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 const struct got_error *
42 got_error(int code)
43 {
44 	size_t i;
45 
46 	for (i = 0; i < nitems(got_errors); i++) {
47 		if (code == got_errors[i].code)
48 			return &got_errors[i];
49 	}
50 
51 	abort();
52 }
53 
54 const struct got_error *
55 got_error_msg(int code, const char *msg)
56 {
57 	static struct got_error err;
58 	size_t i;
59 
60 	for (i = 0; i < nitems(got_errors); i++) {
61 		if (code == got_errors[i].code) {
62 			err.code = code;
63 			err.msg = msg;
64 			return &err;
65 		}
66 	}
67 
68 	abort();
69 }
70 
71 const struct got_error *
72 got_error_from_errno(const char *prefix)
73 {
74 	static struct got_error err;
75 	static char err_msg[PATH_MAX + 20];
76 
77 	snprintf(err_msg, sizeof(err_msg), "%s: %s", prefix,
78 	    strerror(errno));
79 
80 	err.code = GOT_ERR_ERRNO;
81 	err.msg = err_msg;
82 	return &err;
83 }
84 
85 const struct got_error *
86 got_error_from_errno2(const char *prefix, const char *prefix2)
87 {
88 	static struct got_error err;
89 	static char err_msg[(PATH_MAX * 2) + 20];
90 
91 	snprintf(err_msg, sizeof(err_msg), "%s: %s: %s", prefix, prefix2,
92 	    strerror(errno));
93 
94 	err.code = GOT_ERR_ERRNO;
95 	err.msg = err_msg;
96 	return &err;
97 }
98 
99 const struct got_error *
100 got_error_from_errno3(const char *prefix, const char *prefix2,
101     const char *prefix3)
102 {
103 	static struct got_error err;
104 	static char err_msg[(PATH_MAX * 3) + 20];
105 
106 	snprintf(err_msg, sizeof(err_msg), "%s: %s: %s: %s", prefix, prefix2,
107 	    prefix3, strerror(errno));
108 
109 	err.code = GOT_ERR_ERRNO;
110 	err.msg = err_msg;
111 	return &err;
112 }
113 
114 const struct got_error *
115 got_error_from_errno_fmt(const char *fmt, ...)
116 {
117 	static struct got_error err;
118 	static char err_msg[PATH_MAX * 4 + 64];
119 	char buf[PATH_MAX * 4];
120 	va_list ap;
121 
122 	va_start(ap, fmt);
123 	vsnprintf(buf, sizeof(buf), fmt, ap);
124 	va_end(ap);
125 
126 	snprintf(err_msg, sizeof(err_msg), "%s: %s", buf, strerror(errno));
127 
128 	err.code = GOT_ERR_ERRNO;
129 	err.msg = err_msg;
130 	return &err;
131 }
132 
133 const struct got_error *
134 got_error_set_errno(int code, const char *prefix)
135 {
136 	errno = code;
137 	return got_error_from_errno(prefix);
138 }
139 
140 const struct got_error *
141 got_ferror(FILE *f, int code)
142 {
143 	if (ferror(f))
144 		return got_error_from_errno("");
145 	return got_error(code);
146 }
147 
148 const struct got_error *
149 got_error_no_obj(struct got_object_id *id)
150 {
151 	static char msg[sizeof("object   not found") +
152 	    SHA1_DIGEST_STRING_LENGTH];
153 	char id_str[SHA1_DIGEST_STRING_LENGTH];
154 	int ret;
155 
156 	if (!got_sha1_digest_to_str(id->sha1, id_str, sizeof(id_str)))
157 		return got_error(GOT_ERR_NO_OBJ);
158 
159 	ret = snprintf(msg, sizeof(msg), "object %s not found", id_str);
160 	if (ret == -1 || ret >= sizeof(msg))
161 		return got_error(GOT_ERR_NO_OBJ);
162 
163 	return got_error_msg(GOT_ERR_NO_OBJ, msg);
164 }
165 
166 const struct got_error *
167 got_error_not_ref(const char *refname)
168 {
169 	static char msg[sizeof("reference   not found") + 1004];
170 	int ret;
171 
172 	ret = snprintf(msg, sizeof(msg), "reference %s not found", refname);
173 	if (ret == -1 || ret >= sizeof(msg))
174 		return got_error(GOT_ERR_NOT_REF);
175 
176 	return got_error_msg(GOT_ERR_NOT_REF, msg);
177 }
178 
179 const struct got_error *
180 got_error_uuid(uint32_t uuid_status, const char *prefix)
181 {
182 	switch (uuid_status) {
183 	case uuid_s_ok:
184 		return NULL;
185 	case uuid_s_bad_version:
186 		return got_error(GOT_ERR_UUID_VERSION);
187 	case uuid_s_invalid_string_uuid:
188 		return got_error(GOT_ERR_UUID_INVALID);
189 	case uuid_s_no_memory:
190 		return got_error_set_errno(ENOMEM, prefix);
191 	default:
192 		return got_error(GOT_ERR_UUID);
193 	}
194 }
195 
196 const struct got_error *
197 got_error_path(const char *path, int code)
198 {
199 	static struct got_error err;
200 	static char msg[PATH_MAX + 128];
201 	size_t i;
202 
203 	for (i = 0; i < nitems(got_errors); i++) {
204 		if (code == got_errors[i].code) {
205 			err.code = code;
206 			snprintf(msg, sizeof(msg), "%s: %s", path,
207 			    got_errors[i].msg);
208 			err.msg = msg;
209 			return &err;
210 		}
211 	}
212 
213 	abort();
214 }
215 
216 const struct got_error *
217 got_error_fmt(int code, const char *fmt, ...)
218 {
219 	static struct got_error err;
220 	static char msg[PATH_MAX * 4 + 128];
221 	char buf[PATH_MAX * 4];
222 	va_list ap;
223 	size_t i;
224 
225 	va_start(ap, fmt);
226 	vsnprintf(buf, sizeof(buf), fmt, ap);
227 	va_end(ap);
228 
229 	for (i = 0; i < nitems(got_errors); i++) {
230 		if (code == got_errors[i].code) {
231 			err.code = code;
232 			snprintf(msg, sizeof(msg), "%s: %s", buf,
233 			    got_errors[i].msg);
234 			err.msg = msg;
235 			return &err;
236 		}
237 	}
238 
239 	abort();
240 }