Bug Summary

File:src/lib/libcrypto/asn1/asn_mime.c
Warning:line 619, column 2
Value stored to 'state' is never read

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.4 -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name asn_mime.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/lib/libcrypto/obj -resource-dir /usr/local/llvm16/lib/clang/16 -D LIBRESSL_INTERNAL -D HAVE_FUNOPEN -I /usr/src/lib/libcrypto -I /usr/src/lib/libcrypto/arch/amd64 -I /usr/src/lib/libcrypto/asn1 -I /usr/src/lib/libcrypto/bio -I /usr/src/lib/libcrypto/bn -I /usr/src/lib/libcrypto/bn/arch/amd64 -I /usr/src/lib/libcrypto/bytestring -I /usr/src/lib/libcrypto/curve25519 -I /usr/src/lib/libcrypto/dh -I /usr/src/lib/libcrypto/dsa -I /usr/src/lib/libcrypto/ec -I /usr/src/lib/libcrypto/ecdsa -I /usr/src/lib/libcrypto/evp -I /usr/src/lib/libcrypto/hidden -I /usr/src/lib/libcrypto/hmac -I /usr/src/lib/libcrypto/kdf -I /usr/src/lib/libcrypto/modes -I /usr/src/lib/libcrypto/ocsp -I /usr/src/lib/libcrypto/pkcs12 -I /usr/src/lib/libcrypto/rsa -I /usr/src/lib/libcrypto/sha -I /usr/src/lib/libcrypto/ts -I /usr/src/lib/libcrypto/x509 -I /usr/src/lib/libcrypto/obj -D AES_ASM -D BSAES_ASM -D VPAES_ASM -D OPENSSL_IA32_SSE2 -D RSA_ASM -D OPENSSL_BN_ASM_MONT -D OPENSSL_BN_ASM_MONT5 -D MD5_ASM -D GHASH_ASM -D RC4_MD5_ASM -D SHA1_ASM -D SHA256_ASM -D SHA512_ASM -D WHIRLPOOL_ASM -D OPENSSL_CPUID_OBJ -internal-isystem /usr/local/llvm16/lib/clang/16/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/lib/libcrypto/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fcf-protection=branch -fno-jump-tables -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/scan/2024-01-11-140451-98009-1 -x c /usr/src/lib/libcrypto/asn1/asn_mime.c
1/* $OpenBSD: asn_mime.c,v 1.32 2023/07/05 21:23:36 beck Exp $ */
2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project.
4 */
5/* ====================================================================
6 * Copyright (c) 1999-2008 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
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
18 * distribution.
19 *
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/)"
24 *
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.
29 *
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.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
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 * ====================================================================
52 *
53 */
54
55#include <ctype.h>
56#include <stdio.h>
57#include <stdlib.h>
58#include <string.h>
59
60#include <openssl/asn1.h>
61#include <openssl/asn1t.h>
62#include <openssl/err.h>
63#include <openssl/x509.h>
64
65#include "asn1_local.h"
66#include "evp_local.h"
67
68/* Generalised MIME like utilities for streaming ASN1. Although many
69 * have a PKCS7/CMS like flavour others are more general purpose.
70 */
71
72/* MIME format structures
73 * Note that all are translated to lower case apart from
74 * parameter values. Quotes are stripped off
75 */
76
77typedef struct {
78 char *param_name; /* Param name e.g. "micalg" */
79 char *param_value; /* Param value e.g. "sha1" */
80} MIME_PARAM;
81
82DECLARE_STACK_OF(MIME_PARAM)struct stack_st_MIME_PARAM { _STACK stack; };
83
84typedef struct {
85 char *name; /* Name of line e.g. "content-type" */
86 char *value; /* Value of line e.g. "text/plain" */
87 STACK_OF(MIME_PARAM)struct stack_st_MIME_PARAM *params; /* Zero or more parameters */
88} MIME_HEADER;
89
90DECLARE_STACK_OF(MIME_HEADER)struct stack_st_MIME_HEADER { _STACK stack; };
91
92static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
93 const ASN1_ITEM *it);
94static char * strip_ends(char *name);
95static char * strip_start(char *name);
96static char * strip_end(char *name);
97static MIME_HEADER *mime_hdr_new(char *name, char *value);
98static int mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value);
99static STACK_OF(MIME_HEADER)struct stack_st_MIME_HEADER *mime_parse_hdr(BIO *bio);
100static int mime_hdr_cmp(const MIME_HEADER * const *a,
101 const MIME_HEADER * const *b);
102static int mime_param_cmp(const MIME_PARAM * const *a,
103 const MIME_PARAM * const *b);
104static void mime_param_free(MIME_PARAM *param);
105static int mime_bound_check(char *line, int linelen, char *bound, int blen);
106static int multi_split(BIO *bio, char *bound, STACK_OF(BIO)struct stack_st_BIO **ret);
107static int strip_eol(char *linebuf, int *plen);
108static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER)struct stack_st_MIME_HEADER *hdrs, char *name);
109static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, char *name);
110static void mime_hdr_free(MIME_HEADER *hdr);
111
112#define MAX_SMLEN1024 1024
113#define mime_debug(x) /* x */
114
115/* Output an ASN1 structure in BER format streaming if necessary */
116
117int
118i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
119 const ASN1_ITEM *it)
120{
121 /* If streaming create stream BIO and copy all content through it */
122 if (flags & SMIME_STREAM0x1000) {
123 BIO *bio, *tbio;
124 bio = BIO_new_NDEF(out, val, it);
125 if (!bio) {
126 ASN1error(ERR_R_MALLOC_FAILURE)ERR_put_error(13,(0xfff),((1|64)),"/usr/src/lib/libcrypto/asn1/asn_mime.c"
,126);
127 return 0;
128 }
129 SMIME_crlf_copy(in, bio, flags);
130 (void)BIO_flush(bio)(int)BIO_ctrl(bio,11,0,((void *)0));
131 /* Free up successive BIOs until we hit the old output BIO */
132 do {
133 tbio = BIO_pop(bio);
134 BIO_free(bio);
135 bio = tbio;
136 } while (bio != out);
137 }
138 /* else just write out ASN1 structure which will have all content
139 * stored internally
140 */
141 else
142 ASN1_item_i2d_bio(it, out, val);
143 return 1;
144}
145
146/* Base 64 read and write of ASN1 structure */
147
148static int
149B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
150 const ASN1_ITEM *it)
151{
152 BIO *b64;
153 int r;
154
155 b64 = BIO_new(BIO_f_base64());
156 if (!b64) {
157 ASN1error(ERR_R_MALLOC_FAILURE)ERR_put_error(13,(0xfff),((1|64)),"/usr/src/lib/libcrypto/asn1/asn_mime.c"
,157);
158 return 0;
159 }
160 /* prepend the b64 BIO so all data is base64 encoded.
