-mime")) {
447 ASN1err(ASN1_F_SMIME_READ_ASN1,ASN1_R_INVALID_MIME_TYPE);
448 ERR_add_error_data(2, "type: ", hdr->value);
449 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
453 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
455 if(!(val = b64_read_asn1(bio, it))) {
456 ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR);
463 /* Copy text from one BIO to another making the output CRLF at EOL */
464 int SMIME_crlf_copy(BIO *in, BIO *out, int flags)
469 char linebuf[MAX_SMLEN];
470 /* Buffer output so we don't write one line at a time. This is
471 * useful when streaming as we don't end up with one OCTET STRING
474 bf = BIO_new(BIO_f_buffer());
477 out = BIO_push(bf, out);
478 if(flags & SMIME_BINARY)
480 while((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0)
481 BIO_write(out, linebuf, len);
485 if(flags & SMIME_TEXT)
486 BIO_printf(out, "Content-Type: text/plain\r\n\r\n");
487 while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0)
489 eol = strip_eol(linebuf, &len);
491 BIO_write(out, linebuf, len);
492 if(eol) BIO_write(out, "\r\n", 2);
495 (void)BIO_flush(out);
501 /* Strip off headers if they are text/plain */
502 int SMIME_text(BIO *in, BIO *out)
506 STACK_OF(MIME_HEADER) *headers;
509 if (!(headers = mime_parse_hdr(in))) {
510 ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_MIME_PARSE_ERROR);
513 if(!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
514 ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_MIME_NO_CONTENT_TYPE);
515 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
518 if (strcmp (hdr->value, "text/plain")) {
519 ASN1err(ASN1_F_SMIME_TEXT,ASN1_R_INVALID_MIME_TYPE);
520 ERR_add_error_data(2, "type: ", hdr->value);
521 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
524 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
525 while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)
526 BIO_write(out, iobuf, len);
532 /* Split a multipart/XXX message body into component parts: result is
533 * canonical parts in a STACK of bios
536 static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret)
538 char linebuf[MAX_SMLEN];
540 int eol = 0, next_eol = 0;
542 STACK_OF(BIO) *parts;
543 char state, part, first;
545 blen = strlen(bound);
549 parts = sk_BIO_new_null();
551 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
552 state = mime_bound_check(linebuf, len, bound, blen);
556 } else if(state == 2) {
557 sk_BIO_push(parts, bpart);
560 /* Strip CR+LF from linebuf */
561 next_eol = strip_eol(linebuf, &len);
564 if(bpart) sk_BIO_push(parts, bpart);
565 bpart = BIO_new(BIO_s_mem());
566 BIO_set_mem_eof_return(bpart, 0);
568 BIO_write(bpart, "\r\n", 2);
571 BIO_write(bpart, linebuf, len);
577 /* This is the big one: parse MIME header lines up to message body */
579 #define MIME_INVALID 0
585 #define MIME_COMMENT 6
588 static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio)
592 char linebuf[MAX_SMLEN];
593 MIME_HEADER *mhdr = NULL;
594 STACK_OF(MIME_HEADER) *headers;
595 int len, state, save_state = 0;
597 headers = sk_MIME_HEADER_new(mime_hdr_cmp);
600 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
601 /* If whitespace at line start then continuation line */
602 if(mhdr && isspace((unsigned char)linebuf[0])) state = MIME_NAME;
603 else state = MIME_START;
605 /* Go through all characters */
606 for(p = linebuf, q = linebuf; (c = *p) && (c!='\r') && (c!='\n'); p++) {
608 /* State machine to handle MIME headers
609 * if this looks horrible that's because it *is*
617 ntmp = strip_ends(q);
624 mime_debug("Found End Value\n");
626 mhdr = mime_hdr_new(ntmp, strip_ends(q));
627 sk_MIME_HEADER_push(headers, mhdr);
631 } else if(c == '(') {
633 state = MIME_COMMENT;
647 ntmp = strip_ends(q);
656 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
659 } else if (c == '"') {
660 mime_debug("Found Quote\n");
662 } else if(c == '(') {
664 state = MIME_COMMENT;
670 mime_debug("Found Match Quote\n");
677 if(state == MIME_TYPE) {
