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