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acddc0ed | 1 | // SPDX-License-Identifier: ISC |
96673e06 DL |
2 | /* |
3 | * FRR switchable defaults. | |
4 | * Copyright (c) 2017-2019 David Lamparter, for NetDEF, Inc. | |
96673e06 DL |
5 | */ |
6 | ||
7 | #include <zebra.h> | |
8 | ||
9 | #include "defaults.h" | |
09781197 | 10 | #include "lib/version.h" |
96673e06 | 11 | |
ac4adef4 DL |
12 | static char df_version[128] = FRR_VER_SHORT, df_profile[128] = DFLT_NAME; |
13 | static struct frr_default *dflt_first = NULL, **dflt_next = &dflt_first; | |
14 | ||
15 | /* these are global for all FRR daemons. they have to be, since we write an | |
16 | * integrated config with the same value for all daemons. | |
17 | */ | |
18 | const char *frr_defaults_profiles[] = { | |
19 | "traditional", | |
20 | "datacenter", | |
21 | NULL, | |
22 | }; | |
23 | ||
96673e06 DL |
24 | static int version_value(int ch) |
25 | { | |
26 | /* non-ASCII shouldn't happen */ | |
27 | if (ch < 0 || ch >= 128) | |
28 | return 2; | |
29 | ||
30 | /* ~foo sorts older than nothing */ | |
31 | if (ch == '~') | |
32 | return 0; | |
33 | if (ch == '\0') | |
34 | return 1; | |
35 | if (isalpha(ch)) | |
36 | return 0x100 + tolower(ch); | |
37 | ||
38 | /* punctuation and digits (and everything else) */ | |
39 | return 0x200 + ch; | |
40 | } | |
41 | ||
42 | int frr_version_cmp(const char *aa, const char *bb) | |
43 | { | |
44 | const char *apos = aa, *bpos = bb; | |
45 | ||
46 | /* || is correct, we won't scan past the end of a string since that | |
47 | * doesn't compare equal to anything else */ | |
48 | while (apos[0] || bpos[0]) { | |
49 | if (isdigit((unsigned char)apos[0]) && | |
50 | isdigit((unsigned char)bpos[0])) { | |
51 | unsigned long av, bv; | |
52 | char *aend = NULL, *bend = NULL; | |
53 | ||
54 | av = strtoul(apos, &aend, 10); | |
55 | bv = strtoul(bpos, &bend, 10); | |
56 | if (av < bv) | |
57 | return -1; | |
58 | if (av > bv) | |
59 | return 1; | |
60 | ||
61 | apos = aend; | |
62 | bpos = bend; | |
63 | continue; | |
64 | } | |
65 | ||
66 | int a = version_value(*apos++); | |
67 | int b = version_value(*bpos++); | |
68 | ||
69 | if (a < b) | |
70 | return -1; | |
71 | if (a > b) | |
72 | return 1; | |
73 | } | |
74 | return 0; | |
75 | } | |
ac4adef4 DL |
76 | |
77 | static void frr_default_apply_one(struct frr_default *dflt, bool check); | |
78 | ||
79 | void frr_default_add(struct frr_default *dflt) | |
80 | { | |
81 | dflt->next = NULL; | |
82 | *dflt_next = dflt; | |
83 | dflt_next = &dflt->next; | |
84 | ||
85 | frr_default_apply_one(dflt, true); | |
86 | } | |
87 | ||
88 | static bool frr_match_version(const char *name, const char *vspec, | |
89 | const char *version, bool check) | |
90 | { | |
91 | int cmp; | |
d29c01db | 92 | static const struct spec { |
ac4adef4 | 93 | const char *str; |
7b8c2b3d | 94 | int dir, eq; |
d29c01db | 95 | } specs[] = { |
ac4adef4 DL |
96 | {"<=", -1, 1}, |
97 | {">=", 1, 1}, | |
98 | {"==", 0, 1}, | |
99 | {"<", -1, 0}, | |
100 | {">", 1, 0}, | |
101 | {"=", 0, 1}, | |
102 | {NULL, 0, 0}, | |
103 | }; | |
d29c01db | 104 | const struct spec *s; |
ac4adef4 DL |
105 | |
106 | if (!vspec) | |
107 | /* NULL = all versions */ | |
108 | return true; | |
109 | ||
110 | for (s = specs; s->str; s++) | |
111 | if (!strncmp(s->str, vspec, strlen(s->str))) | |
112 | break; | |
113 | if (!s->str) { | |
114 | if (check) | |
