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hosts_db.c
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hosts_db.c
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/* darkstat 3
* copyright (c) 2001-2014 Emil Mikulic.
*
* hosts_db.c: database of hosts, ports, protocols.
*
* You may use, modify and redistribute this file under the terms of the
* GNU General Public License version 2. (see COPYING.GPL)
*/
#include "cdefs.h"
#include "conv.h"
#include "decode.h"
#include "dns.h"
#include "err.h"
#include "hosts_db.h"
#include "db.h"
#include "html.h"
#include "ncache.h"
#include "now.h"
#include "opt.h"
#include "str.h"
#include <netdb.h> /* struct addrinfo */
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h> /* memset(), strcmp() */
#include <time.h>
#include <unistd.h>
int hosts_db_show_macs = 0;
/* FIXME: specify somewhere more sane/tunable */
#define MAX_ENTRIES 30 /* in an HTML table rendered from a hashtable */
typedef uint32_t (hash_func_t)(const struct hashtable *, const void *);
typedef void (free_func_t)(struct bucket *);
typedef const void * (key_func_t)(const struct bucket *);
typedef int (find_func_t)(const struct bucket *, const void *);
typedef struct bucket * (make_func_t)(const void *);
typedef void (format_cols_func_t)(struct str *);
typedef void (format_row_func_t)(struct str *, const struct bucket *);
struct hashtable {
uint8_t bits; /* size of hashtable in bits */
uint32_t size, mask;
uint32_t count, count_max, count_keep; /* items in table */
uint32_t coeff; /* coefficient for Fibonacci hashing */
struct bucket **table;
struct {
uint64_t inserts, searches, deletions, rehashes;
} stats;
hash_func_t *hash_func;
/* returns hash value of given key (passed as void*) */
free_func_t *free_func;
/* free of bucket payload */
key_func_t *key_func;
/* returns pointer to key of bucket (to pass to hash_func) */
find_func_t *find_func;
/* returns true if given bucket matches key (passed as void*) */
make_func_t *make_func;
/* returns bucket containing new record with key (passed as void*) */
format_cols_func_t *format_cols_func;
/* append table columns to str */
format_row_func_t *format_row_func;
/* format record and append to str */
};
static void hashtable_reduce(struct hashtable *ht);
static void hashtable_free(struct hashtable *h);
#define HOST_BITS 1 /* initial size of hosts table */
#define PORT_BITS 1 /* initial size of ports tables */
#define PROTO_BITS 1 /* initial size of proto table */
/* We only use one hosts_db hashtable and this is it. */
static struct hashtable *hosts_db = NULL;
/* phi^-1 (reciprocal of golden ratio) = (sqrt(5) - 1) / 2 */
static const double phi_1 =
0.61803398874989490252573887119069695472717285156250;
/* Co-prime of u, using phi^-1 */
static uint32_t coprime(const uint32_t u) {
return ( (uint32_t)( (double)(u) * phi_1 ) | 1U );
}
/*
* This is the "recommended" IPv4 hash function, as seen in FreeBSD's
* src/sys/netinet/tcp_hostcache.c 1.1
*/
static uint32_t ipv4_hash(const struct addr *const a) {
uint32_t ip = a->ip.v4;
return ( (ip) ^ ((ip) >> 7) ^ ((ip) >> 17) );
}
#ifndef s6_addr32
# ifdef sun
/*
* http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/netinet/in.h#130
*/
# define s6_addr32 _S6_un._S6_u32
# else
/* Covers OpenBSD and FreeBSD. The macro __USE_GNU has
* taken care of GNU/Linux and GNU/kfreebsd. */
# define s6_addr32 __u6_addr.__u6_addr32
# endif
#endif
/*
* This is the IPv6 hash function used by FreeBSD in the same file as above,
* svn rev 122922.
