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lines.c
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lines.c
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/*
* Copyright (c) 2021 The University of Queensland
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This software was written by David Gwynne <[email protected]> for the
* Faculty of Engineering, Architecture and Information Technology.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <ctype.h>
#include <pwd.h>
#include <netdb.h>
#include <uuid.h>
#include <errno.h>
#include <err.h>
#include <assert.h>
#include <tls.h>
#include <event.h>
#include <libpq-fe.h>
#include "log.h"
#ifndef min
#define min(_a, _b) ((_a) < (_b) ? (_a) : (_b))
#endif
static inline int
istrailer(int ch)
{
return (ch == '\0' || isspace(ch));
}
#define LINES_USER "_lined"
#define LINES_PORT_UDP "601"
#define LINES_PORT_TCP "601"
#define LINES_PORT_TLS "syslog-tls"
#define LINES_BUFLEN (1 << 10)
#define LINES_BUFLEN_MAX (256 << 10)
struct refcnt {
unsigned int refs;
};
enum syslog_state {
S_IDLE,
S_MSG_LEN,
S_OCTETS,
S_LINE,
S_UTF8_3,
S_UTF8_2,
S_UTF8_1,
S_DEAD,
};
enum db_state {
SDB_RESET,
SDB_PREPARE,
SDB_PREPARING,
SDB_IDLE,
SDB_BEGIN,
SDB_BEGINNING,
SDB_QUERY,
SDB_RESULT,
SDB_COMMIT,
SDB_COMMITTING
};
/*
* 2021-07-30 16:45:00.123456+10:00
* 1 2 3 32
* 01234567890123456789012345678901
*/
#define TIMESTAMPTZ_LEN 33
static const char insert_stmt[] = "ins_stmt";
static const char insert[] = "INSERT INTO \"messages\" ("
"\"saddr\", \"sport\", \"daddr\", \"dport\", "
"\"conn\", \"seq\", "
"\"ts\", \"id\", \"type\", "
"\"msg\""
") VALUES ("
"$1, $2, $3, $4, "
"$5, $6, "
"$7, $8, $9, $10"
")";
#define INSERT_PARAMS 10
static const char type_syslog[] = "syslog";
struct message {
TAILQ_ENTRY(message) entry;
void (*dtor)(struct message *);
void *cookie;
const char *type;
char ts[TIMESTAMPTZ_LEN];
char *id;
char *laddr;
char *lport;
char *raddr;
char *rport;
char *connid;
unsigned int seq;
size_t buflen;
unsigned char buf[1]; /* must be last */
/*
* this is followed by extra bytes that store the actual
* message. the one byte buf is used to account for a
* terminating '\0' if needed.
*/
};
TAILQ_HEAD(messages, message);
#define MESSAGES_INITIALIZER(_msgs) TAILQ_HEAD_INITIALIZER(_msgs)
static inline int
messages_empty(struct messages *msgs)
{
return (TAILQ_EMPTY(msgs));
}
static inline struct message *
messages_first(struct messages *msgs)
{
return (TAILQ_FIRST(msgs));
}
static inline void
messages_remove(struct messages *msgs, struct message *msg)
{
TAILQ_REMOVE(msgs, msg, entry);
}
static inline void
messages_insert_tail(struct messages *msgs, struct message *msg)
{
TAILQ_INSERT_TAIL(msgs, msg, entry);
}
static const struct timeval messages_wait = { 1, 0 };
static const unsigned int messages_limit = 1000;
struct conn {
struct server *server;
struct event rev;
struct event wev;
struct tls *tls_ctx;
struct refcnt refs;
unsigned int seq;
char *id;
char *laddr;
char *lport;
char *raddr;
char *rport;
/* state of the buffer */
unsigned char *buf;
size_t buflen;
/* state of the message */
unsigned int state;
