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Merge commit '2c7555cf2ac8439713dd9148b348128c57222a38' into thread-next

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The UDP logging had to be substantially rewritten due to a different
logging backend and reconfiguration mechanisms.

Conflicts:
	doc/bird.sgml
	sysdep/unix/config.Y
	sysdep/unix/io.c
	sysdep/unix/log.c
	sysdep/unix/unix.h
This commit is contained in:
Maria Matejka 2024-01-28 23:01:39 +01:00
commit cd81b6d7cd
7 changed files with 264 additions and 65 deletions
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5
doc/bird.sgml
View File

@ -543,11 +543,12 @@ ipv6 table
include "tablename.conf";;
</code>
<tag><label id="opt-log">log "<m/filename/" [<m/limit/ "<m/backup/"] | fixed "<m/filename/" <m/size/ | syslog [name <m/name/] | stderr all|{ <m/list of classes/ }</tag>
<tag><label id="opt-log">log "<m/filename/" [<m/limit/ "<m/backup/"] | fixed "<m/filename/" <m/size/ | syslog [name <m/name/] | stderr | udp <m/address/ [port <m/port/] all|{ <m/list of classes/ }</tag>
Set logging of messages having the given class (either <cf/all/ or <cf>{
error|trace [, <m/.../] }</cf> etc.) into selected destination - a file
specified as a filename string (with optional log rotation information),
syslog (with optional name argument), or the stderr output.
syslog (with optional name argument), the stderr output, or as a UDP
message (in <rfc id="3164"> syslog format).
Classes are:
<cf/info/, <cf/warning/, <cf/error/ and <cf/fatal/ for messages about local problems,

1
lib/birdlib.h
View File

@ -165,6 +165,7 @@ typedef struct buffer {
enum log_buffer_pos {
LBP_TIMESTAMP = 0,
LBP_UDP_HEADER,
LBP_THREAD_ID,
LBP_CLASS,
LBP_MSG,

1
lib/socket.h
View File

@ -133,6 +133,7 @@ extern int sk_priority_control; /* Suggested priority for control traffic, shou
#define SKF_BIND 0x10 /* Bind datagram socket to given source address */
#define SKF_HIGH_PORT 0x20 /* Choose port from high range if possible */
#define SKF_FREEBIND 0x40 /* Allow socket to bind to a nonlocal address */
#define SKF_CONNECT 0x80 /* Connect datagram socket to given dst address/port */
#define SKF_TRUNCATED 0x200 /* Received packet was truncated, set by IO layer */
#define SKF_HDRINCL 0x400 /* Used internally */

17
sysdep/unix/config.Y
View File

@ -17,7 +17,7 @@ static struct log_config *this_log;
CF_DECLS
CF_KEYWORDS(LOG, SYSLOG, ALL, DEBUG, TRACE, INFO, REMOTE, WARNING, ERROR, AUTH, FATAL, BUG, STDERR, SOFT)
CF_KEYWORDS(LOG, SYSLOG, ALL, DEBUG, TRACE, INFO, REMOTE, WARNING, ERROR, AUTH, FATAL, BUG, STDERR, SOFT, UDP, PORT)
CF_KEYWORDS(NAME, CONFIRM, UNDO, CHECK, TIMEOUT, DEBUG, LATENCY, LIMIT, WATCHDOG, WARNING, STATUS)
CF_KEYWORDS(GRACEFUL, RESTART, FIXED)
@ -67,6 +67,21 @@ log_file:
}
| SYSLOG syslog_name { this_log->rf = NULL; new_config->syslog_name = $2; }
| STDERR { this_log->rf = &rf_stderr; this_log->terminal_flag = 1; }
| UDP log_udp_host log_udp_port { this_log->rf = NULL; }
;
log_udp_host: text_or_ipa
{
if ($1.type == T_STRING)
this_log->udp_host = $1.val.s;
else if ($1.type == T_IP)
this_log->udp_ip = $1.val.ip;
else bug("Bad text_or_ipa");
};
log_udp_port:
/* empty */ { this_log->udp_port = 514; }
| PORT NUM { check_u16($2); this_log->udp_port = $2; }
;
log_mask:

60
sysdep/unix/io.c
View File

@ -32,6 +32,7 @@
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/icmp6.h>
#include <netdb.h>
#include "nest/bird.h"
#include "lib/lists.h"
@ -139,7 +140,6 @@ struct rfile *
rf_open(pool *p, const char *name, enum rf_mode mode, off_t limit)
{
int fd = rf_open_get_fd(name, mode);
if (fd < 0)
return NULL; /* The caller takes care of printing %m. */
@ -170,6 +170,7 @@ rf_open(pool *p, const char *name, enum rf_mode mode, off_t limit)
bug("rf_open() must have the mode set");
}
return r;
}
@ -1186,6 +1187,14 @@ sk_setup(sock *s)
return 0;
}
static int
sk_connect(sock *s)
{
sockaddr sa;
sockaddr_fill(&sa, s->af, s->daddr, s->iface, s->dport);
return connect(s->fd, &sa.sa, SA_LEN(sa));
}
static void
sk_tcp_connected(sock *s)
{
@ -1627,8 +1636,7 @@ sk_open(sock *s, struct birdloop *loop)
switch (s->type)
{
case SK_TCP_ACTIVE:
sockaddr_fill(&sa, s->af, s->daddr, s->iface, s->dport);
if (connect(fd, &sa.sa, SA_LEN(sa)) >= 0)
if (sk_connect(s) >= 0)
sk_tcp_connected(s);
else if (errno != EINTR && errno != EAGAIN && errno != EINPROGRESS &&
errno != ECONNREFUSED && errno != EHOSTUNREACH && errno != ENETUNREACH)
@ -1640,6 +1648,14 @@ sk_open(sock *s, struct birdloop *loop)
ERR2("listen");
break;
case SK_UDP:
if (s->flags & SKF_CONNECT)
if (sk_connect(s) < 0)
ERR2("connect");
sk_alloc_bufs(s);
break;
case SK_SSH_ACTIVE:
case SK_MAGIC:
break;
@ -2117,10 +2133,7 @@ sk_write_noflush(sock *s)
{
case SK_TCP_ACTIVE:
{
sockaddr sa;
sockaddr_fill(&sa, s->af, s->daddr, s->iface, s->dport);
if (connect(s->fd, &sa.sa, SA_LEN(sa)) >= 0 || errno == EISCONN)
if (sk_connect(s) >= 0 || errno == EISCONN)
sk_tcp_connected(s);
else if (errno != EINTR && errno != EAGAIN && errno != EINPROGRESS)
s->err_hook(s, errno);
@ -2565,3 +2578,36 @@ test_old_bird(char *path)
die("I found another BIRD running.");
close(fd);
}
/*
* DNS resolver
*/
ip_addr
resolve_hostname(const char *host, int type, const char **err_msg)
{
struct addrinfo *res;
struct addrinfo hints = {
.ai_family = AF_UNSPEC,
.ai_socktype = (type == SK_UDP) ? SOCK_DGRAM : SOCK_STREAM,
.ai_flags = AI_ADDRCONFIG,
};
*err_msg = NULL;
int err_code = getaddrinfo(host, NULL, &hints, &res);
if (err_code != 0)
{
*err_msg = gai_strerror(err_code);
return IPA_NONE;
}
ip_addr addr = IPA_NONE;
uint unused;
sockaddr_read((sockaddr *) res->ai_addr, res->ai_family, &addr, NULL, &unused);
freeaddrinfo(res);
return addr;
}

