diff options
Diffstat (limited to 'lib/defaults.c')
| -rw-r--r-- | lib/defaults.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/lib/defaults.c b/lib/defaults.c new file mode 100644 index 0000000..04b5fd3 --- /dev/null +++ b/lib/defaults.c @@ -0,0 +1,219 @@ +// SPDX-License-Identifier: ISC +/* + * FRR switchable defaults. + * Copyright (c) 2017-2019 David Lamparter, for NetDEF, Inc. + */ + +#include <zebra.h> + +#include "defaults.h" +#include "lib/version.h" + +static char df_version[128] = FRR_VER_SHORT, df_profile[128] = DFLT_NAME; +static struct frr_default *dflt_first = NULL, **dflt_next = &dflt_first; + +/* these are global for all FRR daemons. they have to be, since we write an + * integrated config with the same value for all daemons. + */ +const char *frr_defaults_profiles[] = { + "traditional", + "datacenter", + NULL, +}; + +static int version_value(int ch) +{ + /* non-ASCII shouldn't happen */ + if (ch < 0 || ch >= 128) + return 2; + + /* ~foo sorts older than nothing */ + if (ch == '~') + return 0; + if (ch == '\0') + return 1; + if (isalpha(ch)) + return 0x100 + tolower(ch); + + /* punctuation and digits (and everything else) */ + return 0x200 + ch; +} + +int frr_version_cmp(const char *aa, const char *bb) +{ + const char *apos = aa, *bpos = bb; + + /* || is correct, we won't scan past the end of a string since that + * doesn't compare equal to anything else */ + while (apos[0] || bpos[0]) { + if (isdigit((unsigned char)apos[0]) && + isdigit((unsigned char)bpos[0])) { + unsigned long av, bv; + char *aend = NULL, *bend = NULL; + + av = strtoul(apos, &aend, 10); + bv = strtoul(bpos, &bend, 10); + if (av < bv) + return -1; + if (av > bv) + return 1; + + apos = aend; + bpos = bend; + continue; + } + + int a = version_value(*apos++); + int b = version_value(*bpos++); + + if (a < b) + return -1; + if (a > b) + return 1; + } + return 0; +} + +static void frr_default_apply_one(struct frr_default *dflt, bool check); + +void frr_default_add(struct frr_default *dflt) +{ + dflt->next = NULL; + *dflt_next = dflt; + dflt_next = &dflt->next; + + frr_default_apply_one(dflt, true); +} + +static bool frr_match_version(const char *name, const char *vspec, + const char *version, bool check) +{ + int cmp; + static const struct spec { + const char *str; + int dir, eq; + } specs[] = { + {"<=", -1, 1}, + {">=", 1, 1}, + {"==", 0, 1}, + {"<", -1, 0}, + {">", 1, 0}, + {"=", 0, 1}, + {NULL, 0, 0}, + }; + const struct spec *s; + + if (!vspec) + /* NULL = all versions */ + return true; + + for (s = specs; s->str; s++) + if (!strncmp(s->str, vspec, strlen(s->str))) + break; + if (!s->str) { + if (check) + fprintf(stderr, "invalid version specifier for %s: %s", + name, vspec); + /* invalid version spec, never matches */ + return false; + } + + vspec += strlen(s->str); + while (isspace((unsigned char)*vspec)) + vspec++; + + cmp = frr_version_cmp(version, vspec); + if (cmp == s->dir || (s->eq && cmp == 0)) + return true; + + return false; +} + +static void frr_default_apply_one(struct frr_default *dflt, bool check) +{ + struct frr_default_entry *entry = dflt->entries; + struct frr_default_entry *dfltentry = NULL, *saveentry = NULL; + + for (; entry->match_version || entry->match_profile; entry++) { + if (entry->match_profile + && strcmp(entry->match_profile, df_profile)) + continue; + + if (!dfltentry && frr_match_version(dflt->name, + entry->match_version, df_version, check)) + dfltentry = entry; + if (!saveentry && frr_match_version(dflt->name, + entry->match_version, FRR_VER_SHORT, check)) + saveentry = entry; + + if (dfltentry && saveentry && !check) + break; + } + /* found default or arrived at last entry that has NULL,NULL spec */ + + if (!dfltentry) + dfltentry = entry; + if (!saveentry) + saveentry = entry; + + if (dflt->dflt_bool) + *dflt->dflt_bool = dfltentry->val_bool; + if (dflt->dflt_str) + *dflt->dflt_str = dfltentry->val_str; + if (dflt->dflt_long) + *dflt->dflt_long = dfltentry->val_long; + if (dflt->dflt_ulong) + *dflt->dflt_ulong = dfltentry->val_ulong; + if (dflt->dflt_float) + *dflt->dflt_float = dfltentry->val_float; + if (dflt->save_bool) + *dflt->save_bool = saveentry->val_bool; + if (dflt->save_str) + *dflt->save_str = saveentry->val_str; + if (dflt->save_long) + *dflt->save_long = saveentry->val_long; + if (dflt->save_ulong) + *dflt->save_ulong = saveentry->val_ulong; + if (dflt->save_float) + *dflt->save_float = saveentry->val_float; +} + +void frr_defaults_apply(void) +{ + struct frr_default *dflt; + + for (dflt = dflt_first; dflt; dflt = dflt->next) + frr_default_apply_one(dflt, false); +} + +bool frr_defaults_profile_valid(const char *profile) +{ + const char **p; + + for (p = frr_defaults_profiles; *p; p++) + if (!strcmp(profile, *p)) + return true; + return false; +} + +const char *frr_defaults_version(void) +{ + return df_version; +} + +const char *frr_defaults_profile(void) +{ + return df_profile; +} + +void frr_defaults_version_set(const char *version) +{ + strlcpy(df_version, version, sizeof(df_version)); + frr_defaults_apply(); +} + +void frr_defaults_profile_set(const char *profile) +{ + strlcpy(df_profile, profile, sizeof(df_profile)); + frr_defaults_apply(); +} |