struct timespec ts;
size_t head;
size_t tail;
size_t next;
size_t octets;
};
struct listener {
TAILQ_ENTRY(listener) entry;
struct server *server;
const char *host;
const char *port;
struct event ev;
};
TAILQ_HEAD(listeners, listener);
struct receiver {
TAILQ_ENTRY(receiver) entry;
struct server *server;
struct event ev;
int (*cmsg2dst)(struct sockaddr_storage *,
struct cmsghdr *);
};
TAILQ_HEAD(receivers, receiver);
enum tx_state {
STX_IDLE,
STX_BEGIN,
STX_MSGS,
STX_COMMIT,
};
struct transaction {
TAILQ_ENTRY(transaction) entry;
struct server *server;
struct messages messages;
struct message *message;
enum tx_state state;
};
TAILQ_HEAD(transactions, transaction);
struct server {
struct listeners listeners;
struct listeners slisteners;
struct receivers receivers;
enum db_state db_state;
PGconn *db;
struct event db_rev;
struct event db_wev;
struct messages messages;
unsigned int messages_num;
struct event messages_tmo;
struct transactions transactions;
struct transaction *transaction;
struct tls *tls_ctx;
struct tls_config *tls_cfg;
};
static void listeners_bind(struct listeners *,
int, const char *, const char *);
static void receivers_bind(struct server *s, int,
const char *, const char *);
static void server_listen(struct server *s);
static void server_slisten(struct server *s);
static void server_receive(struct server *s);
static void listener_accept(struct listener *, int, int);
static void listener_accept_ev(int, short, void *);
static void slistener_accept_ev(int, short, void *);
static void syslog_recv(int, short, void *);
static int receiver_dst4(struct sockaddr_storage *, struct cmsghdr *);
static int receiver_dst6(struct sockaddr_storage *, struct cmsghdr *);
static void syslog_read(int, short, void *);
static void syslog_tls_io(int, short, void *);
static void syslog_tls_hs(int, short, void *);
static void syslog_input(struct conn *, size_t);
static void db_connect(struct server *, const char *);
static void db_read(int, short, void *);
static void db_write(int, short, void *);
static char *id_gen(void);
static void timestamptz(char *, size_t, const struct timespec *)
__attribute__ ((__bounded__(__buffer__,1,2)));
static void message_store(struct server *, struct message *);
static void message_free(struct message *);
static void messages_push(int, short, void *);
static void
refcnt_init(struct refcnt *r)
{
r->refs = 1;
}
static void
refcnt_take(struct refcnt *r)
{
++r->refs;
}
static int
refcnt_rele(struct refcnt *r)
{
return (--r->refs == 0);
}
__dead static void
usage(void)
{
extern char *__progname;
fprintf(stderr, "usage: %s [-46d] [-A CA_path] [-a CA_file] "
"[-c cert_file] [-k key_file]\n"
"\t[-l address] [-S tls_port] [-T tcp_port] [-U udp_port]\n"
"\t[-u user]\n", __progname);
exit(1);
}
static void
gcore(void)
{
pid_t p;
p = fork();
switch (p) {
case -1:
lwarn("gcore fork"); /* XXX */
return;
case 0: /* child */
/* crash */
abort();
/* NOTREACHED */
default:
return;
}
}
int debug = 0;
static const char *
lines_port_opt(const char *arg)
{
if (strcmp(arg, "-") == 0)
return (NULL);
return (arg);
}
int
main(int argc, char *argv[])
{