115 | fprintf(stderr, "invalid version specifier for %s: %s", | |
116 | name, vspec); | |
117 | /* invalid version spec, never matches */ | |
118 | return false; | |
119 | } | |
120 | ||
121 | vspec += strlen(s->str); | |
122 | while (isspace((unsigned char)*vspec)) | |
123 | vspec++; | |
124 | ||
125 | cmp = frr_version_cmp(version, vspec); | |
126 | if (cmp == s->dir || (s->eq && cmp == 0)) | |
127 | return true; | |
128 | ||
129 | return false; | |
130 | } | |
131 | ||
132 | static void frr_default_apply_one(struct frr_default *dflt, bool check) | |
133 | { | |
134 | struct frr_default_entry *entry = dflt->entries; | |
135 | struct frr_default_entry *dfltentry = NULL, *saveentry = NULL; | |
136 | ||
137 | for (; entry->match_version || entry->match_profile; entry++) { | |
138 | if (entry->match_profile | |
139 | && strcmp(entry->match_profile, df_profile)) | |
140 | continue; | |
141 | ||
142 | if (!dfltentry && frr_match_version(dflt->name, | |
143 | entry->match_version, df_version, check)) | |
144 | dfltentry = entry; | |
145 | if (!saveentry && frr_match_version(dflt->name, | |
146 | entry->match_version, FRR_VER_SHORT, check)) | |
147 | saveentry = entry; | |
148 | ||
149 | if (dfltentry && saveentry && !check) | |
150 | break; | |
151 | } | |
152 | /* found default or arrived at last entry that has NULL,NULL spec */ | |
153 | ||
154 | if (!dfltentry) | |
155 | dfltentry = entry; | |
156 | if (!saveentry) | |
157 | saveentry = entry; | |
158 | ||
f210b3e3 DL |
159 | if (dflt->dflt_bool) |
160 | *dflt->dflt_bool = dfltentry->val_bool; | |
ac4adef4 DL |
161 | if (dflt->dflt_str) |
162 | *dflt->dflt_str = dfltentry->val_str; | |
163 | if (dflt->dflt_long) | |
164 | *dflt->dflt_long = dfltentry->val_long; | |
165 | if (dflt->dflt_ulong) | |
166 | *dflt->dflt_ulong = dfltentry->val_ulong; | |
167 | if (dflt->dflt_float) | |
168 | *dflt->dflt_float = dfltentry->val_float; | |
f210b3e3 DL |
169 | if (dflt->save_bool) |
170 | *dflt->save_bool = saveentry->val_bool; | |
ac4adef4 DL |
171 | if (dflt->save_str) |
172 | *dflt->save_str = saveentry->val_str; | |
173 | if (dflt->save_long) | |
174 | *dflt->save_long = saveentry->val_long; | |
175 | if (dflt->save_ulong) | |
176 | *dflt->save_ulong = saveentry->val_ulong; | |
177 | if (dflt->save_float) | |
178 | *dflt->save_float = saveentry->val_float; | |
179 | } | |
180 | ||
181 | void frr_defaults_apply(void) | |
182 | { | |
183 | struct frr_default *dflt; | |
184 | ||
185 | for (dflt = dflt_first; dflt; dflt = dflt->next) | |
186 | frr_default_apply_one(dflt, false); | |
187 | } | |
188 | ||
189 | bool frr_defaults_profile_valid(const char *profile) | |
190 | { | |
191 | const char **p; | |
192 | ||
193 | for (p = frr_defaults_profiles; *p; p++) | |
194 | if (!strcmp(profile, *p)) | |
195 | return true; | |
196 | return false; | |
197 | } | |
198 | ||
199 | const char *frr_defaults_version(void) | |
200 | { | |
201 | return df_version; | |
202 | } | |
203 | ||
204 | const char *frr_defaults_profile(void) | |
205 | { | |
206 | return df_profile; | |
207 | } | |
208 | ||
209 | void frr_defaults_version_set(const char *version) | |
210 | { | |
211 | strlcpy(df_version, version, sizeof(df_version)); | |
212 | frr_defaults_apply(); | |
213 | } | |
214 | ||
215 | void frr_defaults_profile_set(const char *profile) | |
216 | { | |
217 | strlcpy(df_profile, profile, sizeof(df_profile)); | |
218 | frr_defaults_apply(); | |
219 | } |