1 7b19e0f1 2017-11-05 stsp /*
  2 72bcf0f9 2018-01-12 stsp  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
  3 7b19e0f1 2017-11-05 stsp  *
  4 7b19e0f1 2017-11-05 stsp  * Permission to use, copy, modify, and distribute this software for any
  5 7b19e0f1 2017-11-05 stsp  * purpose with or without fee is hereby granted, provided that the above
  6 7b19e0f1 2017-11-05 stsp  * copyright notice and this permission notice appear in all copies.
  7 7b19e0f1 2017-11-05 stsp  *
  8 7b19e0f1 2017-11-05 stsp  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 7b19e0f1 2017-11-05 stsp  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 7b19e0f1 2017-11-05 stsp  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 7b19e0f1 2017-11-05 stsp  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 7b19e0f1 2017-11-05 stsp  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 7b19e0f1 2017-11-05 stsp  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 7b19e0f1 2017-11-05 stsp  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 7b19e0f1 2017-11-05 stsp  */
 16 7b19e0f1 2017-11-05 stsp 
 17 91a3d81f 2018-11-11 stsp 
 18 f334529e 2018-01-12 stsp #include <errno.h>
 19 7d45c7f1 2019-05-15 stsp #include <limits.h>
 20 4cc6a5a5 2020-12-15 stsp #include <stdarg.h>
 21 8251fdbc 2018-01-12 stsp #include <stdio.h>
 22 f334529e 2018-01-12 stsp #include <stdlib.h>
 23 f334529e 2018-01-12 stsp #include <string.h>
 24 91a3d81f 2018-11-11 stsp #include <zlib.h>
 25 f334529e 2018-01-12 stsp 
 26 dd038bc6 2021-09-21 thomas.ad #include "got_compat.h"
 27 dd038bc6 2021-09-21 thomas.ad 
 28 4027f31a 2017-11-04 stsp #include "got_error.h"
 29 91a3d81f 2018-11-11 stsp #include "got_object.h"
 30 4027f31a 2017-11-04 stsp 
 31 91a3d81f 2018-11-11 stsp #include "got_lib_delta.h"
 32 91a3d81f 2018-11-11 stsp #include "got_lib_inflate.h"
 33 91a3d81f 2018-11-11 stsp #include "got_lib_object.h"
 34 91a3d81f 2018-11-11 stsp #include "got_lib_sha1.h"
 35 91a3d81f 2018-11-11 stsp 
 36 2b4402a2 2017-11-05 stsp #ifndef nitems
 37 2b4402a2 2017-11-05 stsp #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
 38 f0678b77 2021-09-21 thomas.ad #endif
 39 f0678b77 2021-09-21 thomas.ad 
 40 f0678b77 2021-09-21 thomas.ad #if defined(__GLIBC__)
 41 f0678b77 2021-09-21 thomas.ad 	/*
 42 f0678b77 2021-09-21 thomas.ad 	 * The autoconf test for strerror_r is broken in current versions
 43 f0678b77 2021-09-21 thomas.ad 	 * of autoconf: https://savannah.gnu.org/support/?110367
 44 f0678b77 2021-09-21 thomas.ad 	 */
 45 f0678b77 2021-09-21 thomas.ad #define strerror_r __xpg_strerror_r
 46 2b4402a2 2017-11-05 stsp #endif
 47 4027f31a 2017-11-04 stsp 
 48 c884fd0a 2020-12-21 stsp static struct got_custom_error {
 49 c884fd0a 2020-12-21 stsp 	struct got_error err;
 50 c884fd0a 2020-12-21 stsp 	char msg[4080];
 51 c884fd0a 2020-12-21 stsp } custom_errors[16];
 52 c884fd0a 2020-12-21 stsp 
 53 c884fd0a 2020-12-21 stsp static struct got_custom_error *
 54 c884fd0a 2020-12-21 stsp get_custom_err(void)
 55 c884fd0a 2020-12-21 stsp {
 56 c884fd0a 2020-12-21 stsp 	static unsigned int idx;
 57 c884fd0a 2020-12-21 stsp 	return &custom_errors[(idx++) % nitems(custom_errors)];