*/
static uint32_t ipv6_hash(const struct addr *const a) {
const struct in6_addr *const ip6 = &(a->ip.v6);
return ( ip6->s6_addr32[0] ^ ip6->s6_addr32[1] ^
ip6->s6_addr32[2] ^ ip6->s6_addr32[3] );
}
/* ---------------------------------------------------------------------------
* hash_func collection
*/
static uint32_t
hash_func_host(const struct hashtable *h _unused_, const void *key)
{
const struct addr *a = key;
if (a->family == IPv4)
return (ipv4_hash(a));
else {
assert(a->family == IPv6);
return (ipv6_hash(a));
}
}
#define CASTKEY(type) (*((const type *)key))
static uint32_t
hash_func_short(const struct hashtable *h, const void *key)
{
return (CASTKEY(uint16_t) * h->coeff);
}
static uint32_t
hash_func_byte(const struct hashtable *h, const void *key)
{
return (CASTKEY(uint8_t) * h->coeff);
}
/* ---------------------------------------------------------------------------
* key_func collection
*/
static const void *
key_func_host(const struct bucket *b)
{
return &(b->u.host.addr);
}
static const void *
key_func_port_tcp(const struct bucket *b)
{
return &(b->u.port_tcp.port);
}
static const void *
key_func_port_udp(const struct bucket *b)
{
return &(b->u.port_udp.port);
}
static const void *
key_func_ip_proto(const struct bucket *b)
{
return &(b->u.ip_proto.proto);
}
/* ---------------------------------------------------------------------------
* find_func collection
*/
static int
find_func_host(const struct bucket *b, const void *key)
{
return (addr_equal(key, &(b->u.host.addr)));
}
static int
find_func_port_tcp(const struct bucket *b, const void *key)
{
return (b->u.port_tcp.port == CASTKEY(uint16_t));
}
static int
find_func_port_udp(const struct bucket *b, const void *key)
{
return (b->u.port_udp.port == CASTKEY(uint16_t));
}
static int
find_func_ip_proto(const struct bucket *b, const void *key)
{
return (b->u.ip_proto.proto == CASTKEY(uint8_t));
}
/* ---------------------------------------------------------------------------
* make_func collection
*/
#define MAKE_BUCKET(name_bucket, name_content, type) struct { \
struct bucket *next; \
uint64_t in, out, total; \
union { struct type t; } u; } _custom_bucket; \
struct bucket *name_bucket = xcalloc(1, sizeof(_custom_bucket)); \
struct type *name_content = &(name_bucket->u.type); \
name_bucket->next = NULL; \
name_bucket->in = name_bucket->out = name_bucket->total = 0;
static struct bucket *
make_func_host(const void *key)
{
MAKE_BUCKET(b, h, host);
h->addr = CASTKEY(struct addr);
h->dns = NULL;
h->last_seen_mono = 0;
memset(&h->mac_addr, 0, sizeof(h->mac_addr));
h->ports_tcp = NULL;
h->ports_tcp_remote = NULL;
h->ports_udp = NULL;
h->ports_udp_remote = NULL;
h->ip_protos = NULL;
return (b);
}
static void
free_func_host(struct bucket *b)
{
struct host *h = &(b->u.host);
if (h->dns != NULL) free(h->dns);
hashtable_free(h->ports_tcp);
hashtable_free(h->ports_tcp_remote);
hashtable_free(h->ports_udp);
hashtable_free(h->ports_udp_remote);
hashtable_free(h->ip_protos);
}
static struct bucket *
make_func_port_tcp(const void *key)
{
MAKE_BUCKET(b, p, port_tcp);
p->port = CASTKEY(uint16_t);
p->syn = 0;
return (b);
}
static struct bucket *
make_func_port_udp(const void *key)
{
MAKE_BUCKET(b, p, port_udp);
p->port = CASTKEY(uint16_t);
return (b);
}
static struct bucket *
make_func_ip_proto(const void *key)
{
MAKE_BUCKET(b, p, ip_proto);
p->proto = CASTKEY(uint8_t);
return (b);
}
static void
free_func_simple(struct bucket *b _unused_)