161 */
162 out = BIO_push(b64, out);
163 r = i2d_ASN1_bio_stream(out, val, in, flags, it);
164 (void)BIO_flush(out)(int)BIO_ctrl(out,11,0,((void *)0));
165 BIO_pop(out);
166 BIO_free(b64);
167 return r;
168}
169
170/* Streaming ASN1 PEM write */
171
172int
173PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
174 const char *hdr, const ASN1_ITEM *it)
175{
176 int r;
177
178 BIO_printf(out, "-----BEGIN %s-----\n", hdr);
179 r = B64_write_ASN1(out, val, in, flags, it);
180 BIO_printf(out, "-----END %s-----\n", hdr);
181 return r;
182}
183
184static ASN1_VALUE *
185b64_read_asn1(BIO *bio, const ASN1_ITEM *it)
186{
187 BIO *b64;
188 ASN1_VALUE *val;
189 if (!(b64 = BIO_new(BIO_f_base64()))) {
190 ASN1error(ERR_R_MALLOC_FAILURE)ERR_put_error(13,(0xfff),((1|64)),"/usr/src/lib/libcrypto/asn1/asn_mime.c"
,190);
191 return 0;
192 }
193 bio = BIO_push(b64, bio);
194 val = ASN1_item_d2i_bio(it, bio, NULL((void *)0));
195 if (!val)
196 ASN1error(ASN1_R_DECODE_ERROR)ERR_put_error(13,(0xfff),(110),"/usr/src/lib/libcrypto/asn1/asn_mime.c"
,196);
197 (void)BIO_flush(bio)(int)BIO_ctrl(bio,11,0,((void *)0));
198 bio = BIO_pop(bio);
199 BIO_free(b64);
200 return val;
201}
202
203/* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */
204
205static int
206asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR)struct stack_st_X509_ALGOR *mdalgs)
207{
208 const EVP_MD *md;
209 int i, have_unknown = 0, write_comma, ret = 0, md_nid;
210
211 have_unknown = 0;
212 write_comma = 0;
213 for (i = 0; i < sk_X509_ALGOR_num(mdalgs)sk_num(((_STACK*) (1 ? (mdalgs) : (struct stack_st_X509_ALGOR
*)0))); i++) {
214 if (write_comma)
215 BIO_write(out, ",", 1);
216 write_comma = 1;
217 md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)((X509_ALGOR *)sk_value(((_STACK*) (1 ? (mdalgs) : (struct stack_st_X509_ALGOR
*)0)), (i)))->algorithm);
218 md = EVP_get_digestbynid(md_nid)EVP_get_digestbyname(OBJ_nid2sn(md_nid));
219 if (md && md->md_ctrl) {
220 int rv;
221 char *micstr;
222 rv = md->md_ctrl(NULL((void *)0), EVP_MD_CTRL_MICALG0x2, 0, &micstr);
223 if (rv > 0) {
224 BIO_puts(out, micstr);
225 free(micstr);
226 continue;
227 }
228 if (rv != -2)
229 goto err;
230 }
231 switch (md_nid) {
232 case NID_sha164:
233 BIO_puts(out, "sha1");
234 break;
235
236 case NID_md54:
237 BIO_puts(out, "md5");
238 break;
239
240 case NID_sha256672:
241 BIO_puts(out, "sha-256");
242 break;
243
244 case NID_sha384673:
245 BIO_puts(out, "sha-384");
246 break;
247
248 case NID_sha512674:
249 BIO_puts(out, "sha-512");
250 break;
251
252 case NID_id_GostR3411_94809:
253 BIO_puts(out, "gostr3411-94");
254 goto err;
255 break;
256
257 default:
258 if (have_unknown)
259 write_comma = 0;
260 else {
261 BIO_puts(out, "unknown");
262 have_unknown = 1;
263 }
264 break;
265
266 }
267 }
268
269 ret = 1;
270
271 err:
272 return ret;
273}
274
275/* SMIME sender */
276
277int
278SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
279 int ctype_nid, int econt_nid, STACK_OF(X509_ALGOR)struct stack_st_X509_ALGOR *mdalgs,
280 const ASN1_ITEM *it)
281{
282 char bound[33], c;
283 int i;
284 const char *mime_prefix, *mime_eol, *cname = "smime.p7m";
285 const char *msg_type = NULL((void *)0);
286
287 if (flags & SMIME_OLDMIME0x400)
288 mime_prefix = "application/x-pkcs7-";
289 else
290 mime_prefix = "application/pkcs7-";
291
292 if (flags & SMIME_CRLFEOL0x800)
293 mime_eol = "\r\n";
294 else
295 mime_eol = "\n";
296 if ((flags & SMIME_DETACHED0x40) && data) {
297 /* We want multipart/signed */
298 /* Generate a random boundary */
299 arc4random_buf(bound, 32);
300 for (i = 0; i < 32; i++) {
301 c = bound[i] & 0xf;
302 if (c < 10)
303 c += '0';
304 else
305 c += 'A' - 10;
306 bound[i] = c;
307 }
308 bound[32] = 0;
309 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