struct server server = {
.listeners = TAILQ_HEAD_INITIALIZER(server.listeners),
.slisteners = TAILQ_HEAD_INITIALIZER(server.slisteners),
.receivers = TAILQ_HEAD_INITIALIZER(server.receivers),
.messages = MESSAGES_INITIALIZER(server.messages),
.transactions = TAILQ_HEAD_INITIALIZER(server.transactions),
};
struct server *s = &server;
int family = AF_UNSPEC;
const char *host = NULL;
const char *port_udp = LINES_PORT_UDP;
const char *port_tcp = LINES_PORT_TCP;
const char *port_tls = LINES_PORT_TLS;
const char *user = LINES_USER;
const char *conn = "";
const char *crt = NULL;
const char *key = NULL;
const char *catype = NULL;
const char *capath = NULL;
int (*cafunc)(struct tls_config *, const char *) = NULL;
int ch;
struct passwd *pw;
while ((ch = getopt(argc, argv, "46A:a:c:dk:l:p:S:T:U:u:")) != -1) {
switch (ch) {
case '4':
family = AF_INET;
break;
case '6':
family = AF_INET6;
break;
case 'A':
catype = "path";
capath = optarg;
cafunc = tls_config_set_ca_path;
break;
case 'a':
catype = "file";
capath = optarg;
cafunc = tls_config_set_ca_file;
break;
case 'c':
crt = optarg;
break;
case 'd':
debug = 1;
break;
case 'k':
key = optarg;
break;
case 'l':
host = optarg;
break;
case 'p':
conn = optarg;
break;
case 'S':
port_tls = lines_port_opt(optarg);
break;
case 'T':
port_tcp = lines_port_opt(optarg);
break;
case 'U':
port_udp = lines_port_opt(optarg);
break;
case 'u':
user = optarg;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc > 0)
usage();
if ((crt == NULL) != (key == NULL)) {
warnx("key and certificate must be configured together");
usage();
}
if (geteuid() != 0)
errx(1, "need root privileges");
pw = getpwnam(user);
if (pw == NULL)
errx(1, "no %s user", user);
if (chdir(pw->pw_dir) == -1)
err(1, "%s", pw->pw_dir);
if (port_udp != NULL)
receivers_bind(s, family, host, port_udp);
if (port_tcp != NULL)
listeners_bind(&s->listeners, family, host, port_tcp);
if (crt != NULL) {
if (port_tls == NULL)
errx(1, "TLS configured but listener disabled");
listeners_bind(&s->slisteners, family, host, port_tls);
if (tls_init() == -1)
errx(1, "tls init failed");
s->tls_cfg = tls_config_new();
if (s->tls_cfg == NULL)
errx(1, "tls server configuration creation failed");
if (tls_config_set_cert_file(s->tls_cfg, crt) == -1) {
errx(1, "TLS certificate: %s",
tls_config_error(s->tls_cfg));
}
if (tls_config_set_key_file(s->tls_cfg, key) == -1) {
errx(1, "TLS key: %s",
tls_config_error(s->tls_cfg));
}
if (capath != NULL) {
if ((*cafunc)(s->tls_cfg, capath) == -1) {
errx(1, "CA %s: %s", catype,
tls_config_error(s->tls_cfg));
}
tls_config_verify_client(s->tls_cfg);
} else {
warnx("TLS client certificate verification "
"is not configured");
}
s->tls_ctx = tls_server();
if (s->tls_ctx == NULL)
errx(1, "tls server context creation failed");
if (tls_configure(s->tls_ctx, s->tls_cfg) != 0)
errx(1, "TLS server configuration: %s",
tls_error(s->tls_ctx));
}
if (TAILQ_EMPTY(&s->receivers) &&
TAILQ_EMPTY(&s->listeners) &&
TAILQ_EMPTY(&s->slisteners))
errx(1, "no protocols enabled");
if (setgroups(1, &pw->pw_gid) ||
setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
errx(1, "can't drop privileges");
