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 <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <sha1.h>
25 #include <zlib.h>
26 #include <uuid.h>
27 
28 #include "got_error.h"
29 #include "got_object.h"
30 
31 #include "got_lib_delta.h"
32 #include "got_lib_inflate.h"
33 #include "got_lib_object.h"
34 #include "got_lib_sha1.h"
35 
36 #ifndef nitems
37 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
38 #endif
39 
40 const struct got_error *
41 got_error(int code)
42 {
43 	int i;
44 
45 	for (i = 0; i < nitems(got_errors); i++) {
46 		if (code == got_errors[i].code)
47 			return &got_errors[i];
48 	}
49 
50 	abort();
51 }
52 
53 const struct got_error *
54 got_error_msg(int code, const char *msg)
55 {
56 	static struct got_error err;
57 	int i;
58 
59 	for (i = 0; i < nitems(got_errors); i++) {
60 		if (code == got_errors[i].code) {
61 			err.code = code;
62 			err.msg = msg;
63 			return &err;
64 		}
65 	}
66 
67 	abort();
68 }
69 
70 const struct got_error *
71 got_error_from_errno(const char *prefix)
72 {
73 	static struct got_error err;
74 	static char err_msg[PATH_MAX + 20];
75 
76 	snprintf(err_msg, sizeof(err_msg), "%s: %s", prefix,
77 	    strerror(errno));
78 
79 	err.code = GOT_ERR_ERRNO;
80 	err.msg = err_msg;
81 	return &err;
82 }
83 
84 const struct got_error *
85 got_error_from_errno2(const char *prefix, const char *prefix2)
86 {
87 	static struct got_error err;
88 	static char err_msg[(PATH_MAX * 2) + 20];
89 
90 	snprintf(err_msg, sizeof(err_msg), "%s: %s: %s", prefix, prefix2,
91 	    strerror(errno));
92 
93 	err.code = GOT_ERR_ERRNO;
94 	err.msg = err_msg;
95 	return &err;
96 }
97 
98 const struct got_error *
99 got_error_from_errno3(const char *prefix, const char *prefix2,
100     const char *prefix3)
101 {
102 	static struct got_error err;
103 	static char err_msg[(PATH_MAX * 3) + 20];
104 
105 	snprintf(err_msg, sizeof(err_msg), "%s: %s: %s: %s", prefix, prefix2,
106 	    prefix3, strerror(errno));
107 
108 	err.code = GOT_ERR_ERRNO;
109 	err.msg = err_msg;
110 	return &err;
111 }
112 
113 const struct got_error *
114 got_error_set_errno(int code, const char *prefix)
115 {
116 	errno = code;
117 	return got_error_from_errno(prefix);
118 }
119 
120 const struct got_error *
121 got_ferror(FILE *f, int code)
122 {
123 	if (ferror(f))
124 		return got_error_from_errno("");
125 	return got_error(code);
126 }
127 
128 const struct got_error *
129 got_error_no_obj(struct got_object_id *id)
130 {
131 	static char msg[sizeof("object   not found") +
132 	    SHA1_DIGEST_STRING_LENGTH];
133 	char id_str[SHA1_DIGEST_STRING_LENGTH];
134 	int ret;
135 
136 	if (!got_sha1_digest_to_str(id->sha1, id_str, sizeof(id_str)))
137 		return got_error(GOT_ERR_NO_OBJ);
138 
139 	ret = snprintf(msg, sizeof(msg), "object %s not found", id_str);
140 	if (ret == -1 || ret >= sizeof(msg))
141 		return got_error(GOT_ERR_NO_OBJ);
142 
143 	return got_error_msg(GOT_ERR_NO_OBJ, msg);
144 }
145 
146 const struct got_error *
147 got_error_not_ref(const char *refname)
148 {
149 	static char msg[sizeof("reference   not found") + 1004];
150 	int ret;
151 
152 	ret = snprintf(msg, sizeof(msg), "reference %s not found", refname);
153 	if (ret == -1 || ret >= sizeof(msg))
154 		return got_error(GOT_ERR_NOT_REF);
155 
156 	return got_error_msg(GOT_ERR_NOT_REF, msg);
157 }
158 
159 const struct got_error *
160 got_error_uuid(uint32_t uuid_status, const char *prefix)
161 {
162 	switch (uuid_status) {
163 	case uuid_s_ok:
164 		return NULL;
165 	case uuid_s_bad_version:
166 		return got_error(GOT_ERR_UUID_VERSION);
167 	case uuid_s_invalid_string_uuid:
168 		return got_error(GOT_ERR_UUID_INVALID);
169 	case uuid_s_no_memory:
170 		return got_error_set_errno(ENOMEM, prefix);
171 	default:
172 		return got_error(GOT_ERR_UUID);
173 	}
174 }
175 
176 const struct got_error *
177 got_error_path(const char *path, int code)
178 {
179 	static struct got_error err;
180 	static char msg[PATH_MAX + 128];
181 	int i;
182 
183 	for (i = 0; i < nitems(got_errors); i++) {
184 		if (code == got_errors[i].code) {
185 			err.code = code;
186 			snprintf(msg, sizeof(msg), "%s: %s", path,
187 			    got_errors[i].msg);
188 			err.msg = msg;
189 			return &err;
190 		}
191 	}
192 
193 	abort();
194 }