{
/* nop */
}
/* ---------------------------------------------------------------------------
* format_func collection (ordered by struct)
*/
static void
format_cols_host(struct str *buf)
{
/* FIXME: don't clobber parts of the query string
* specifically "full" and "start"
* when setting sort direction
*/
str_append(buf,
"<table>\n"
"<tr>\n"
" <th>IP</th>\n"
" <th>Hostname</th>\n");
if (hosts_db_show_macs) str_append(buf,
" <th>MAC Address</th>\n");
str_append(buf,
" <th><a href=\"?sort=in\">In</a></th>\n"
" <th><a href=\"?sort=out\">Out</a></th>\n"
" <th><a href=\"?sort=total\">Total</a></th>\n");
if (opt_want_lastseen) str_append(buf,
" <th><a href=\"?sort=lastseen\">Last seen</a></th>\n");
str_append(buf,
"</tr>\n");
}
static void
format_row_host(struct str *buf, const struct bucket *b)
{
const char *ip = addr_to_str(&(b->u.host.addr));
str_appendf(buf,
"<tr>\n"
" <td><a href=\"./%s/\">%s</a></td>\n"
" <td>%s</td>\n",
ip, ip,
(b->u.host.dns == NULL) ? "" : b->u.host.dns);
if (hosts_db_show_macs)
str_appendf(buf,
" <td><tt>%x:%x:%x:%x:%x:%x</tt></td>\n",
b->u.host.mac_addr[0],
b->u.host.mac_addr[1],
b->u.host.mac_addr[2],
b->u.host.mac_addr[3],
b->u.host.mac_addr[4],
b->u.host.mac_addr[5]);
str_appendf(buf,
" <td class=\"num\">%'qu</td>\n"
" <td class=\"num\">%'qu</td>\n"
" <td class=\"num\">%'qu</td>\n",
(qu)b->in,
(qu)b->out,
(qu)b->total);
if (opt_want_lastseen) {
int64_t last = b->u.host.last_seen_mono;
int64_t now = (int64_t)now_mono();
struct str *last_str = NULL;
if ((now >= last) && (last != 0))
last_str = length_of_time(now - last);
str_append(buf, " <td class=\"num\">");
if (last_str == NULL) {
if (last == 0)
str_append(buf, "(never)");
else
str_appendf(buf, "(clock error: last = %qd, now = %qu)",
(qd)last,
(qu)now);
} else {
str_appendstr(buf, last_str);
str_free(last_str);
}
str_append(buf, "</td>");
}
str_appendf(buf, "</tr>\n");
/* Only resolve hosts "on demand" */
if (b->u.host.dns == NULL)
dns_queue(&(b->u.host.addr));
}
static void
format_cols_port_tcp(struct str *buf)
{
str_append(buf,
"<table>\n"
"<tr>\n"
" <th>Port</td>\n"
" <th>Service</td>\n"
" <th>In</td>\n"
" <th>Out</td>\n"
" <th>Total</td>\n"
" <th>SYNs</td>\n"
"</tr>\n"
);
}
static void
format_row_port_tcp(struct str *buf, const struct bucket *b)
{
const struct port_tcp *p = &(b->u.port_tcp);
str_appendf(buf,
"<tr>\n"
" <td class=\"num\">%u</td>\n"
" <td>%s</td>\n"
" <td class=\"num\">%'qu</td>\n"
" <td class=\"num\">%'qu</td>\n"
" <td class=\"num\">%'qu</td>\n"
" <td class=\"num\">%'qu</td>\n"
"</tr>\n",
p->port,
getservtcp(p->port),
(qu)b->in,
(qu)b->out,
(qu)b->total,
(qu)p->syn
);
}
static void
format_cols_port_udp(struct str *buf)
{
str_append(buf,
"<table>\n"
"<tr>\n"
" <th>Port</td>\n"
" <th>Service</td>\n"
" <th>In</td>\n"
" <th>Out</td>\n"
" <th>Total</td>\n"
"</tr>\n"
);
}
static void
format_row_port_udp(struct str *buf, const struct bucket *b)
{
const struct port_udp *p = &(b->u.port_udp);
str_appendf(buf,
"<tr>\n"
" <td class=\"num\">%u</td>\n"
" <td>%s</td>\n"
" <td class=\"num\">%'qu</td>\n"
" <td class=\"num\">%'qu</td>\n"
" <td class=\"num\">%'qu</td>\n"
"</tr>\n",
p->port,
getservudp(p->port),
(qu)b->in,
(qu)b->out,
(qu)b->total
);
}
static void
format_cols_ip_proto(struct str *buf)
{
str_append(buf,
"<table>\n"
"<tr>\n"
" <th>#</td>\n"
" <th>Protocol</td>\n"
" <th>In</td>\n"
" <th>Out</td>\n"
" <th>Total</td>\n"
"</tr>\n"
);
}
static void