pw = NULL;
endpwent();
db_connect(s, conn);
signal(SIGPIPE, SIG_IGN);
signal(SIGCHLD, SIG_IGN); /* gcore help */
if (!debug) {
extern char *__progname;
if (daemon(1, 0) == -1)
err(1, "daemon");
logger_syslog(__progname);
}
event_init();
event_set(&s->db_rev, PQsocket(s->db), EV_READ|EV_PERSIST,
db_read, s);
event_set(&s->db_wev, PQsocket(s->db), EV_WRITE,
db_write, s);
evtimer_set(&s->messages_tmo, messages_push, s);
s->db_state = SDB_IDLE;
event_add(&s->db_rev, 0);
server_listen(s);
server_slisten(s);
server_receive(s);
event_dispatch();
return (0);
}
static void
listeners_bind(struct listeners *list,
int af, const char *host, const char *port)
{
struct listeners listeners = TAILQ_HEAD_INITIALIZER(listeners);
struct listener *l;
struct addrinfo hints, *res, *res0;
int error;
int serrno;
const char *cause;
int fd;
int reuse;
memset(&hints, 0, sizeof(hints));
hints.ai_family = af;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
error = getaddrinfo(host, port, &hints, &res0);
if (error != 0) {
errx(1, "listener %s port %s: %s",
host ? host : "*", port, gai_strerror(error));
}
for (res = res0; res != NULL; res = res->ai_next) {
fd = socket(res->ai_family, res->ai_socktype | SOCK_NONBLOCK,
res->ai_protocol);
if (fd == -1) {
serrno = errno;
cause = "socket";
continue;
}
reuse = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
&reuse, sizeof(reuse)) == -1) {
warn("listener %s port %s enable reuse addr",
host ? host : "*", port);
}
if (bind(fd, res->ai_addr, res->ai_addrlen) == -1) {
serrno = errno;
cause = "bind";
close(fd);
continue;
}
if (listen(fd, 5) == -1) {
serrno = errno;
cause = "bind";
close(fd);
continue;
}
l = malloc(sizeof(*l));
if (l == NULL)
err(1, "listener alloc");
event_set(&l->ev, fd, 0, NULL, NULL);
TAILQ_INSERT_TAIL(&listeners, l, entry);
}
if (TAILQ_EMPTY(&listeners)) {
errc(1, serrno, "listener %s port %s %s",
host ? host : "*", port, cause);
}
TAILQ_CONCAT(list, &listeners, entry);
}
static void
receivers_bind(struct server *s, int af, const char *host, const char *port)
{
struct receivers receivers = TAILQ_HEAD_INITIALIZER(receivers);
struct receiver *r;
int (*cmsg2dst)(struct sockaddr_storage *, struct cmsghdr *);
struct addrinfo hints, *res, *res0;
int error;
int serrno;
const char *cause;
int fd;
int on;
memset(&hints, 0, sizeof(hints));
hints.ai_family = af;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
hints.ai_flags = AI_PASSIVE;
error = getaddrinfo(host, port, &hints, &res0);
if (error != 0) {
errx(1, "receiver %s port %s: %s",
host ? host : "*", port,
gai_strerror(error));
}
for (res = res0; res != NULL; res = res->ai_next) {
fd = socket(res->ai_family, res->ai_socktype | SOCK_NONBLOCK,
res->ai_protocol);
if (fd == -1) {
serrno = errno;
cause = "socket";
continue;
}
on = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
&on, sizeof(on)) == -1) {
warn("receiver %s port %s enable reuse addr",
host ? host : "*", port);
}
if (bind(fd, res->ai_addr, res->ai_addrlen) == -1) {
serrno = errno;
cause = "bind";
close(fd);
continue;
}
switch (res->ai_family) {
case AF_INET:
cmsg2dst = receiver_dst4;
on = 1;
