1 /* $OpenBSD: asn_mime.c,v 1.27 2017/01/29 17:49:22 beck Exp $ */
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 * ====================================================================
60 #include <openssl/asn1.h>
61 #include <openssl/asn1t.h>
62 #include <openssl/err.h>
63 #include <openssl/x509.h>
65 #include "asn1_locl.h"
67 /* Generalised MIME like utilities for streaming ASN1. Although many
68 * have a PKCS7/CMS like flavour others are more general purpose.
71 /* MIME format structures
72 * Note that all are translated to lower case apart from
73 * parameter values. Quotes are stripped off
77 char *param_name; /* Param name e.g. "micalg" */
78 char *param_value; /* Param value e.g. "sha1" */
81 DECLARE_STACK_OF(MIME_PARAM)
84 char *name; /* Name of line e.g. "content-type" */
85 char *value; /* Value of line e.g. "text/plain" */
86 STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */
89 DECLARE_STACK_OF(MIME_HEADER)
91 static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
93 static char * strip_ends(char *name);
94 static char * strip_start(char *name);
95 static char * strip_end(char *name);
96 static MIME_HEADER *mime_hdr_new(char *name, char *value);
97 static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value);
98 static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio);
99 static int mime_hdr_cmp(const MIME_HEADER * const *a,
100 const MIME_HEADER * const *b);
101 static int mime_param_cmp(const MIME_PARAM * const *a,
102 const MIME_PARAM * const *b);
103 static void mime_param_free(MIME_PARAM *param);
104 static int mime_bound_check(char *line, int linelen, char *bound, int blen);
105 static int multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret);
106 static int strip_eol(char *linebuf, int *plen);
107 static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name);
108 static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name);
109 static void mime_hdr_free(MIME_HEADER *hdr);
111 #define MAX_SMLEN 1024
112 #define mime_debug(x) /* x */
114 /* Output an ASN1 structure in BER format streaming if necessary */
117 i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
120 /* If streaming create stream BIO and copy all content through it */
121 if (flags & SMIME_STREAM) {
123 bio = BIO_new_NDEF(out, val, it);
125 ASN1error(ERR_R_MALLOC_FAILURE);
128 SMIME_crlf_copy(in, bio, flags);
129 (void)BIO_flush(bio);
130 /* Free up successive BIOs until we hit the old output BIO */
135 } while (bio != out);
137 /* else just write out ASN1 structure which will have all content
141 ASN1_item_i2d_bio(it, out, val);
145 /* Base 64 read and write of ASN1 structure */
148 B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
154 b64 = BIO_new(BIO_f_base64());
156 ASN1error(ERR_R_MALLOC_FAILURE);
159 /* prepend the b64 BIO so all data is base64 encoded.
161 out = BIO_push(b64, out);
162 r = i2d_ASN1_bio_stream(out, val, in, flags, it);
163 (void)BIO_flush(out);
169 /* Streaming ASN1 PEM write */
172 PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
173 const char *hdr, const ASN1_ITEM *it)
177 BIO_printf(out, "-----BEGIN %s-----\n", hdr);
178 r = B64_write_ASN1(out, val, in, flags, it);
179 BIO_printf(out, "-----END %s-----\n", hdr);
184 b64_read_asn1(BIO *bio, const ASN1_ITEM *it)
188 if (!(b64 = BIO_new(BIO_f_base64()))) {
189 ASN1error(ERR_R_MALLOC_FAILURE);
192 bio = BIO_push(b64, bio);
193 val = ASN1_item_d2i_bio(it, bio, NULL);
195 ASN1error(ASN1_R_DECODE_ERROR);
196 (void)BIO_flush(bio);
202 /* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */
205 asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs)
208 int i, have_unknown = 0, write_comma, ret = 0, md_nid;
212 for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) {
214 BIO_write(out, ",", 1);
216 md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm);
217 md = EVP_get_digestbynid(md_nid);
218 if (md && md->md_ctrl) {
