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// 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();
}
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