 58 c884fd0a 2020-12-21 stsp }
 59 c884fd0a 2020-12-21 stsp 
 60 4027f31a 2017-11-04 stsp const struct got_error *
 61 4027f31a 2017-11-04 stsp got_error(int code)
 62 4027f31a 2017-11-04 stsp {
 63 16aeacf7 2020-11-26 stsp 	size_t i;
 64 4027f31a 2017-11-04 stsp 
 65 4027f31a 2017-11-04 stsp 	for (i = 0; i < nitems(got_errors); i++) {
 66 4027f31a 2017-11-04 stsp 		if (code == got_errors[i].code)
 67 4027f31a 2017-11-04 stsp 			return &got_errors[i];
 68 4027f31a 2017-11-04 stsp 	}
 69 4027f31a 2017-11-04 stsp 
 70 f334529e 2018-01-12 stsp 	abort();
 71 4027f31a 2017-11-04 stsp }
 72 f334529e 2018-01-12 stsp 
 73 f334529e 2018-01-12 stsp const struct got_error *
 74 91a3d81f 2018-11-11 stsp got_error_msg(int code, const char *msg)
 75 91a3d81f 2018-11-11 stsp {
 76 c884fd0a 2020-12-21 stsp 	struct got_custom_error *cerr = get_custom_err();
 77 c884fd0a 2020-12-21 stsp 	struct got_error *err = &cerr->err;
 78 16aeacf7 2020-11-26 stsp 	size_t i;
 79 91a3d81f 2018-11-11 stsp 
 80 91a3d81f 2018-11-11 stsp 	for (i = 0; i < nitems(got_errors); i++) {
 81 91a3d81f 2018-11-11 stsp 		if (code == got_errors[i].code) {
 82 c884fd0a 2020-12-21 stsp 			err->code = code;
 83 c884fd0a 2020-12-21 stsp 			strlcpy(cerr->msg, msg, sizeof(cerr->msg));
 84 c884fd0a 2020-12-21 stsp 			err->msg = cerr->msg;
 85 c884fd0a 2020-12-21 stsp 			return err;
 86 91a3d81f 2018-11-11 stsp 		}
 87 91a3d81f 2018-11-11 stsp 	}
 88 91a3d81f 2018-11-11 stsp 
 89 91a3d81f 2018-11-11 stsp 	abort();
 90 91a3d81f 2018-11-11 stsp }
 91 91a3d81f 2018-11-11 stsp 
 92 91a3d81f 2018-11-11 stsp const struct got_error *
 93 638f9024 2019-05-13 stsp got_error_from_errno(const char *prefix)
 94 f334529e 2018-01-12 stsp {
 95 c884fd0a 2020-12-21 stsp 	struct got_custom_error *cerr = get_custom_err();
 96 c884fd0a 2020-12-21 stsp 	struct got_error *err = &cerr->err;
 97 9a02f8b7 2020-12-21 stsp 	char strerr[128];
 98 f334529e 2018-01-12 stsp 
 99 9a02f8b7 2020-12-21 stsp 	strerror_r(errno, strerr, sizeof(strerr));
100 9a02f8b7 2020-12-21 stsp 	snprintf(cerr->msg, sizeof(cerr->msg), "%s: %s", prefix, strerr);
101 230a42bd 2019-05-11 jcs 
102 c884fd0a 2020-12-21 stsp 	err->code = GOT_ERR_ERRNO;
103 c884fd0a 2020-12-21 stsp 	err->msg = cerr->msg;
104 c884fd0a 2020-12-21 stsp 	return err;
105 f334529e 2018-01-12 stsp }
106 8251fdbc 2018-01-12 stsp 
107 8251fdbc 2018-01-12 stsp const struct got_error *
108 638f9024 2019-05-13 stsp got_error_from_errno2(const char *prefix, const char *prefix2)
109 48b8b0eb 2019-05-11 jcs {
110 c884fd0a 2020-12-21 stsp 	struct got_custom_error *cerr = get_custom_err();
111 c884fd0a 2020-12-21 stsp 	struct got_error *err = &cerr->err;
112 9a02f8b7 2020-12-21 stsp 	char strerr[128];
113 48b8b0eb 2019-05-11 jcs 
114 9a02f8b7 2020-12-21 stsp 	strerror_r(errno, strerr, sizeof(strerr));
115 c884fd0a 2020-12-21 stsp 	snprintf(cerr->msg, sizeof(cerr->msg), "%s: %s: %s", prefix, prefix2,
116 9a02f8b7 2020-12-21 stsp 	    strerr);
117 48b8b0eb 2019-05-11 jcs 
118 c884fd0a 2020-12-21 stsp 	err->code = GOT_ERR_ERRNO;
119 c884fd0a 2020-12-21 stsp 	err->msg = cerr->msg;
120 c884fd0a 2020-12-21 stsp 	return err;
121 48b8b0eb 2019-05-11 jcs }
122 48b8b0eb 2019-05-11 jcs 
