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ifquery: add --property (ref #4)

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Ariadne Conill 2020-07-26 02:28:29 -06:00
parent f06ee76d41
commit 052156ac09
2 changed files with 81 additions and 2 deletions
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78
cmd/ifquery.c
View file

@ -85,6 +85,73 @@ print_interface_dot(struct lif_dict *collection, struct lif_interface *iface, st
}
}
static inline size_t
count_set_bits(const char *netmask)
{
/* netmask set to CIDR length */
if (strchr(netmask, '.') == NULL)
return strtol(netmask, NULL, 10);
size_t r = 0;
struct in_addr in;
if (inet_pton(AF_INET, netmask, &in) == 0)
return r;
/* take the IP, put it in host endian order, and
* flip it so that all the set bits are set to the right.
* then we can simply count down from 32 and right-shift
* until the bit field is all zero.
*/
unsigned int bits = htonl(in.s_addr);
for (bits = ~bits, r = 32; bits; bits >>= 1, r--)
;
return r;
}
void
print_interface_property(struct lif_interface *iface, const char *property)
{
struct lif_node *iter;
bool printing_address = !strcmp(property, "address");
LIF_DICT_FOREACH(iter, &iface->vars)
{
struct lif_dict_entry *entry = iter->data;
if (strcmp(entry->key, property))
continue;
if (printing_address)
{
struct lif_address *addr = entry->data;
size_t orig_netmask = addr->netmask;
if (!addr->netmask)
{
/* if fallback netmask is not set, default to 255.255.255.0 */
addr->netmask = 24;
struct lif_dict_entry *entry = lif_dict_find(&iface->vars, "netmask");
if (entry != NULL)
addr->netmask = count_set_bits(entry->data);
}
char addr_buf[512];
if (!lif_address_unparse(addr, addr_buf, sizeof addr_buf, true))
continue;
addr->netmask = orig_netmask;
printf("%s\n", addr_buf);
}
else
printf("%s\n", (const char *) entry->data);
}
}
void
ifquery_usage(void)
{
@ -103,6 +170,7 @@ ifquery_usage(void)
fprintf(stderr, " -S, --state-file FILE use FILE for state\n");
fprintf(stderr, " -s, --state show configured state\n");
fprintf(stderr, " -D, --dot generate a dependency graph\n");
fprintf(stderr, " -p, --property PROPERTY print values of properties matching PROPERTY\n");
exit(1);
}
@ -113,6 +181,7 @@ struct match_options {
char *include_pattern;
bool pretty_print;
bool dot;
char *property;
};
void
@ -193,6 +262,7 @@ ifquery_main(int argc, char *argv[])
{"state-file", required_argument, 0, 'S'},
{"state", no_argument, 0, 's'},
{"dot", no_argument, 0, 'D'},
{"property", required_argument, 0, 'p'},
{NULL, 0, 0, 0}
};
struct match_options match_opts = {};
@ -202,7 +272,7 @@ ifquery_main(int argc, char *argv[])
for (;;)
{
int c = getopt_long(argc, argv, "hVi:LaI:X:PS:sD", long_options, NULL);
int c = getopt_long(argc, argv, "hVi:LaI:X:PS:sDp:", long_options, NULL);
if (c == -1)
break;
@ -240,6 +310,9 @@ ifquery_main(int argc, char *argv[])
case 'D':
match_opts.dot = true;
break;
case 'p':
match_opts.property = optarg;
break;
}
}
@ -292,6 +365,9 @@ ifquery_main(int argc, char *argv[])
return EXIT_FAILURE;
}
if (match_opts.property != NULL)
print_interface_property(iface, match_opts.property);
else
print_interface(iface);
}

3
doc/ifquery.scd
View file

@ -29,6 +29,9 @@ configuration file to the current format.
*-i, --interfaces* _FILE_
Use _FILE_ as the config database.
*-p, --property* _PROPERTY_
Print the values of matching properties for an interface.
*-s, --state*
Query the state database instead of the config database.