format_row_ip_proto(struct str *buf, const struct bucket *b)
{
const struct ip_proto *p = &(b->u.ip_proto);
str_appendf(buf,
"<tr>\n"
" <td class=\"num\">%u</td>\n"
" <td>%s</td>\n"
" <td class=\"num\">%'qu</td>\n"
" <td class=\"num\">%'qu</td>\n"
" <td class=\"num\">%'qu</td>\n"
"</tr>\n",
p->proto,
getproto(p->proto),
(qu)b->in,
(qu)b->out,
(qu)b->total
);
}
/* ---------------------------------------------------------------------------
* Initialise a hashtable.
*/
static struct hashtable *
hashtable_make(const uint8_t bits,
const unsigned int count_max,
const unsigned int count_keep,
hash_func_t *hash_func,
free_func_t *free_func,
key_func_t *key_func,
find_func_t *find_func,
make_func_t *make_func,
format_cols_func_t *format_cols_func,
format_row_func_t *format_row_func)
{
struct hashtable *hash;
assert(bits > 0);
hash = xmalloc(sizeof(*hash));
hash->bits = bits;
hash->count_max = count_max;
hash->count_keep = count_keep;
hash->size = 1U << bits;
hash->mask = hash->size - 1;
hash->coeff = coprime(hash->size);
hash->hash_func = hash_func;
hash->free_func = free_func;
hash->key_func = key_func;
hash->find_func = find_func;
hash->make_func = make_func;
hash->format_cols_func = format_cols_func;
hash->format_row_func = format_row_func;
hash->count = 0;
hash->table = xcalloc(hash->size, sizeof(*hash->table));
memset(&(hash->stats), 0, sizeof(hash->stats));
return (hash);
}
/* ---------------------------------------------------------------------------
* Initialise global hosts_db.
*/
void
hosts_db_init(void)
{
assert(hosts_db == NULL);
hosts_db = hashtable_make(HOST_BITS, opt_hosts_max, opt_hosts_keep,
hash_func_host, free_func_host, key_func_host, find_func_host,
make_func_host, format_cols_host, format_row_host);
}
static void
hashtable_rehash(struct hashtable *h, const uint8_t bits)
{
struct bucket **old_table, **new_table;
uint32_t i, old_size;
assert(h != NULL);
assert(bits > 0);
h->stats.rehashes++;
old_size = h->size;
old_table = h->table;
h->bits = bits;
h->size = 1U << bits;
h->mask = h->size - 1;
h->coeff = coprime(h->size);
new_table = xcalloc(h->size, sizeof(*new_table));
for (i=0; i<old_size; i++) {
struct bucket *next, *b = old_table[i];
while (b != NULL) {
uint32_t pos = h->hash_func(h, h->key_func(b)) & h->mask;
next = b->next;
b->next = new_table[pos];
new_table[pos] = b;
b = next;
}
}
free(h->table);
h->table = new_table;
}
static void
hashtable_insert(struct hashtable *h, struct bucket *b)
{
uint32_t pos;
assert(h != NULL);
assert(b != NULL);
assert(b->next == NULL);
/* Rehash on 80% occupancy */
if ((h->count > h->size) ||
((h->size - h->count) < h->size / 5))
hashtable_rehash(h, h->bits+1);
pos = h->hash_func(h, h->key_func(b)) & h->mask;
if (h->table[pos] == NULL)
h->table[pos] = b;
else {
/* Insert at top of chain. */
b->next = h->table[pos];
h->table[pos] = b;
}
h->count++;
h->stats.inserts++;
}
/* Return bucket matching key, or NULL if no such entry. */
static struct bucket *
hashtable_search(struct hashtable *h, const void *key)
{
uint32_t pos;
struct bucket *b;
h->stats.searches++;
pos = h->hash_func(h, key) & h->mask;
b = h->table[pos];
while (b != NULL) {
if (h->find_func(b, key))
return (b);
else
b = b->next;
}
return (NULL);
}
typedef enum { NO_REDUCE = 0, ALLOW_REDUCE = 1 } reduce_bool;
/* Search for a key. If it's not there, make and insert a bucket for it. */
static struct bucket *
hashtable_find_or_insert(struct hashtable *h, const void *key,