221 rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr);
223 BIO_puts(out, micstr);
232 BIO_puts(out, "sha1");
236 BIO_puts(out, "md5");
240 BIO_puts(out, "sha-256");
244 BIO_puts(out, "sha-384");
248 BIO_puts(out, "sha-512");
251 case NID_id_GostR3411_94:
252 BIO_puts(out, "gostr3411-94");
260 BIO_puts(out, "unknown");
277 SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
278 int ctype_nid, int econt_nid, STACK_OF(X509_ALGOR) *mdalgs,
283 const char *mime_prefix, *mime_eol, *cname = "smime.p7m";
284 const char *msg_type = NULL;
286 if (flags & SMIME_OLDMIME)
287 mime_prefix = "application/x-pkcs7-";
289 mime_prefix = "application/pkcs7-";
291 if (flags & SMIME_CRLFEOL)
295 if ((flags & SMIME_DETACHED) && data) {
296 /* We want multipart/signed */
297 /* Generate a random boundary */
298 arc4random_buf(bound, 32);
299 for (i = 0; i < 32; i++) {
308 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
309 BIO_printf(bio, "Content-Type: multipart/signed;");
310 BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);
311 BIO_puts(bio, " micalg=\"");
312 asn1_write_micalg(bio, mdalgs);
313 BIO_printf(bio, "\"; boundary=\"----%s\"%s%s",
314 bound, mime_eol, mime_eol);
315 BIO_printf(bio, "This is an S/MIME signed message%s%s",
317 /* Now write out the first part */
318 BIO_printf(bio, "------%s%s", bound, mime_eol);
319 if (!asn1_output_data(bio, data, val, flags, it))
321 BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);
323 /* Headers for signature */
325 BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix);
326 BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);
327 BIO_printf(bio, "Content-Transfer-Encoding: base64%s",
329 BIO_printf(bio, "Content-Disposition: attachment;");
330 BIO_printf(bio, " filename=\"smime.p7s\"%s%s",
332 B64_write_ASN1(bio, val, NULL, 0, it);
333 BIO_printf(bio, "%s------%s--%s%s", mime_eol, bound,
338 /* Determine smime-type header */
340 if (ctype_nid == NID_pkcs7_enveloped)
341 msg_type = "enveloped-data";
342 else if (ctype_nid == NID_pkcs7_signed) {
343 if (econt_nid == NID_id_smime_ct_receipt)
344 msg_type = "signed-receipt";
345 else if (sk_X509_ALGOR_num(mdalgs) >= 0)
346 msg_type = "signed-data";
348 msg_type = "certs-only";
349 } else if (ctype_nid == NID_id_smime_ct_compressedData) {
350 msg_type = "compressed-data";
354 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
355 BIO_printf(bio, "Content-Disposition: attachment;");
356 BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol);
357 BIO_printf(bio, "Content-Type: %smime;", mime_prefix);
359 BIO_printf(bio, " smime-type=%s;", msg_type);
360 BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol);
361 BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",
363 if (!B64_write_ASN1(bio, val, data, flags, it))
365 BIO_printf(bio, "%s", mime_eol);
369 /* Handle output of ASN1 data */
373 asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
377 const ASN1_AUX *aux = it->funcs;
378 ASN1_STREAM_ARG sarg;
381 /* If data is not deteched or resigning then the output BIO is
382 * already set up to finalise when it is written through.
384 if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) {
385 SMIME_crlf_copy(data, out, flags);
389 if (!aux || !aux->asn1_cb) {
390 ASN1error(ASN1_R_STREAMING_NOT_SUPPORTED);
395 sarg.ndef_bio = NULL;
396 sarg.boundary = NULL;
398 /* Let ASN1 code prepend any needed BIOs */
400 if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0)
403 /* Copy data across, passing through filter BIOs for processing */
404 SMIME_crlf_copy(data, sarg.ndef_bio, flags);
406 /* Finalize structure */
407 if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0)
410 /* Now remove any digests prepended to the BIO */
412 while (sarg.ndef_bio != out) {
413 tmpbio = BIO_pop(sarg.ndef_bio);
414 BIO_free(sarg.ndef_bio);
415 sarg.ndef_bio = tmpbio;
421 /* SMIME reader: handle multipart/signed and opaque signing.