if (setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR,
&on, sizeof(on)) == -1)
err(1, "setsockopt(IP_RECVDSTADDR)");
on = 1;
if (setsockopt(fd, IPPROTO_IP, IP_RECVDSTPORT,
&on, sizeof(on)) == -1)
err(1, "setsockopt(IP_RECVDSTPORT)");
break;
case AF_INET6:
cmsg2dst = receiver_dst6;
on = 1;
if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO,
&on, sizeof(on)) == -1)
err(1, "setsockopt(IPV6_RECVPKTINFO)");
on = 1;
if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVDSTPORT,
&on, sizeof(on)) == -1)
err(1, "setsockopt(IPV6_RECVDSTPORT)");
break;
}
r = malloc(sizeof(*r));
if (r == NULL)
err(1, "receiver alloc");
r->cmsg2dst = cmsg2dst;
event_set(&r->ev, fd, 0, NULL, NULL);
TAILQ_INSERT_TAIL(&receivers, r, entry);
}
if (TAILQ_EMPTY(&receivers)) {
errc(1, serrno, "receiver %s port %s %s",
host ? host : "*", port, cause);
}
TAILQ_CONCAT(&s->receivers, &receivers, entry);
}
static void
server_listen(struct server *s)
{
struct listener *l;
TAILQ_FOREACH(l, &s->listeners, entry) {
l->server = s;
event_set(&l->ev, EVENT_FD(&l->ev), EV_READ|EV_PERSIST,
listener_accept_ev, l);
event_add(&l->ev, NULL);
}
}
static void
server_slisten(struct server *s)
{
struct listener *l;
TAILQ_FOREACH(l, &s->slisteners, entry) {
l->server = s;
event_set(&l->ev, EVENT_FD(&l->ev), EV_READ|EV_PERSIST,
slistener_accept_ev, l);
event_add(&l->ev, NULL);
}
}
static void
server_receive(struct server *s)
{
struct receiver *r;
TAILQ_FOREACH(r, &s->receivers, entry) {
r->server = s;
event_set(&r->ev, EVENT_FD(&r->ev), EV_READ|EV_PERSIST,
syslog_recv, r);
event_add(&r->ev, NULL);
}
}
static void
db_send_query(struct server *s, const char *query)
{
assert(s->db_state == SDB_IDLE);
if (!PQsendQuery(s->db, query))
lerrx(ENOMEM, "DB send %s: %s", query, PQerrorMessage(s->db));
s->db_state = SDB_QUERY;
/* try and push the query out quickly */
db_write(PQsocket(s->db), EV_WRITE, s);
}
static void
db_send_message(struct transaction *t)
{
struct server *s = t->server;
struct message *msg = t->message;
char seq[32];
int rv;
const char *values[INSERT_PARAMS] = {
msg->raddr, msg->rport, msg->laddr, msg->lport,
msg->connid, seq,
msg->ts, msg->id, type_syslog, msg->buf
};
int lengths[INSERT_PARAMS] = {
0, 0, 0, 0,
0, 0,
0, 0, 0, 1,
};
int formats[INSERT_PARAMS] = {
0, 0, 0, 0,
0, 0,
0, 0, 0, (int)msg->buflen,
};
assert(s->db_state == SDB_IDLE);
if (msg->connid != NULL) {
rv = snprintf(seq, sizeof(seq), "%lld", (long long)msg->seq);
if (rv < 0)
lerrx(1, "%s: seq encoding error", __func__);
if ((size_t)rv >= sizeof(seq))
lerrx(1, "%s: seq buffer too small", __func__);
} else
values[5] = NULL;
if (0) {
ldebug("%s %s: %s/%s -> %s/%s: \"%s\"",
msg->ts, msg->id,
msg->raddr, msg->rport, msg->laddr, msg->lport,
msg->buf);
}
if (!PQsendQueryPrepared(s->db, insert_stmt, INSERT_PARAMS,
values, formats, lengths, 0))
lerrx(ENOMEM, "DB send query: %s", PQerrorMessage(s->db));
s->db_state = SDB_QUERY;
/* try and push the query out quickly */
db_write(PQsocket(s->db), EV_WRITE, s);
}
static void
db_send_transaction(struct server *s)
{
struct transaction *t = s->transaction;
assert(s->db_state == SDB_IDLE);