const reduce_bool allow_reduce)
{
struct bucket *b = hashtable_search(h, key);
if (b == NULL) {
/* Not found, so insert after checking occupancy. */
if (allow_reduce && (h->count >= h->count_max))
hashtable_reduce(h);
b = h->make_func(key);
hashtable_insert(h, b);
}
return (b);
}
/*
* Frees the hashtable and the buckets. The contents are assumed to be
* "simple" -- i.e. no "destructor" action is required beyond simply freeing
* the bucket.
*/
static void
hashtable_free(struct hashtable *h)
{
uint32_t i;
if (h == NULL)
return;
for (i=0; i<h->size; i++) {
struct bucket *tmp, *b = h->table[i];
while (b != NULL) {
tmp = b;
b = b->next;
h->free_func(tmp);
free(tmp);
}
}
free(h->table);
free(h);
}
/* ---------------------------------------------------------------------------
* Return existing host or insert a new one.
*/
struct bucket *
host_get(const struct addr *const a)
{
return (hashtable_find_or_insert(hosts_db, a, NO_REDUCE));
}
/* ---------------------------------------------------------------------------
* Find host, returns NULL if not in DB.
*/
struct bucket *
host_find(const struct addr *const a)
{
return (hashtable_search(hosts_db, a));
}
/* ---------------------------------------------------------------------------
* Find host, returns NULL if not in DB.
*/
static struct bucket *
host_search(const char *ipstr)
{
struct addr a;
struct addrinfo hints, *ai;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_flags = AI_NUMERICHOST;
if (getaddrinfo(ipstr, NULL, &hints, &ai))
return (NULL); /* invalid addr */
if (ai->ai_family == AF_INET) {
a.family = IPv4;
a.ip.v4 = ((const struct sockaddr_in *)ai->ai_addr)->sin_addr.s_addr;
}
else if (ai->ai_family == AF_INET6) {
a.family = IPv6;
memcpy(&(a.ip.v6),
((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr.s6_addr,
sizeof(a.ip.v6));
} else {
freeaddrinfo(ai);
return (NULL); /* unknown family */
}
freeaddrinfo(ai);
verbosef("search(%s) turned into %s", ipstr, addr_to_str(&a));
return (hashtable_search(hosts_db, &a));
}
/* ---------------------------------------------------------------------------
* Reduce a hashtable to the top <keep> entries.
*/
static void
hashtable_reduce(struct hashtable *ht)
{
uint32_t i, pos, rmd;
const struct bucket **table;
uint64_t cutoff;
assert(ht->count_keep < ht->count);
/* Fill table with pointers to buckets in hashtable. */
table = xcalloc(ht->count, sizeof(*table));
for (pos=0, i=0; i<ht->size; i++) {
struct bucket *b = ht->table[i];
while (b != NULL) {
table[pos++] = b;
b = b->next;
}
}
assert(pos == ht->count);
qsort_buckets(table, ht->count, 0, ht->count_keep, TOTAL);
cutoff = table[ht->count_keep]->total;
free(table);
/* Remove all elements with total <= cutoff. */
rmd = 0;
for (i=0; i<ht->size; i++) {
struct bucket *last = NULL, *next, *b = ht->table[i];
while (b != NULL) {
next = b->next;
if (b->total <= cutoff) {
/* Remove this one. */
ht->free_func(b);
free(b);
if (last == NULL)
ht->table[i] = next;
else
last->next = next;
rmd++;
ht->count--;
} else {
last = b;
}
b = next;
}
}
verbosef("hashtable_reduce: removed %u buckets, left %u",
rmd, ht->count);
hashtable_rehash(ht, ht->bits); /* is this needed? */
}
/* Reduce hosts_db if needed. */
void hosts_db_reduce(void)
{
if (hosts_db->count >= hosts_db->count_max)
hashtable_reduce(hosts_db);
}
/* ---------------------------------------------------------------------------
* Reset hosts_db to empty.