310 BIO_printf(bio, "Content-Type: multipart/signed;");
311 BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);
312 BIO_puts(bio, " micalg=\"");
313 asn1_write_micalg(bio, mdalgs);
314 BIO_printf(bio, "\"; boundary=\"----%s\"%s%s",
315 bound, mime_eol, mime_eol);
316 BIO_printf(bio, "This is an S/MIME signed message%s%s",
317 mime_eol, mime_eol);
318 /* Now write out the first part */
319 BIO_printf(bio, "------%s%s", bound, mime_eol);
320 if (!asn1_output_data(bio, data, val, flags, it))
321 return 0;
322 BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);
323
324 /* Headers for signature */
325
326 BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix);
327 BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);
328 BIO_printf(bio, "Content-Transfer-Encoding: base64%s",
329 mime_eol);
330 BIO_printf(bio, "Content-Disposition: attachment;");
331 BIO_printf(bio, " filename=\"smime.p7s\"%s%s",
332 mime_eol, mime_eol);
333 B64_write_ASN1(bio, val, NULL((void *)0), 0, it);
334 BIO_printf(bio, "%s------%s--%s%s", mime_eol, bound,
335 mime_eol, mime_eol);
336 return 1;
337 }
338
339 /* Determine smime-type header */
340
341 if (ctype_nid == NID_pkcs7_enveloped23)
342 msg_type = "enveloped-data";
343 else if (ctype_nid == NID_pkcs7_signed22) {
344 if (econt_nid == NID_id_smime_ct_receipt204)
345 msg_type = "signed-receipt";
346 else if (sk_X509_ALGOR_num(mdalgs)sk_num(((_STACK*) (1 ? (mdalgs) : (struct stack_st_X509_ALGOR
*)0))) >= 0)
347 msg_type = "signed-data";
348 else
349 msg_type = "certs-only";
350 } else if (ctype_nid == NID_id_smime_ct_compressedData786) {
351 msg_type = "compressed-data";
352 cname = "smime.p7z";
353 }
354 /* MIME headers */
355 BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
356 BIO_printf(bio, "Content-Disposition: attachment;");
357 BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol);
358 BIO_printf(bio, "Content-Type: %smime;", mime_prefix);
359 if (msg_type)
360 BIO_printf(bio, " smime-type=%s;", msg_type);
361 BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol);
362 BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",
363 mime_eol, mime_eol);
364 if (!B64_write_ASN1(bio, val, data, flags, it))
365 return 0;
366 BIO_printf(bio, "%s", mime_eol);
367 return 1;
368}
369
370/* Handle output of ASN1 data */
371
372
373static int
374asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
375 const ASN1_ITEM *it)
376{
377 BIO *tmpbio;
378 const ASN1_AUX *aux = it->funcs;
379 ASN1_STREAM_ARG sarg;
380 int rv = 1;
381
382 /* If data is not deteched or resigning then the output BIO is
383 * already set up to finalise when it is written through.
384 */
385 if (!(flags & SMIME_DETACHED0x40) || (flags & PKCS7_REUSE_DIGEST0x8000)) {
386 SMIME_crlf_copy(data, out, flags);
387 return 1;
388 }
389
390 if (!aux || !aux->asn1_cb) {
391 ASN1error(ASN1_R_STREAMING_NOT_SUPPORTED)ERR_put_error(13,(0xfff),(202),"/usr/src/lib/libcrypto/asn1/asn_mime.c"
,391);
392 return 0;
393 }
394
395 sarg.out = out;
396 sarg.ndef_bio = NULL((void *)0);
397 sarg.boundary = NULL((void *)0);
398
399 /* Let ASN1 code prepend any needed BIOs */
400
401 if (aux->asn1_cb(ASN1_OP_DETACHED_PRE12, &val, it, &sarg) <= 0)
402 return 0;
403
404 /* Copy data across, passing through filter BIOs for processing */
405 SMIME_crlf_copy(data, sarg.ndef_bio, flags);
406
407 /* Finalize structure */
408 if (aux->asn1_cb(ASN1_OP_DETACHED_POST13, &val, it, &sarg) <= 0)
409 rv = 0;
410
411 /* Now remove any digests prepended to the BIO */
412
413 while (sarg.ndef_bio != out) {
414 tmpbio = BIO_pop(sarg.ndef_bio);
415 BIO_free(sarg.ndef_bio);
416 sarg.ndef_bio = tmpbio;
417 }
418
419 return rv;
420}
421
422/* SMIME reader: handle multipart/signed and opaque signing.