154
sysdep/unix/log.c
View File

@ -28,6 +28,7 @@
#include "conf/conf.h"
#include "lib/string.h"
#include "lib/lists.h"
#include "lib/socket.h"
#include "sysdep/unix/unix.h"
#include "sysdep/unix/io-loop.h"
@ -91,12 +92,17 @@ struct log_channel {
_Atomic uint mask; /* Classes to log */
uint new_mask; /* Pending new mask */
uint prepare; /* Which message parts to prepare */
const char *udp_host; /* UDP log dst host name */
ip_addr udp_ip; /* UDP log dst IP address */
uint udp_port; /* UDP log dst port */
sock * _Atomic udp_sk; /* UDP socket */
};
struct log_thread_syncer {
struct bird_thread_syncer sync;
struct log_channel *lc_close;
struct rfile *rf_close;
sock *sk_close;
const char *name;
event lts_event;
};
@ -110,12 +116,16 @@ lts_done(struct bird_thread_syncer *sync)
if (lts->lc_close)
{
lts->rf_close = atomic_load_explicit(&lts->lc_close->rf, memory_order_relaxed);
lts->sk_close = atomic_load_explicit(&lts->lc_close->udp_sk, memory_order_relaxed);
mb_free(lts->lc_close);
}
if (lts->rf_close && lts->rf_close != &rf_stderr)
rfree(lts->rf_close);
if (lts->sk_close)
rfree(lts->sk_close);
mb_free(lts);
log_unlock();
}
@ -154,8 +164,6 @@ log_rotate(struct log_channel *lc)
atomic_store_explicit(&lc->rf, rf, memory_order_release);
}
#define LOG_MSG_OFFSET (TM_DATETIME_BUFFER_SIZE + 64)
/**
* log_commit - commit a log message
* @class: message class information (%L_DEBUG to %L_BUG, see |lib/birdlib.h|)
@ -192,7 +200,9 @@ log_commit(log_buffer *buf)
continue;
struct rfile *rf = atomic_load_explicit(&l->rf, memory_order_acquire);
if (rf)
sock *sk = atomic_load_explicit(&l->udp_sk, memory_order_acquire);
if (rf || sk)
{
/* Construct the iovec */
static char terminal_prefix[] = "bird: ",
@ -218,6 +228,8 @@ log_commit(log_buffer *buf)
};
}
if (rf)
{
iov[iov_count++] = (struct iovec) {
.iov_base = newline,
.iov_len = sizeof newline - 1,
@ -241,6 +253,13 @@ log_commit(log_buffer *buf)
rf = atomic_load_explicit(&l->rf, memory_order_relaxed);
} while (!rf_writev(rf, iov, iov_count));
}
else if (sk)
{
while ((writev(sk->fd, iov, iov_count) < 0) && (errno == EINTR))
;
/* FIXME: Silently ignoring write errors */
}
}
#ifdef HAVE_SYSLOG_H
else
{
@ -275,6 +294,23 @@ log_prepare(log_buffer *buf, int class)
*(buf->buf.pos++) = ' ';
}
buf->pos[LBP_UDP_HEADER] = buf->buf.pos;
if (BIT32_TEST(&lf, LBP_UDP_HEADER))
{
/* Legacy RFC 3164 format, but with us precision */
buffer_print(&buf->buf, "<%d>", LOG_DAEMON | syslog_priorities[class]);
const char *fmt = "%b %d %T.%6f";
int t = tm_format_real_time(buf->buf.pos, buf->buf.end - buf->buf.pos, fmt, current_real_time());
if (t)
buf->buf.pos += t;
else
buffer_puts(&buf->buf, "<time format error>");
const char *hostname = (config && config->hostname) ? config->hostname : "<none>";
buffer_print(&buf->buf, " %s %s: ", hostname, bird_name);
}
buf->pos[LBP_THREAD_ID] = buf->buf.pos;
if (BIT32_TEST(&lf, LBP_THREAD_ID))
buffer_print(&buf->buf, "[%04x] ", THIS_THREAD_ID);
@ -473,6 +509,7 @@ default_log_list(int initial, const char **syslog_name)
return &log_list;
}
void
log_switch(int initial, list *logs, const char *new_syslog_name)
{
@ -549,14 +586,38 @@ log_switch(int initial, list *logs, const char *new_syslog_name)
}
l->rf = NULL;
l->found_old = 1;
}
}
else if (ol->udp_port)
{
WALK_LIST(l, *logs)
if (
(l->udp_port == ol->udp_port) && (
(l->udp_host && !strcmp(l->udp_host, ol->udp_host)) ||
(ipa_nonzero(l->udp_ip) && (ipa_equal(l->udp_ip, ol->udp_ip)))
))
{
/* Merge the mask */
ol->new_mask |= l->mask;
total_mask |= l->mask;
/* Merge flags */
flags |= ol->prepare;
/* The socket just stays open */
l->found_old = 1;
}
}
else
{
WALK_LIST(l, *logs)
if (!l->filename && !l->rf)