123 48b8b0eb 2019-05-11 jcs const struct got_error *
124 638f9024 2019-05-13 stsp got_error_from_errno3(const char *prefix, const char *prefix2,
125 230a42bd 2019-05-11 jcs     const char *prefix3)
126 230a42bd 2019-05-11 jcs {
127 c884fd0a 2020-12-21 stsp 	struct got_custom_error *cerr = get_custom_err();
128 c884fd0a 2020-12-21 stsp 	struct got_error *err = &cerr->err;
129 9a02f8b7 2020-12-21 stsp 	char strerr[128];
130 230a42bd 2019-05-11 jcs 
131 9a02f8b7 2020-12-21 stsp 	strerror_r(errno, strerr, sizeof(strerr));
132 c884fd0a 2020-12-21 stsp 	snprintf(cerr->msg, sizeof(cerr->msg), "%s: %s: %s: %s", prefix,
133 9a02f8b7 2020-12-21 stsp 	    prefix2, prefix3, strerr);
134 230a42bd 2019-05-11 jcs 
135 c884fd0a 2020-12-21 stsp 	err->code = GOT_ERR_ERRNO;
136 c884fd0a 2020-12-21 stsp 	err->msg = cerr->msg;
137 c884fd0a 2020-12-21 stsp 	return err;
138 230a42bd 2019-05-11 jcs }
139 230a42bd 2019-05-11 jcs 
140 230a42bd 2019-05-11 jcs const struct got_error *
141 4cc6a5a5 2020-12-15 stsp got_error_from_errno_fmt(const char *fmt, ...)
142 4cc6a5a5 2020-12-15 stsp {
143 c884fd0a 2020-12-21 stsp 	struct got_custom_error *cerr = get_custom_err();
144 c884fd0a 2020-12-21 stsp 	struct got_error *err = &cerr->err;
145 4cc6a5a5 2020-12-15 stsp 	char buf[PATH_MAX * 4];
146 9a02f8b7 2020-12-21 stsp 	char strerr[128];
147 4cc6a5a5 2020-12-15 stsp 	va_list ap;
148 4cc6a5a5 2020-12-15 stsp 
149 4cc6a5a5 2020-12-15 stsp 	va_start(ap, fmt);
150 4cc6a5a5 2020-12-15 stsp 	vsnprintf(buf, sizeof(buf), fmt, ap);
151 4cc6a5a5 2020-12-15 stsp 	va_end(ap);
152 4cc6a5a5 2020-12-15 stsp 
153 9a02f8b7 2020-12-21 stsp 	strerror_r(errno, strerr, sizeof(strerr));
154 9a02f8b7 2020-12-21 stsp 	snprintf(cerr->msg, sizeof(cerr->msg), "%s: %s", buf, strerr);
155 4cc6a5a5 2020-12-15 stsp 
156 c884fd0a 2020-12-21 stsp 	err->code = GOT_ERR_ERRNO;
157 c884fd0a 2020-12-21 stsp 	err->msg = cerr->msg;
158 c884fd0a 2020-12-21 stsp 	return err;
159 4cc6a5a5 2020-12-15 stsp }
160 4cc6a5a5 2020-12-15 stsp 
161 4cc6a5a5 2020-12-15 stsp const struct got_error *
162 2af4a041 2019-05-11 jcs got_error_set_errno(int code, const char *prefix)
163 1a76625f 2018-10-22 stsp {
164 1a76625f 2018-10-22 stsp 	errno = code;
165 638f9024 2019-05-13 stsp 	return got_error_from_errno(prefix);
166 1a76625f 2018-10-22 stsp }
167 1a76625f 2018-10-22 stsp 
168 1a76625f 2018-10-22 stsp const struct got_error *
169 8251fdbc 2018-01-12 stsp got_ferror(FILE *f, int code)
170 8251fdbc 2018-01-12 stsp {
171 8251fdbc 2018-01-12 stsp 	if (ferror(f))
172 638f9024 2019-05-13 stsp 		return got_error_from_errno("");
173 8251fdbc 2018-01-12 stsp 	return got_error(code);
174 8251fdbc 2018-01-12 stsp }
175 91a3d81f 2018-11-11 stsp 
176 91a3d81f 2018-11-11 stsp const struct got_error *
177 91a3d81f 2018-11-11 stsp got_error_no_obj(struct got_object_id *id)
178 91a3d81f 2018-11-11 stsp {
179 c884fd0a 2020-12-21 stsp 	char msg[sizeof("object   not found") + SHA1_DIGEST_STRING_LENGTH];
180 91a3d81f 2018-11-11 stsp 	char id_str[SHA1_DIGEST_STRING_LENGTH];
181 91a3d81f 2018-11-11 stsp 	int ret;
182 91a3d81f 2018-11-11 stsp 
183 91a3d81f 2018-11-11 stsp 	if (!got_sha1_digest_to_str(id->sha1, id_str, sizeof(id_str)))