*/
void
hosts_db_reset(void)
{
unsigned int i;
for (i=0; i<hosts_db->size; i++) {
struct bucket *next, *b = hosts_db->table[i];
while (b != NULL) {
next = b->next;
hosts_db->free_func(b);
free(b);
b = next;
}
hosts_db->table[i] = NULL;
}
verbosef("hosts_db reset to empty, freed %u hosts", hosts_db->count);
hosts_db->count = 0;
}
/* ---------------------------------------------------------------------------
* Deallocate hosts_db.
*/
void hosts_db_free(void)
{
uint32_t i;
assert(hosts_db != NULL);
for (i=0; i<hosts_db->size; i++) {
struct bucket *tmp, *b = hosts_db->table[i];
while (b != NULL) {
tmp = b;
b = b->next;
hosts_db->free_func(tmp);
free(tmp);
}
}
free(hosts_db->table);
free(hosts_db);
hosts_db = NULL;
}
/* ---------------------------------------------------------------------------
* Find or create a port_tcp inside a host.
*/
struct bucket *
host_get_port_tcp(struct bucket *host, const uint16_t port)
{
struct host *h = &host->u.host;
if (h->ports_tcp == NULL)
h->ports_tcp = hashtable_make(PORT_BITS, opt_ports_max, opt_ports_keep,
hash_func_short, free_func_simple, key_func_port_tcp,
find_func_port_tcp, make_func_port_tcp,
format_cols_port_tcp, format_row_port_tcp);
return (hashtable_find_or_insert(h->ports_tcp, &port, ALLOW_REDUCE));
}
struct bucket *
host_get_port_tcp_remote(struct bucket *host, const uint16_t port)
{
struct host *h = &host->u.host;
if (h->ports_tcp_remote == NULL)
h->ports_tcp_remote = hashtable_make(
PORT_BITS, opt_ports_max, opt_ports_keep, hash_func_short,
free_func_simple, key_func_port_tcp, find_func_port_tcp,
make_func_port_tcp, format_cols_port_tcp, format_row_port_tcp);
return (hashtable_find_or_insert(h->ports_tcp_remote, &port, ALLOW_REDUCE));
}
/* ---------------------------------------------------------------------------
* Find or create a port_udp inside a host.
*/
struct bucket *
host_get_port_udp(struct bucket *host, const uint16_t port)
{
struct host *h = &host->u.host;
if (h->ports_udp == NULL)
h->ports_udp = hashtable_make(PORT_BITS, opt_ports_max, opt_ports_keep,
hash_func_short, free_func_simple, key_func_port_udp,
find_func_port_udp, make_func_port_udp,
format_cols_port_udp, format_row_port_udp);
return (hashtable_find_or_insert(h->ports_udp, &port, ALLOW_REDUCE));
}
struct bucket *
host_get_port_udp_remote(struct bucket *host, const uint16_t port)
{
struct host *h = &host->u.host;
if (h->ports_udp_remote == NULL)
h->ports_udp_remote = hashtable_make(
PORT_BITS, opt_ports_max, opt_ports_keep, hash_func_short,
free_func_simple, key_func_port_udp, find_func_port_udp,
make_func_port_udp, format_cols_port_udp, format_row_port_udp);
return (hashtable_find_or_insert(h->ports_udp_remote, &port, ALLOW_REDUCE));
}
/* ---------------------------------------------------------------------------
* Find or create an ip_proto inside a host.