if (!l->filename && !l->rf && !l->udp_port)
{
ol->new_mask |= l->mask;
total_mask |= l->mask;
l->found_old = 1;
}
}
/* First only extend masks */
@ -568,7 +629,10 @@ log_switch(int initial, list *logs, const char *new_syslog_name)
/* Open new log channels */
WALK_LIST(l, *logs)
{
if (!l->rf)
if (l->found_old)
continue;
if (!l->rf && !l->udp_port)
continue;
/* Truly new log channel */
@ -576,6 +640,8 @@ log_switch(int initial, list *logs, const char *new_syslog_name)
struct log_channel *lc = mb_alloc(log_pool, sizeof *lc);
log_unlock();
if (l->rf)
{
*lc = (struct log_channel) {
.filename = l->filename,
.backup = l->backup,
@ -586,12 +652,6 @@ log_switch(int initial, list *logs, const char *new_syslog_name)
(l->terminal_flag ? BIT32_VAL(LBPP_TERMINAL) : 0),
};
/* Mask union */
total_mask |= l->mask;
/* Message preparation flags */
flags |= lc->prepare;
/* Now the file handle ownership is transferred to the log channel */
l->rf = NULL;
@ -611,9 +671,79 @@ log_switch(int initial, list *logs, const char *new_syslog_name)
}
ll->rf = NULL;
}
}
else if (l->udp_port)
{
sock *sk;
ASSERT(l->udp_host || ipa_nonzero(l->udp_ip));
*lc = (struct log_channel) {
.new_mask = l->mask,
.prepare = BIT32_ALL(LBP_UDP_HEADER, LBP_MSG),
.udp_host = l->udp_host,
.udp_port = l->udp_port,
.udp_ip = l->udp_ip,
};
if (lc->udp_host && ipa_zero(lc->udp_ip))
{
const char *err_msg;
lc->udp_ip = resolve_hostname(lc->udp_host, SK_UDP, &err_msg);
if (ipa_zero(lc->udp_ip))
{
cf_warn("Cannot resolve hostname '%s': %s", l->udp_host, err_msg);
goto resolve_fail;
}
}
log_lock();
sk = sk_new(log_pool);
log_unlock();
sk->type = SK_UDP;
sk->daddr = lc->udp_ip;
sk->dport = lc->udp_port;
sk->flags = SKF_CONNECT;
if (sk_open(sk, &main_birdloop) < 0)
{
cf_warn("Cannot open UDP log socket: %s%#m", sk->err);
rfree(sk);
resolve_fail:
log_lock();
mb_free(lc);
log_unlock();
continue;
}
atomic_store_explicit(&lc->udp_sk, sk, memory_order_relaxed);
/* Find more */
for (struct log_config *ll = NODE_NEXT(l); NODE_VALID(ll); ll = NODE_NEXT(ll))
if (
(l->udp_port == ll->udp_port) && (
(l->udp_host && !strcmp(l->udp_host, ll->udp_host)) ||
(ipa_nonzero(l->udp_ip) && (ipa_equal(l->udp_ip, ll->udp_ip)))
))
{
/* Merged with this channel */
lc->new_mask |= ll->mask;
total_mask |= ll->mask;
ll->found_old = 1;
}
}
/* Mask union */
total_mask |= l->mask;
/* Store the new final local mask */
atomic_store_explicit(&lc->mask, lc->new_mask, memory_order_release);
/* Message preparation flags */
flags |= lc->prepare;
/* Insert into the main log list */
struct log_channel *head = atomic_load_explicit(&global_logs, memory_order_acquire);
do atomic_store_explicit(&lc->next, head, memory_order_release);
@ -635,7 +765,7 @@ log_switch(int initial, list *logs, const char *new_syslog_name)
atomic_store_explicit(&ol->mask, ol->new_mask, memory_order_release);
/* Never close syslog channel or debug */
if (ol->new_mask || !ol->rf || (ol->rf == dbg_rf))
if (ol->new_mask || (!ol->rf && !ol->udp_sk) || (ol->rf == dbg_rf))
{
pprev = &ol->next;
ol = atomic_load_explicit(pprev, memory_order_acquire);

5
sysdep/unix/unix.h
View File

@ -130,6 +130,7 @@ void rf_write_crude(struct rfile *, const char *, int);
extern struct rfile rf_stderr;
void test_old_bird(char *path);
ip_addr resolve_hostname(const char *host, int type, const char **err_msg);
/* krt.c bits */
@ -148,6 +149,10 @@ struct log_config {
const char *backup; /* Secondary filename (for log rotation) */
off_t limit; /* Log size limit */
int terminal_flag;
int found_old;
const char *udp_host; /* UDP log dst host name */
ip_addr udp_ip; /* UDP log dst IP address */
uint udp_port; /* UDP log dst port */
};
#endif