423 * in multipart case the content is placed in a memory BIO
424 * pointed to by "bcont". In opaque this is set to NULL
425 */
426
427ASN1_VALUE *
428SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it)
429{
430 BIO *asnin;
431 STACK_OF(MIME_HEADER)struct stack_st_MIME_HEADER *headers = NULL((void *)0);
432 STACK_OF(BIO)struct stack_st_BIO *parts = NULL((void *)0);
433 MIME_HEADER *hdr;
434 MIME_PARAM *prm;
435 ASN1_VALUE *val;
436 int ret;
437
438 if (bcont)
439 *bcont = NULL((void *)0);
440
441 if (!(headers = mime_parse_hdr(bio))) {
442 ASN1error(ASN1_R_MIME_PARSE_ERROR)ERR_put_error(13,(0xfff),(207),"/usr/src/lib/libcrypto/asn1/asn_mime.c"
,442);
443 return NULL((void *)0);
444 }
445
446 if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
447 sk_MIME_HEADER_pop_free(headers, mime_hdr_free)sk_pop_free(((_STACK*) (1 ? (headers) : (struct stack_st_MIME_HEADER
*)0)), ((void (*)(void *)) ((1 ? (mime_hdr_free) : (void (*)(
MIME_HEADER *))0))));
448 ASN1error(ASN1_R_NO_CONTENT_TYPE)ERR_put_error(13,(0xfff),(209),"/usr/src/lib/libcrypto/asn1/asn_mime.c"
,448);
449 return NULL((void *)0);
450 }
451
452 /* Handle multipart/signed */
453
454 if (!strcmp(hdr->value, "multipart/signed")) {
455 /* Split into two parts */
456 prm = mime_param_find(hdr, "boundary");
457 if (!prm || !prm->param_value) {
458 sk_MIME_HEADER_pop_free(headers, mime_hdr_free)sk_pop_free(((_STACK*) (1 ? (headers) : (struct stack_st_MIME_HEADER
*)0)), ((void (*)(void *)) ((1 ? (mime_hdr_free) : (void (*)(
MIME_HEADER *))0))));
459 ASN1error(ASN1_R_NO_MULTIPART_BOUNDARY)ERR_put_error(13,(0xfff),(211),"/usr/src/lib/libcrypto/asn1/asn_mime.c"
,459);
460 return NULL((void *)0);
461 }
462 ret = multi_split(bio, prm->param_value, &parts);
463 sk_MIME_HEADER_pop_free(headers, mime_hdr_free)sk_pop_free(((_STACK*) (1 ? (headers) : (struct stack_st_MIME_HEADER
*)0)), ((void (*)(void *)) ((1 ? (mime_hdr_free) : (void (*)(
MIME_HEADER *))0))));
464 if (!ret || (sk_BIO_num(parts)sk_num(((_STACK*) (1 ? (parts) : (struct stack_st_BIO*)0))) != 2) ) {
465 ASN1error(ASN1_R_NO_MULTIPART_BODY_FAILURE)ERR_put_error(13,(0xfff),(210),"/usr/src/lib/libcrypto/asn1/asn_mime.c"
,465);
466 sk_BIO_pop_free(parts, BIO_vfree)sk_pop_free(((_STACK*) (1 ? (parts) : (struct stack_st_BIO*)0
)), ((void (*)(void *)) ((1 ? (BIO_vfree) : (void (*)(BIO *))
0))));
467 return NULL((void *)0);
468 }
469
470 /* Parse the signature piece */
471 asnin = sk_BIO_value(parts, 1)((BIO *)sk_value(((_STACK*) (1 ? (parts) : (struct stack_st_BIO
*)0)), (1)));
472
473 if (!(headers = mime_parse_hdr(asnin))) {
474 ASN1error(ASN1_R_MIME_SIG_PARSE_ERROR)ERR_put_error(13,(0xfff),(208),"/usr/src/lib/libcrypto/asn1/asn_mime.c"
,474);
475 sk_BIO_pop_free(parts, BIO_vfree)sk_pop_free(((_STACK*) (1 ? (parts) : (struct stack_st_BIO*)0
)), ((void (*)(void *)) ((1 ? (BIO_vfree) : (void (*)(BIO *))
0))));
476 return NULL((void *)0);
477 }
478
479 /* Get content type */
480
481 if (!(hdr = mime_hdr_find(headers, "content-type")) ||
482 !hdr->value) {
483 sk_MIME_HEADER_pop_free(headers, mime_hdr_free)sk_pop_free(((_STACK*) (1 ? (headers) : (struct stack_st_MIME_HEADER
*)0)), ((void (*)(void *)) ((1 ? (mime_hdr_free) : (void (*)(
MIME_HEADER *))0))));
484 sk_BIO_pop_free(parts, BIO_vfree)sk_pop_free(((_STACK*) (1 ? (parts) : (struct stack_st_BIO*)0
)), ((void (*)(void *)) ((1 ? (BIO_vfree) : (void (*)(BIO *))
0))));
485 ASN1error(ASN1_R_NO_SIG_CONTENT_TYPE)ERR_put_error(13,(0xfff),(212),"/usr/src/lib/libcrypto/asn1/asn_mime.c"
,485);
486 return NULL((void *)0);
487 }
488
489 if (strcmp(hdr->value, "application/x-pkcs7-signature") &&
490 strcmp(hdr->value, "application/pkcs7-signature")) {
491 ASN1error(ASN1_R_SIG_INVALID_MIME_TYPE)ERR_put_error(13,(0xfff),(213),"/usr/src/lib/libcrypto/asn1/asn_mime.c"
,491);
492 ERR_asprintf_error_data("type: %s", hdr->value);
493 sk_MIME_HEADER_pop_free(headers, mime_hdr_free)sk_pop_free(((_STACK*) (1 ? (headers) : (struct stack_st_MIME_HEADER
*)0)), ((void (*)(void *)) ((1 ? (mime_hdr_free) : (void (*)(
MIME_HEADER *))0))));