422 * in multipart case the content is placed in a memory BIO
423 * pointed to by "bcont". In opaque this is set to NULL
427 SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it)
430 STACK_OF(MIME_HEADER) *headers = NULL;
431 STACK_OF(BIO) *parts = NULL;
440 if (!(headers = mime_parse_hdr(bio))) {
441 ASN1error(ASN1_R_MIME_PARSE_ERROR);
445 if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
446 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
447 ASN1error(ASN1_R_NO_CONTENT_TYPE);
451 /* Handle multipart/signed */
453 if (!strcmp(hdr->value, "multipart/signed")) {
454 /* Split into two parts */
455 prm = mime_param_find(hdr, "boundary");
456 if (!prm || !prm->param_value) {
457 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
458 ASN1error(ASN1_R_NO_MULTIPART_BOUNDARY);
461 ret = multi_split(bio, prm->param_value, &parts);
462 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
463 if (!ret || (sk_BIO_num(parts) != 2) ) {
464 ASN1error(ASN1_R_NO_MULTIPART_BODY_FAILURE);
465 sk_BIO_pop_free(parts, BIO_vfree);
469 /* Parse the signature piece */
470 asnin = sk_BIO_value(parts, 1);
472 if (!(headers = mime_parse_hdr(asnin))) {
473 ASN1error(ASN1_R_MIME_SIG_PARSE_ERROR);
474 sk_BIO_pop_free(parts, BIO_vfree);
478 /* Get content type */
480 if (!(hdr = mime_hdr_find(headers, "content-type")) ||
482 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
483 sk_BIO_pop_free(parts, BIO_vfree);
484 ASN1error(ASN1_R_NO_SIG_CONTENT_TYPE);
488 if (strcmp(hdr->value, "application/x-pkcs7-signature") &&
489 strcmp(hdr->value, "application/pkcs7-signature")) {
490 ASN1error(ASN1_R_SIG_INVALID_MIME_TYPE);
491 ERR_asprintf_error_data("type: %s", hdr->value);
492 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
493 sk_BIO_pop_free(parts, BIO_vfree);
496 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
498 if (!(val = b64_read_asn1(asnin, it))) {
499 ASN1error(ASN1_R_ASN1_SIG_PARSE_ERROR);
500 sk_BIO_pop_free(parts, BIO_vfree);
505 *bcont = sk_BIO_value(parts, 0);
508 } else sk_BIO_pop_free(parts, BIO_vfree);
512 /* OK, if not multipart/signed try opaque signature */
514 if (strcmp (hdr->value, "application/x-pkcs7-mime") &&
515 strcmp (hdr->value, "application/pkcs7-mime")) {
516 ASN1error(ASN1_R_INVALID_MIME_TYPE);
517 ERR_asprintf_error_data("type: %s", hdr->value);
518 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
522 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
524 if (!(val = b64_read_asn1(bio, it))) {
525 ASN1error(ASN1_R_ASN1_PARSE_ERROR);
531 /* Copy text from one BIO to another making the output CRLF at EOL */
533 SMIME_crlf_copy(BIO *in, BIO *out, int flags)
538 char linebuf[MAX_SMLEN];
540 /* Buffer output so we don't write one line at a time. This is
541 * useful when streaming as we don't end up with one OCTET STRING
544 bf = BIO_new(BIO_f_buffer());
547 out = BIO_push(bf, out);
548 if (flags & SMIME_BINARY) {
549 while ((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0)
550 BIO_write(out, linebuf, len);
552 if (flags & SMIME_TEXT)
553 BIO_printf(out, "Content-Type: text/plain\r\n\r\n");
554 while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) {
555 eol = strip_eol(linebuf, &len);
557 BIO_write(out, linebuf, len);
559 BIO_write(out, "\r\n", 2);
562 (void)BIO_flush(out);
568 /* Strip off headers if they are text/plain */
570 SMIME_text(BIO *in, BIO *out)
574 STACK_OF(MIME_HEADER) *headers;
577 if (!(headers = mime_parse_hdr(in))) {
578 ASN1error(ASN1_R_MIME_PARSE_ERROR);
581 if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
582 ASN1error(ASN1_R_MIME_NO_CONTENT_TYPE);
583 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
586 if (strcmp (hdr->value, "text/plain")) {
587 ASN1error(ASN1_R_INVALID_MIME_TYPE);
588 ERR_asprintf_error_data("type: %s", hdr->value);
589 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
592 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
593 while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)
594 BIO_write(out, iobuf, len);
601 * Split a multipart/XXX message body into component parts: result is
602 * canonical parts in a STACK of bios
605 multi_split(BIO *bio, char *bound, STACK_OF(BIO) **ret)
607 char linebuf[MAX_SMLEN];
609 int eol = 0, next_eol = 0;
611 STACK_OF(BIO) *parts;
612 char state, part, first;
614 blen = strlen(bound);
618 parts = sk_BIO_new_null();
622 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
623 state = mime_bound_check(linebuf, len, bound, blen);
627 } else if (state == 2) {
628 if (sk_BIO_push(parts, bpart) == 0)
632 /* Strip CR+LF from linebuf */
633 next_eol = strip_eol(linebuf, &len);
637 if (sk_BIO_push(parts, bpart) == 0)