*/
struct bucket *
host_get_ip_proto(struct bucket *host, const uint8_t proto)
{
struct host *h = &host->u.host;
static const unsigned int PROTOS_MAX = 512, PROTOS_KEEP = 256;
assert(h != NULL);
if (h->ip_protos == NULL)
h->ip_protos = hashtable_make(PROTO_BITS, PROTOS_MAX, PROTOS_KEEP,
hash_func_byte, free_func_simple, key_func_ip_proto,
find_func_ip_proto, make_func_ip_proto,
format_cols_ip_proto, format_row_ip_proto);
return (hashtable_find_or_insert(h->ip_protos, &proto, ALLOW_REDUCE));
}
static struct str *html_hosts_main(const char *qs);
static struct str *html_hosts_detail(const char *ip);
/* ---------------------------------------------------------------------------
* Web interface: delegate the /hosts/ space.
*/
struct str *
html_hosts(const char *uri, const char *query)
{
unsigned int i, num_elems;
char **elem = split('/', uri, &num_elems);
struct str *buf = NULL;
assert(num_elems >= 1);
assert(strcmp(elem[0], "hosts") == 0);
if (num_elems == 1)
/* /hosts/ */
buf = html_hosts_main(query);
else if (num_elems == 2)
/* /hosts/<IP of host>/ */
buf = html_hosts_detail(elem[1]);
for (i=0; i<num_elems; i++)
free(elem[i]);
free(elem);
return (buf); /* FIXME: a NULL here becomes 404 Not Found, we might want
other codes to be possible */
}
/* ---------------------------------------------------------------------------
* Get an array of pointers to all the buckets in the hashtable,
* or NULL if the hashtable is NULL or empty.
* The returned pointer should be free'd by the caller.
*/
const struct bucket **
hashtable_list_buckets(struct hashtable *ht)
{
const struct bucket **table;
unsigned int i, pos;
if ((ht == NULL) || (ht->count == 0)) {
return NULL;
}
/* Fill table with pointers to buckets in hashtable. */
table = xcalloc(ht->count, sizeof(*table));
for (pos=0, i=0; i<ht->size; i++) {
struct bucket *b = ht->table[i];
while (b != NULL) {
table[pos++] = b;
b = b->next;
}
}
assert(pos == ht->count);
return table;
}
typedef void (hashtable_foreach_func_t)(const struct bucket *, const void *);
/* ---------------------------------------------------------------------------
* Loop over all buckets in the given hashtable, calling the supplied function
* with each bucket and the supplied user_data.
*/
static void
hashtable_foreach(struct hashtable *ht,
hashtable_foreach_func_t *hashtable_foreach_func,
const void *user_data)
{
const struct bucket **table;
unsigned int i;
table = hashtable_list_buckets(ht);
if (table == NULL)
return;
for (i = 0; i<ht->count; i++) {
const struct bucket *b = table[i];
(*hashtable_foreach_func)(b, user_data);
}
free(table);
}
/* ---------------------------------------------------------------------------
* Format hashtable into HTML.
*/
static void
format_table(struct str *buf, struct hashtable *ht, unsigned int start,
const enum sort_dir sort, const int full)
{
const struct bucket **table;
unsigned int i, end;
int alt = 0;
table = hashtable_list_buckets(ht);
if (table == NULL) {
str_append(buf, "<p>The table is empty.</p>\n");
return;
}
if (full) {
/* full report overrides start and end */
start = 0;
end = ht->count;
} else
end = MIN(ht->count, (uint32_t)start+MAX_ENTRIES);
str_appendf(buf, "(%u-%u of %u)<br>\n", start+1, end, ht->count);
qsort_buckets(table, ht->count, start, end, sort);
ht->format_cols_func(buf);
for (i=start; i<end; i++) {
ht->format_row_func(buf, table[i]);
alt = !alt; /* alternate class for table rows */
}
free(table);
str_append(buf, "</table>\n");