494 sk_BIO_pop_free(parts, BIO_vfree)sk_pop_free(((_STACK*) (1 ? (parts) : (struct stack_st_BIO*)0
)), ((void (*)(void *)) ((1 ? (BIO_vfree) : (void (*)(BIO *))
0))));
495 return NULL((void *)0);
496 }
497 sk_MIME_HEADER_pop_free(headers, mime_hdr_free)sk_pop_free(((_STACK*) (1 ? (headers) : (struct stack_st_MIME_HEADER
*)0)), ((void (*)(void *)) ((1 ? (mime_hdr_free) : (void (*)(
MIME_HEADER *))0))));
498 /* Read in ASN1 */
499 if (!(val = b64_read_asn1(asnin, it))) {
500 ASN1error(ASN1_R_ASN1_SIG_PARSE_ERROR)ERR_put_error(13,(0xfff),(204),"/usr/src/lib/libcrypto/asn1/asn_mime.c"
,500);
501 sk_BIO_pop_free(parts, BIO_vfree)sk_pop_free(((_STACK*) (1 ? (parts) : (struct stack_st_BIO*)0
)), ((void (*)(void *)) ((1 ? (BIO_vfree) : (void (*)(BIO *))
0))));
502 return NULL((void *)0);
503 }
504
505 if (bcont) {
506 *bcont = sk_BIO_value(parts, 0)((BIO *)sk_value(((_STACK*) (1 ? (parts) : (struct stack_st_BIO
*)0)), (0)));
507 BIO_free(asnin);
508 sk_BIO_free(parts)sk_free(((_STACK*) (1 ? (parts) : (struct stack_st_BIO*)0)));
509 } else sk_BIO_pop_free(parts, BIO_vfree)sk_pop_free(((_STACK*) (1 ? (parts) : (struct stack_st_BIO*)0
)), ((void (*)(void *)) ((1 ? (BIO_vfree) : (void (*)(BIO *))
0))));
510 return val;
511 }
512
513 /* OK, if not multipart/signed try opaque signature */
514
515 if (strcmp (hdr->value, "application/x-pkcs7-mime") &&
516 strcmp (hdr->value, "application/pkcs7-mime")) {
517 ASN1error(ASN1_R_INVALID_MIME_TYPE)ERR_put_error(13,(0xfff),(205),"/usr/src/lib/libcrypto/asn1/asn_mime.c"
,517);
518 ERR_asprintf_error_data("type: %s", hdr->value);
519 sk_MIME_HEADER_pop_free(headers, mime_hdr_free)sk_pop_free(((_STACK*) (1 ? (headers) : (struct stack_st_MIME_HEADER
*)0)), ((void (*)(void *)) ((1 ? (mime_hdr_free) : (void (*)(
MIME_HEADER *))0))));
520 return NULL((void *)0);
521 }
522
523 sk_MIME_HEADER_pop_free(headers, mime_hdr_free)sk_pop_free(((_STACK*) (1 ? (headers) : (struct stack_st_MIME_HEADER
*)0)), ((void (*)(void *)) ((1 ? (mime_hdr_free) : (void (*)(
MIME_HEADER *))0))));
524
525 if (!(val = b64_read_asn1(bio, it))) {
526 ASN1error(ASN1_R_ASN1_PARSE_ERROR)ERR_put_error(13,(0xfff),(203),"/usr/src/lib/libcrypto/asn1/asn_mime.c"
,526);
527 return NULL((void *)0);
528 }
529 return val;
530}
531
532/* Copy text from one BIO to another making the output CRLF at EOL */
533int
534SMIME_crlf_copy(BIO *in, BIO *out, int flags)
535{
536 BIO *bf;
537 char eol;
538 int len;
539 char linebuf[MAX_SMLEN1024];
540
541 /* Buffer output so we don't write one line at a time. This is
542 * useful when streaming as we don't end up with one OCTET STRING
543 * per line.
544 */
545 bf = BIO_new(BIO_f_buffer());
546 if (!bf)
547 return 0;
548 out = BIO_push(bf, out);
549 if (flags & SMIME_BINARY0x80) {
550 while ((len = BIO_read(in, linebuf, MAX_SMLEN1024)) > 0)
551 BIO_write(out, linebuf, len);
552 } else {
553 if (flags & SMIME_TEXT0x1)
554 BIO_printf(out, "Content-Type: text/plain\r\n\r\n");
555 while ((len = BIO_gets(in, linebuf, MAX_SMLEN1024)) > 0) {
556 eol = strip_eol(linebuf, &len);
557 if (len)
558 BIO_write(out, linebuf, len);
559 if (eol)
560 BIO_write(out, "\r\n", 2);
561 }
562 }
563 (void)BIO_flush(out)(int)BIO_ctrl(out,11,0,((void *)0));
564 BIO_pop(out);
565 BIO_free(bf);
566 return 1;
567}
568LCRYPTO_ALIAS(SMIME_crlf_copy)asm("");
569
570/* Strip off headers if they are text/plain */
571int
572SMIME_text(BIO *in, BIO *out)
573{
574 char iobuf[4096];
575 int len;
576 STACK_OF(MIME_HEADER)struct stack_st_MIME_HEADER *headers;
577 MIME_HEADER *hdr;
578
579 if (!(headers = mime_parse_hdr(in))) {
580 ASN1error(ASN1_R_MIME_PARSE_ERROR)ERR_put_error(13,(0xfff),(207),"/usr/src/lib/libcrypto/asn1/asn_mime.c"
,580);
581 return 0;
582 }
583 if (!(hdr = mime_hdr_find(headers, "content-type")) || !hdr->value) {
584 ASN1error(ASN1_R_MIME_NO_CONTENT_TYPE)ERR_put_error(13,(0xfff),(206),"/usr/src/lib/libcrypto/asn1/asn_mime.c"
,584);
585 sk_MIME_HEADER_pop_free(headers, mime_hdr_free)sk_pop_free(((_STACK*) (1 ? (headers) : (struct stack_st_MIME_HEADER
*)0)), ((void (*)(void *)) ((1 ? (mime_hdr_free) : (void (*)(