184 91a3d81f 2018-11-11 stsp 		return got_error(GOT_ERR_NO_OBJ);
185 91a3d81f 2018-11-11 stsp 
186 91a3d81f 2018-11-11 stsp 	ret = snprintf(msg, sizeof(msg), "object %s not found", id_str);
187 91a3d81f 2018-11-11 stsp 	if (ret == -1 || ret >= sizeof(msg))
188 91a3d81f 2018-11-11 stsp 		return got_error(GOT_ERR_NO_OBJ);
189 91a3d81f 2018-11-11 stsp 
190 91a3d81f 2018-11-11 stsp 	return got_error_msg(GOT_ERR_NO_OBJ, msg);
191 91a3d81f 2018-11-11 stsp }
192 2aa0475c 2019-02-03 stsp 
193 2aa0475c 2019-02-03 stsp const struct got_error *
194 2aa0475c 2019-02-03 stsp got_error_not_ref(const char *refname)
195 2aa0475c 2019-02-03 stsp {
196 c884fd0a 2020-12-21 stsp 	char msg[sizeof("reference   not found") + 1004];
197 2aa0475c 2019-02-03 stsp 	int ret;
198 2aa0475c 2019-02-03 stsp 
199 2aa0475c 2019-02-03 stsp 	ret = snprintf(msg, sizeof(msg), "reference %s not found", refname);
200 2aa0475c 2019-02-03 stsp 	if (ret == -1 || ret >= sizeof(msg))
201 2aa0475c 2019-02-03 stsp 		return got_error(GOT_ERR_NOT_REF);
202 2aa0475c 2019-02-03 stsp 
203 2aa0475c 2019-02-03 stsp 	return got_error_msg(GOT_ERR_NOT_REF, msg);
204 2aa0475c 2019-02-03 stsp }
205 09589288 2019-03-10 stsp 
206 09589288 2019-03-10 stsp const struct got_error *
207 cc483380 2019-09-01 stsp got_error_uuid(uint32_t uuid_status, const char *prefix)
208 09589288 2019-03-10 stsp {
209 09589288 2019-03-10 stsp 	switch (uuid_status) {
210 09589288 2019-03-10 stsp 	case uuid_s_ok:
211 09589288 2019-03-10 stsp 		return NULL;
212 09589288 2019-03-10 stsp 	case uuid_s_bad_version:
213 09589288 2019-03-10 stsp 		return got_error(GOT_ERR_UUID_VERSION);
214 09589288 2019-03-10 stsp 	case uuid_s_invalid_string_uuid:
215 09589288 2019-03-10 stsp 		return got_error(GOT_ERR_UUID_INVALID);
216 09589288 2019-03-10 stsp 	case uuid_s_no_memory:
217 cc483380 2019-09-01 stsp 		return got_error_set_errno(ENOMEM, prefix);
218 09589288 2019-03-10 stsp 	default:
219 09589288 2019-03-10 stsp 		return got_error(GOT_ERR_UUID);
220 09589288 2019-03-10 stsp 	}
221 09589288 2019-03-10 stsp }
222 df056ada 2019-05-15 stsp 
223 df056ada 2019-05-15 stsp const struct got_error *
224 df056ada 2019-05-15 stsp got_error_path(const char *path, int code)
225 df056ada 2019-05-15 stsp {
226 c884fd0a 2020-12-21 stsp 	struct got_custom_error *cerr = get_custom_err();
227 c884fd0a 2020-12-21 stsp 	struct got_error *err = &cerr->err;
228 16aeacf7 2020-11-26 stsp 	size_t i;
229 df056ada 2019-05-15 stsp 
230 df056ada 2019-05-15 stsp 	for (i = 0; i < nitems(got_errors); i++) {
231 df056ada 2019-05-15 stsp 		if (code == got_errors[i].code) {
232 c884fd0a 2020-12-21 stsp 			err->code = code;
233 c884fd0a 2020-12-21 stsp 			snprintf(cerr->msg, sizeof(cerr->msg), "%s: %s", path,
234 df056ada 2019-05-15 stsp 			    got_errors[i].msg);
235 c884fd0a 2020-12-21 stsp 			err->msg = cerr->msg;
236 c884fd0a 2020-12-21 stsp 			return err;
237 df056ada 2019-05-15 stsp 		}
238 df056ada 2019-05-15 stsp 	}
239 df056ada 2019-05-15 stsp 
240 df056ada 2019-05-15 stsp 	abort();
241 df056ada 2019-05-15 stsp }
242 73e7eb7d 2020-12-15 stsp 
243 73e7eb7d 2020-12-15 stsp const struct got_error *
244 73e7eb7d 2020-12-15 stsp got_error_fmt(int code, const char *fmt, ...)