assert(t->message == NULL);
assert(t->state == STX_IDLE);
t->state = STX_BEGIN;
db_send_query(s, "BEGIN");
}
static void
message_store(struct server *s, struct message *msg)
{
unsigned int n;
messages_insert_tail(&s->messages, msg);
n = ++s->messages_num;
if (n == 1) {
#if 0
ldebug("scheduling transaction");
#endif
evtimer_add(&s->messages_tmo, &messages_wait);
} else if (n >= messages_limit) {
#if 0
ldebug("message limit %u hit", messages_limit);
#endif
evtimer_del(&s->messages_tmo);
messages_push(0, 0, s);
}
}
static void
messages_free(struct messages *msgs)
{
struct message *msg, *nmsg;
TAILQ_FOREACH_SAFE(msg, msgs, entry, nmsg) {
messages_remove(msgs, msg);
message_free(msg);
}
}
static void
db_push(struct server *s)
{
if (s->transaction == NULL) {
struct transaction *t = TAILQ_FIRST(&s->transactions);
assert(t != NULL);
assert(!messages_empty(&t->messages));
TAILQ_REMOVE(&s->transactions, t, entry);
s->transaction = t;
}
if (s->db_state == SDB_IDLE)
db_send_transaction(s);
}
static void
messages_push(int nil, short events, void *arg)
{
struct server *s = arg;
struct transaction *t;
t = malloc(sizeof(*t));
if (t == NULL) {
messages_free(&s->messages);
lwarn("unable to allocate transaction, dropping %u %s",
s->messages_num,
s->messages_num == 1 ? "message" : "messages");
TAILQ_INIT(&s->messages); /* this should be a nop */
s->messages_num = 0;
return;
}
#if 0
ldebug("pushing transaction for %u %s",
s->messages_num,
s->messages_num == 1 ? "message" : "messages");
#endif
t->server = s;
TAILQ_INIT(&t->messages);
t->message = NULL;
t->state = STX_IDLE;
TAILQ_CONCAT(&t->messages, &s->messages, entry);
TAILQ_INIT(&s->messages);
s->messages_num = 0;
TAILQ_INSERT_TAIL(&s->transactions, t, entry);
db_push(s);
}
static void
listener_accept_ev(int fd, short events, void *arg)
{
listener_accept(arg, fd, 0);
}
static void
slistener_accept_ev(int fd, short events, void *arg)
{
listener_accept(arg, fd, 1);
}
static int
setsockint(int s, int level, int optname, int i)
{
return (setsockopt(s, level, optname, &i, sizeof(i)));
}
static void
listener_accept(struct listener *l, int fd, int tls)
{
struct conn *conn;
int cfd;
struct sockaddr_storage ss;
socklen_t sslen = sizeof(ss);
char host[NI_MAXHOST];
char serv[NI_MAXSERV];
int error;
cfd = accept4(fd, (struct sockaddr *)&ss, &sslen, SOCK_NONBLOCK);
if (cfd == -1) {
switch (errno) {
case EINTR:
case EAGAIN:
break;
default:
lwarn("accept");
break;
}
return;
}
error = getnameinfo((struct sockaddr *)&ss, sslen,
host, sizeof(host), serv, sizeof(serv),
NI_NUMERICHOST|NI_NUMERICSERV);
if (error != 0) {
lwarnx("connection name lookup: %s", gai_strerror(error));
goto close;
}
conn = malloc(sizeof(*conn));
if (conn == NULL) {
lwarn("%s port %s connection", host, serv);
goto close;
}
conn->id = id_gen();
if (conn->id == NULL) {
lwarn("%s port %s connection id", host, serv);
goto free_conn;
}
conn->raddr = strdup(host);
if (conn->raddr == NULL) {
lwarn("%s port %s connection raddr", host, serv);
goto free_id;
}
conn->rport = strdup(serv);
if (conn->rport == NULL) {
lwarn("%s port %s connection rport", host, serv);
goto free_raddr;
}