MIME_HEADER *))0))));
586 return 0;
587 }
588 if (strcmp (hdr->value, "text/plain")) {
589 ASN1error(ASN1_R_INVALID_MIME_TYPE)ERR_put_error(13,(0xfff),(205),"/usr/src/lib/libcrypto/asn1/asn_mime.c"
,589);
590 ERR_asprintf_error_data("type: %s", hdr->value);
591 sk_MIME_HEADER_pop_free(headers, mime_hdr_free)sk_pop_free(((_STACK*) (1 ? (headers) : (struct stack_st_MIME_HEADER
*)0)), ((void (*)(void *)) ((1 ? (mime_hdr_free) : (void (*)(
MIME_HEADER *))0))));
592 return 0;
593 }
594 sk_MIME_HEADER_pop_free(headers, mime_hdr_free)sk_pop_free(((_STACK*) (1 ? (headers) : (struct stack_st_MIME_HEADER
*)0)), ((void (*)(void *)) ((1 ? (mime_hdr_free) : (void (*)(
MIME_HEADER *))0))));
595 while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)
596 BIO_write(out, iobuf, len);
597 if (len < 0)
598 return 0;
599 return 1;
600}
601LCRYPTO_ALIAS(SMIME_text)asm("");
602
603/*
604 * Split a multipart/XXX message body into component parts: result is
605 * canonical parts in a STACK of bios
606 */
607static int
608multi_split(BIO *bio, char *bound, STACK_OF(BIO)struct stack_st_BIO **ret)
609{
610 char linebuf[MAX_SMLEN1024];
611 int len, blen;
612 int eol = 0, next_eol = 0;
613 BIO *bpart = NULL((void *)0);
614 STACK_OF(BIO)struct stack_st_BIO *parts;
615 char state, part, first;
616
617 blen = strlen(bound);
618 part = 0;
619 state = 0;
Value stored to 'state' is never read
620 first = 1;
621 parts = sk_BIO_new_null()((struct stack_st_BIO *)sk_new_null());
622 *ret = parts;
623 if (parts == NULL((void *)0))
624 return 0;
625 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN1024)) > 0) {
626 state = mime_bound_check(linebuf, len, bound, blen);
627 if (state == 1) {
628 first = 1;
629 part++;
630 } else if (state == 2) {
631 if (sk_BIO_push(parts, bpart)sk_push(((_STACK*) (1 ? (parts) : (struct stack_st_BIO*)0)), (
(void*) (1 ? (bpart) : (BIO*)0))) == 0)
632 return 0;
633 return 1;
634 } else if (part) {
635 /* Strip CR+LF from linebuf */
636 next_eol = strip_eol(linebuf, &len);
637 if (first) {
638 first = 0;
639 if (bpart != NULL((void *)0)) {
640 if (sk_BIO_push(parts, bpart)sk_push(((_STACK*) (1 ? (parts) : (struct stack_st_BIO*)0)), (
(void*) (1 ? (bpart) : (BIO*)0))) == 0)
641 return 0;
642 }
643 bpart = BIO_new(BIO_s_mem());
644 if (bpart == NULL((void *)0))
645 return 0;
646 BIO_set_mem_eof_return(bpart, 0)BIO_ctrl(bpart,130,0,((void *)0));
647 } else if (eol)
648 BIO_write(bpart, "\r\n", 2);
649 eol = next_eol;
650 if (len)
651 BIO_write(bpart, linebuf, len);
652 }
653 }
654 BIO_free(bpart);
655 return 0;
656}
657
658/* This is the big one: parse MIME header lines up to message body */
659
660#define MIME_INVALID0 0
661#define MIME_START1 1
662#define MIME_TYPE2 2
663#define MIME_NAME3 3
664#define MIME_VALUE4 4
665#define MIME_QUOTE5 5
666#define MIME_COMMENT6 6
667
668static STACK_OF(MIME_HEADER)struct stack_st_MIME_HEADER *
669mime_parse_hdr(BIO *bio)
670{
671 char *p, *q, c;
672 char *ntmp;
673 char linebuf[MAX_SMLEN1024];
674 MIME_HEADER *mhdr = NULL((void *)0);
675 STACK_OF(MIME_HEADER)struct stack_st_MIME_HEADER *headers;
676 int len, state, save_state = 0;
677
678 headers = sk_MIME_HEADER_new(mime_hdr_cmp)((struct stack_st_MIME_HEADER *)sk_new(((int (*)(const void *
, const void *)) ((1 ? (mime_hdr_cmp) : (int (*)(const MIME_HEADER
* const *, const MIME_HEADER * const *))0)))));
679 if (!headers)
680 return NULL((void *)0);
681 while ((len = BIO_gets(bio, linebuf, MAX_SMLEN1024)) > 0) {
682 /* If whitespace at line start then continuation line */
683 if (mhdr && isspace((unsigned char)linebuf[0]))
684 state = MIME_NAME3;
685 else
686 state = MIME_START1;
687 ntmp = NULL((void *)0);
688
689 /* Go through all characters */
690 for (p = linebuf, q = linebuf;
691 (c = *p) && (c != '\r') && (c != '\n'); p++) {
692
693 /* State machine to handle MIME headers
694 * if this looks horrible that's because it *is*
695 */
696
697 switch (state) {
698 case MIME_START1:
699 if (c == ':') {
700 state = MIME_TYPE2;
701 *p = 0;
702 ntmp = strip_ends(q);
703 q = p + 1;
704 }
705 break;
706
707 case MIME_TYPE2:
708 if (c == ';') {
709 mime_debug("Found End Value\n");
710 *p = 0;
711 mhdr = mime_hdr_new(ntmp,
712 strip_ends(q));
713 if (mhdr == NULL((void *)0))
714 goto merr;
715 if (sk_MIME_HEADER_push(headers,sk_push(((_STACK*) (1 ? (headers) : (struct stack_st_MIME_HEADER
*)0)), ((void*) (1 ? (mhdr) : (MIME_HEADER*)0)))
716 mhdr)sk_push(((_STACK*) (1 ? (headers) : (struct stack_st_MIME_HEADER
*)0)), ((void*) (1 ? (mhdr) : (MIME_HEADER*)0))) == 0)
717 goto merr;
718 ntmp = NULL((void *)0);
719 q = p + 1;
720 state = MIME_NAME3;
721 } else if (c == '(') {
722 save_state = state;
723 state = MIME_COMMENT6;
724 }
725 break;
726
727 case MIME_COMMENT6:
728 if (c == ')') {
729 state = save_state;
730 }
731 break;
732
733 case MIME_NAME3:
734 if (c == '=') {
735 state = MIME_VALUE4;
736 *p = 0;
737 ntmp = strip_ends(q);
738 q = p + 1;
739 }
740 break;
741
742 case MIME_VALUE4:
743 if (c == ';') {
744 state = MIME_NAME3;
745 *p = 0;
746 mime_hdr_addparam(mhdr, ntmp,
747 strip_ends(q));
748 ntmp = NULL((void *)0);
749 q = p + 1;
750 } else if (c == '"') {
751 mime_debug("Found Quote\n");
752 state = MIME_QUOTE5;
753 } else if (c == '(') {
754 save_state = state;
755 state = MIME_COMMENT6;
756 }
757 break;
758
759 case MIME_QUOTE5:
760 if (c == '"') {
761 mime_debug("Found Match Quote\n");
762 state = MIME_VALUE4;
763 }
764 break;
765 }
766 }
767
768 if (state == MIME_TYPE2) {
769 mhdr = mime_hdr_new(ntmp, strip_ends(q));
770 if (mhdr == NULL((void *)0))
771 goto merr;
772 if (sk_MIME_HEADER_push(headers, mhdr)sk_push(((_STACK*) (1 ? (headers) : (struct stack_st_MIME_HEADER
*)0)), ((void*) (1 ? (mhdr) : (MIME_HEADER*)0))) == 0)
773 goto merr;
774 } else if (state == MIME_VALUE4)
775 mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
776
777 if (p == linebuf)
778 break; /* Blank line means end of headers */
779 }
780
781 return headers;
782
783 merr:
784 if (mhdr != NULL((void *)0))
785 mime_hdr_free(mhdr);
786 sk_MIME_HEADER_pop_free(headers, mime_hdr_free)sk_pop_free(((_STACK*) (1 ? (headers) : (struct stack_st_MIME_HEADER
*)0)), ((void (*)(void *)) ((1 ? (mime_hdr_free) : (void (*)(
MIME_HEADER *))0))));
787 return NULL((void *)0);
788}
789
790static char *
791strip_ends(char *name)
792{
793 return strip_end(strip_start(name));
794}
795
796/* Strip a parameter of whitespace from start of param */
797static char *
798strip_start(char *name)
799{
800 char *p, c;
801
802 /* Look for first non white space or quote */
803 for (p = name; (c = *p); p++) {
804 if (c == '"') {
805 /* Next char is start of string if non null */
806 if (p[1])
807 return p + 1;
808 /* Else null string */
809 return NULL((void *)0);
810 }
811 if (!isspace((unsigned char)c))
812 return p;
813 }
814 return NULL((void *)0);
815}
816
817/* As above but strip from end of string : maybe should handle brackets? */
818static char *
819strip_end(char *name)
820{
821 char *p, c;
822
823 if (!name)
824 return NULL((void *)0);
825
826 /* Look for first non white space or quote */
827 for (p = name + strlen(name) - 1; p >= name; p--) {
828 c = *p;
829 if (c == '"') {
830 if (p - 1 == name)
831 return NULL((void *)0);
832 *p = 0;
833 return name;
834 }
835 if (isspace((unsigned char)c))
836 *p = 0;
837 else
838 return name;
839 }
840 return NULL((void *)0);
841}
842
843static MIME_HEADER *
844mime_hdr_new(char *name, char *value)
845{
846 MIME_HEADER *mhdr;
847 char *tmpname = NULL((void *)0), *tmpval = NULL((void *)0), *p;
848
849 if (name) {
850 if (!(tmpname = strdup(name)))
851 goto err;
852 for (p = tmpname; *p; p++)
853 *p = tolower((unsigned char)*p);
854 }
855 if (value) {
856 if (!(tmpval = strdup(value)))
857 goto err;
858 for (p = tmpval; *p; p++)
859 *p = tolower((unsigned char)*p);
860 }
861 mhdr = malloc(sizeof(MIME_HEADER));
862 if (!mhdr)
863 goto err;
864 mhdr->name = tmpname;
865 mhdr->value = tmpval;
866 if (!(mhdr->params = sk_MIME_PARAM_new(mime_param_cmp)((struct stack_st_MIME_PARAM *)sk_new(((int (*)(const void *,
const void *)) ((1 ? (mime_param_cmp) : (int (*)(const MIME_PARAM
* const *, const MIME_PARAM * const *))0))))))) {