640 bpart = BIO_new(BIO_s_mem());
643 BIO_set_mem_eof_return(bpart, 0);
645 BIO_write(bpart, "\r\n", 2);
648 BIO_write(bpart, linebuf, len);
655 /* This is the big one: parse MIME header lines up to message body */
657 #define MIME_INVALID 0
663 #define MIME_COMMENT 6
667 STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio)
671 char linebuf[MAX_SMLEN];
672 MIME_HEADER *mhdr = NULL;
673 STACK_OF(MIME_HEADER) *headers;
674 int len, state, save_state = 0;
676 headers = sk_MIME_HEADER_new(mime_hdr_cmp);
679 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
680 /* If whitespace at line start then continuation line */
681 if (mhdr && isspace((unsigned char)linebuf[0]))
687 /* Go through all characters */
688 for (p = linebuf, q = linebuf;
689 (c = *p) && (c != '\r') && (c != '\n'); p++) {
691 /* State machine to handle MIME headers
692 * if this looks horrible that's because it *is*
700 ntmp = strip_ends(q);
707 mime_debug("Found End Value\n");
709 mhdr = mime_hdr_new(ntmp,
713 if (sk_MIME_HEADER_push(headers,
719 } else if (c == '(') {
721 state = MIME_COMMENT;
735 ntmp = strip_ends(q);
744 mime_hdr_addparam(mhdr, ntmp,
748 } else if (c == '"') {
749 mime_debug("Found Quote\n");
751 } else if (c == '(') {
753 state = MIME_COMMENT;
759 mime_debug("Found Match Quote\n");
766 if (state == MIME_TYPE) {
767 mhdr = mime_hdr_new(ntmp, strip_ends(q));
770 if (sk_MIME_HEADER_push(headers, mhdr) == 0)
772 } else if (state == MIME_VALUE)
773 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
776 break; /* Blank line means end of headers */
784 sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
789 strip_ends(char *name)
791 return strip_end(strip_start(name));
794 /* Strip a parameter of whitespace from start of param */
796 strip_start(char *name)
800 /* Look for first non white space or quote */
801 for (p = name; (c = *p); p++) {
803 /* Next char is start of string if non null */
806 /* Else null string */
809 if (!isspace((unsigned char)c))
815 /* As above but strip from end of string : maybe should handle brackets? */
817 strip_end(char *name)
824 /* Look for first non white space or quote */
825 for (p = name + strlen(name) - 1; p >= name; p--) {
833 if (isspace((unsigned char)c))
842 mime_hdr_new(char *name, char *value)
845 char *tmpname = NULL, *tmpval = NULL, *p;
848 if (!(tmpname = strdup(name)))
850 for (p = tmpname; *p; p++)
851 *p = tolower((unsigned char)*p);
854 if (!(tmpval = strdup(value)))
856 for (p = tmpval; *p; p++)
857 *p = tolower((unsigned char)*p);
859 mhdr = malloc(sizeof(MIME_HEADER));
862 mhdr->name = tmpname;
863 mhdr->value = tmpval;
864 if (!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp))) {
876 mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value)
878 char *tmpname = NULL, *tmpval = NULL, *p;
882 tmpname = strdup(name);
885 for (p = tmpname; *p; p++)
886 *p = tolower((unsigned char)*p);
889 tmpval = strdup(value);
893 /* Parameter values are case sensitive so leave as is */
894 mparam = malloc(sizeof(MIME_PARAM));
897 mparam->param_name = tmpname;
898 mparam->param_value = tmpval;
899 if (sk_MIME_PARAM_push(mhdr->params, mparam) == 0) {
911 mime_hdr_cmp(const MIME_HEADER * const *a, const MIME_HEADER * const *b)
913 if (!(*a)->name || !(*b)->name)
914 return !!(*a)->name - !!(*b)->name;
915 return (strcmp((*a)->name, (*b)->name));
919 mime_param_cmp(const MIME_PARAM * const *a, const MIME_PARAM * const *b)
921 if (!(*a)->param_name || !(*b)->param_name)
922 return !!(*a)->param_name - !!(*b)->param_name;
923 return (strcmp((*a)->param_name, (*b)->param_name));
926 /* Find a header with a given name (if possible) */
929 mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, char *name)
934 idx = sk_MIME_HEADER_find(hdrs, &htmp);
937 return sk_MIME_HEADER_value(hdrs, idx);
941 mime_param_find(MIME_HEADER *hdr, char *name)
945 param.param_name = name;
946 idx = sk_MIME_PARAM_find(hdr->params, ¶m);
949 return sk_MIME_PARAM_value(hdr->params, idx);
953 mime_hdr_free(MIME_HEADER *hdr)
958 sk_MIME_PARAM_pop_free(hdr->params, mime_param_free);
963 mime_param_free(MIME_PARAM *param)
965 free(param->param_name);
966 free(param->param_value);
970 /* Check for a multipart boundary. Returns:
976 mime_bound_check(char *line, int linelen, char *bound, int blen)
979 linelen = strlen(line);
981 blen = strlen(bound);
982 /* Quickly eliminate if line length too short */
983 if (blen + 2 > linelen)
985 /* Check for part boundary */
986 if (!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) {
987 if (!strncmp(line + blen + 2, "--", 2))
996 strip_eol(char *linebuf, int *plen)
1002 for (p = linebuf + len - 1; len > 0; len--, p--) {