245 73e7eb7d 2020-12-15 stsp {
246 c884fd0a 2020-12-21 stsp 	struct got_custom_error *cerr = get_custom_err();
247 c884fd0a 2020-12-21 stsp 	struct got_error *err = &cerr->err;
248 73e7eb7d 2020-12-15 stsp 	char buf[PATH_MAX * 4];
249 73e7eb7d 2020-12-15 stsp 	va_list ap;
250 73e7eb7d 2020-12-15 stsp 	size_t i;
251 73e7eb7d 2020-12-15 stsp 
252 73e7eb7d 2020-12-15 stsp 	va_start(ap, fmt);
253 73e7eb7d 2020-12-15 stsp 	vsnprintf(buf, sizeof(buf), fmt, ap);
254 73e7eb7d 2020-12-15 stsp 	va_end(ap);
255 73e7eb7d 2020-12-15 stsp 
256 73e7eb7d 2020-12-15 stsp 	for (i = 0; i < nitems(got_errors); i++) {
257 73e7eb7d 2020-12-15 stsp 		if (code == got_errors[i].code) {
258 c884fd0a 2020-12-21 stsp 			err->code = code;
259 c884fd0a 2020-12-21 stsp 			snprintf(cerr->msg, sizeof(cerr->msg), "%s: %s", buf,
260 73e7eb7d 2020-12-15 stsp 			    got_errors[i].msg);
261 c884fd0a 2020-12-21 stsp 			err->msg = cerr->msg;
262 c884fd0a 2020-12-21 stsp 			return err;
263 73e7eb7d 2020-12-15 stsp 		}
264 73e7eb7d 2020-12-15 stsp 	}
265 73e7eb7d 2020-12-15 stsp 
266 73e7eb7d 2020-12-15 stsp 	abort();
267 73e7eb7d 2020-12-15 stsp }
268 3dc1dc04 2021-09-27 thomas 
269 3dc1dc04 2021-09-27 thomas int
270 3dc1dc04 2021-09-27 thomas got_err_open_nofollow_on_symlink(void)
271 3dc1dc04 2021-09-27 thomas {
272 3dc1dc04 2021-09-27 thomas 	/*
273 3dc1dc04 2021-09-27 thomas 	 * Check whether open(2) with O_NOFOLLOW failed on a symlink.
274 3dc1dc04 2021-09-27 thomas 	 * Posix mandates ELOOP and OpenBSD follows it. Others return
275 3dc1dc04 2021-09-27 thomas 	 * different error codes. We carry this workaround to help the
276 3dc1dc04 2021-09-27 thomas 	 * portable version a little.
277 3dc1dc04 2021-09-27 thomas 	 */
278 3dc1dc04 2021-09-27 thomas 	return (errno == ELOOP
279 3dc1dc04 2021-09-27 thomas #ifdef EMLINK
280 3dc1dc04 2021-09-27 thomas 	|| errno == EMLINK
281 3dc1dc04 2021-09-27 thomas #endif
282 3dc1dc04 2021-09-27 thomas #ifdef EFTYPE
283 3dc1dc04 2021-09-27 thomas 	|| errno == EFTYPE
284 3dc1dc04 2021-09-27 thomas #endif
285 3dc1dc04 2021-09-27 thomas 	);
286 3dc1dc04 2021-09-27 thomas }