867 free(mhdr);
868 goto err;
869 }
870 return mhdr;
871 err:
872 free(tmpname);
873 free(tmpval);
874 return NULL((void *)0);
875}
876
877static int
878mime_hdr_addparam(MIME_HEADER *mhdr, char *name, char *value)
879{
880 char *tmpname = NULL((void *)0), *tmpval = NULL((void *)0), *p;
881 MIME_PARAM *mparam;
882
883 if (name) {
884 tmpname = strdup(name);
885 if (!tmpname)
886 goto err;
887 for (p = tmpname; *p; p++)
888 *p = tolower((unsigned char)*p);
889 }
890 if (value) {
891 tmpval = strdup(value);
892 if (!tmpval)
893 goto err;
894 }
895 /* Parameter values are case sensitive so leave as is */
896 mparam = malloc(sizeof(MIME_PARAM));
897 if (!mparam)
898 goto err;
899 mparam->param_name = tmpname;
900 mparam->param_value = tmpval;
901 if (sk_MIME_PARAM_push(mhdr->params, mparam)sk_push(((_STACK*) (1 ? (mhdr->params) : (struct stack_st_MIME_PARAM
*)0)), ((void*) (1 ? (mparam) : (MIME_PARAM*)0))) == 0) {
902 free(mparam);
903 goto err;
904 }
905 return 1;
906 err:
907 free(tmpname);
908 free(tmpval);
909 return 0;
910}
911
912static int
913mime_hdr_cmp(const MIME_HEADER * const *a, const MIME_HEADER * const *b)
914{
915 if (!(*a)->name || !(*b)->name)
916 return !!(*a)->name - !!(*b)->name;
917 return (strcmp((*a)->name, (*b)->name));
918}
919
920static int
921mime_param_cmp(const MIME_PARAM * const *a, const MIME_PARAM * const *b)
922{
923 if (!(*a)->param_name || !(*b)->param_name)
924 return !!(*a)->param_name - !!(*b)->param_name;
925 return (strcmp((*a)->param_name, (*b)->param_name));
926}
927
928/* Find a header with a given name (if possible) */
929
930static MIME_HEADER *
931mime_hdr_find(STACK_OF(MIME_HEADER)struct stack_st_MIME_HEADER *hdrs, char *name)
932{
933 MIME_HEADER htmp;
934 int idx;
935 htmp.name = name;
936 idx = sk_MIME_HEADER_find(hdrs, &htmp)sk_find(((_STACK*) (1 ? (hdrs) : (struct stack_st_MIME_HEADER
*)0)), ((void*) (1 ? (&htmp) : (MIME_HEADER*)0)));
937 if (idx < 0)
938 return NULL((void *)0);
939 return sk_MIME_HEADER_value(hdrs, idx)((MIME_HEADER *)sk_value(((_STACK*) (1 ? (hdrs) : (struct stack_st_MIME_HEADER
*)0)), (idx)));
940}
941
942static MIME_PARAM *
943mime_param_find(MIME_HEADER *hdr, char *name)
944{
945 MIME_PARAM param;
946 int idx;
947 param.param_name = name;
948 idx = sk_MIME_PARAM_find(hdr->params, &param)sk_find(((_STACK*) (1 ? (hdr->params) : (struct stack_st_MIME_PARAM
*)0)), ((void*) (1 ? (&param) : (MIME_PARAM*)0)));
949 if (idx < 0)
950 return NULL((void *)0);
951 return sk_MIME_PARAM_value(hdr->params, idx)((MIME_PARAM *)sk_value(((_STACK*) (1 ? (hdr->params) : (struct
stack_st_MIME_PARAM*)0)), (idx)));
952}
953
954static void
955mime_hdr_free(MIME_HEADER *hdr)
956{
957 free(hdr->name);
958 free(hdr->value);
959 if (hdr->params)
960 sk_MIME_PARAM_pop_free(hdr->params, mime_param_free)sk_pop_free(((_STACK*) (1 ? (hdr->params) : (struct stack_st_MIME_PARAM
*)0)), ((void (*)(void *)) ((1 ? (mime_param_free) : (void (*
)(MIME_PARAM *))0))));
961 free(hdr);
962}
963
964static void
965mime_param_free(MIME_PARAM *param)
966{
967 free(param->param_name);
968 free(param->param_value);
969 free(param);
970}
971
972/* Check for a multipart boundary. Returns:
973 * 0 : no boundary
974 * 1 : part boundary
975 * 2 : final boundary
976 */
977static int
978mime_bound_check(char *line, int linelen, char *bound, int blen)
979{
980 if (linelen == -1)
981 linelen = strlen(line);
982 if (blen == -1)
983 blen = strlen(bound);
984 /* Quickly eliminate if line length too short */
985 if (blen + 2 > linelen)
986 return 0;
987 /* Check for part boundary */
988 if (!strncmp(line, "--", 2) && !strncmp(line + 2, bound, blen)) {
989 if (!strncmp(line + blen + 2, "--", 2))
990 return 2;
991 else
992 return 1;
993 }
994 return 0;
995}
996
997static int
998strip_eol(char *linebuf, int *plen)
999{
1000 int len = *plen;
1001 char *p, c;
1002 int is_eol = 0;
1003
1004 for (p = linebuf + len - 1; len > 0; len--, p--) {
1005 c = *p;
1006 if (c == '\n')
1007 is_eol = 1;
1008 else if (c != '\r')
1009 break;
1010 }
1011 *plen = len;
1012 return is_eol;
1013}