678 mhdr = mime_hdr_new(ntmp, strip_ends(q));
679 sk_MIME_HEADER_push(headers, mhdr);
680 } else if(state == MIME_VALUE)
681 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
682 if(p == linebuf) break; /* Blank line means end of headers */
689 static char *strip_ends(char *name)
691 return strip_end(strip_start(name));
694 /* Strip a parameter of whitespace from start of param */
695 static char *strip_start(char *name)
698 /* Look for first non white space or quote */
699 for(p = name; (c = *p) ;p++) {
701 /* Next char is start of string if non null */
702 if(p[1]) return p + 1;
703 /* Else null string */
706 if(!isspace((unsigned char)c)) return p;
711 /* As above but strip from end of string : maybe should handle brackets? */
712 static char *strip_end(char *name)
715 if(!name) return NULL;
716 /* Look for first non white space or quote */
717 for(p = name + strlen(name) - 1; p >= name ;p--) {
720 if(p - 1 == name) return NULL;
724 if(isspace((unsigned char)c)) *p = 0;
730 static MIME_HEADER *mime_hdr_new(char *name, char *value)
733 char *tmpname, *tmpval, *p;
736 if(!(tmpname = BUF_strdup(name))) return NULL;
737 for(p = tmpname ; *p; p++) {
744 } else tmpname = NULL;
746 if(!(tmpval = BUF_strdup(value))) return NULL;
747 for(p = tmpval ; *p; p++) {
754 } else tmpval = NULL;
755 mhdr = (MIME_HEADER *) OPENSSL_malloc(sizeof(MIME_HEADER));
756 if(!mhdr) return NULL;
757 mhdr->name = tmpname;
758 mhdr->value = tmpval;
759 if(!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) return NULL;
763 static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value)
765 char *tmpname, *tmpval, *p;
769 tmpname = BUF_strdup(name);
770 if(!tmpname) return 0;
771 for(p = tmpname ; *p; p++) {
778 } else tmpname = NULL;
780 tmpval = BUF_strdup(value);
781 if(!tmpval) return 0;
782 } else tmpval = NULL;
783 /* Parameter values are case sensitive so leave as is */
784 mparam = (MIME_PARAM *) OPENSSL_malloc(sizeof(MIME_PARAM));
785 if(!mparam) return 0;
786 mparam->param_name = tmpname;
787 mparam->param_value = tmpval;
788 sk_MIME_PARAM_push(mhdr->params, mparam);
792 static int mime_hdr_cmp(const MIME_HEADER * const *a,
793 const MIME_HEADER * const *b)
795 if (!(*a)->name || !(*b)->name)
796 return !!(*a)->name - !!(*b)->name;
798 return(strcmp((*a)->name, (*b)->name));
801 static int mime_param_cmp(const MIME_PARAM * const *a,
802 const MIME_PARAM * const *b)
804 if (!(*a)->param_name || !(*b)->param_name)
805 return !!(*a)->param_name - !!(*b)->param_name;
806 return(strcmp((*a)->param_name, (*b)->param_name));
809 /* Find a header with a given name (if possible) */
811 static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name)
816 idx = sk_MIME_HEADER_find(hdrs, &htmp);
817 if(idx < 0) return NULL;
818 return sk_MIME_HEADER_value(hdrs, idx);
821 static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name)
825 param.param_name = name;
826 idx = sk_MIME_PARAM_find(hdr->params, ¶m);
827 if(idx < 0) return NULL;
828 return sk_MIME_PARAM_value(hdr->params, idx);
831 static void mime_hdr_free(MIME_HEADER *hdr)
833 if(hdr->name) OPENSSL_free(hdr->name);
834 if(hdr->value) OPENSSL_free(hdr->value);
835 if(hdr->params) sk_MIME_PARAM_pop_free(hdr->params, mime_param_free);
839 static void mime_param_free(MIME_PARAM *param)
841 if(param->param_name) OPENSSL_free(param->param_name);
842 if(param->param_value) OPENSSL_free(param->param_value);
846 /* Check for a multipart boundary. Returns:
851 static int mime_bound_check(char *line, int linelen, char *bound, int blen)
853 if(linelen == -1) linelen = strlen(line);
854 if(blen == -1) blen = strlen(bound);
855 /* Quickly eliminate if line length too short */
856 if(blen + 2 > linelen) return 0;
857 /* Check for part boundary */
858 if(!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) {
859 if(!strncmp(line + blen + 2, "--", 2)) return 2;
865 static int strip_eol(char *linebuf, int *plen)
870 p = linebuf + len - 1;
871 for (p = linebuf + len - 1; len > 0; len--, p--)