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/* ISC license. */
#include <stdint.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <signal.h>
#include <errno.h>
#include <limits.h>
#include <skalibs/types.h>
#include <skalibs/sgetopt.h>
#include <skalibs/allreadwrite.h>
#include <skalibs/buffer.h>
#include <skalibs/error.h>
#include <skalibs/strerr.h>
#include <skalibs/tai.h>
#include <skalibs/iopause.h>
#include <skalibs/djbunix.h>
#include <skalibs/socket.h>
#include <skalibs/ip46.h>
#include <skalibs/setgroups.h>
#include <skalibs/sig.h>
#include <skalibs/selfpipe.h>
#include "lolsyslog.h"
#define USAGE "s6-socklog [ -d notif ] [ -r ] [ -U | -u uid -g gid -G gidlist ] [ -l linelen ] [ -t lameducktimeout ] [ -x socket | -i ip_port ]"
#define dieusage() strerr_dieusage(100, USAGE)
static tain lameducktto = TAIN_INFINITE_RELATIVE ;
static int cont = 1 ;
static inline void handle_signals (void)
{
for (;;) switch (selfpipe_read())
{
case -1 : strerr_diefu1sys(111, "selfpipe_read()") ;
case 0 : return ;
case SIGTERM :
cont = 0 ;
tain_add_g(&lameducktto, &lameducktto) ;
break ;
default : break ;
}
}
int main (int argc, char const *const *argv)
{
iopause_fd x[3] = { { .events = IOPAUSE_READ }, { .fd = 1 } } ;
int flagraw = 0 ;
int is6 = 0 ;
char const *usock = "/dev/log" ;
unsigned int linelen = 1024 ;
PROG = "s6-socklog" ;
{
subgetopt l = SUBGETOPT_ZERO ;
unsigned int notif = 0 ;
unsigned int t = 0 ;
uid_t uid = 0 ;
gid_t gid = 0 ;
gid_t gids[NGROUPS_MAX + 1] ;
size_t gidn = (size_t)-1 ;
ip46 ip ;
uint16_t port = 514 ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "rd:l:t:u:g:G:Ux:i:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'r' : flagraw = 1 ; break ;
case 'd' : if (!uint0_scan(l.arg, ¬if)) dieusage() ; break ;
case 'l' : if (!uint0_scan(l.arg, &linelen)) dieusage() ; break ;
case 't' : if (!uint0_scan(l.arg, &t)) dieusage() ; break ;
case 'u' : if (!uid0_scan(l.arg, &uid)) dieusage() ; break ;
case 'g' : if (!gid0_scan(l.arg, &gid)) dieusage() ; break ;
case 'G' : if (!gid_scanlist(gids, NGROUPS_MAX, l.arg, &gidn) && *l.arg) dieusage() ; break ;
case 'U' :
{
char const *x = getenv("UID") ;
if (!x) strerr_dienotset(100, "UID") ;
if (!uid0_scan(x, &uid)) strerr_dieinvalid(100, "UID") ;
x = getenv("GID") ;
if (!x) strerr_dienotset(100, "GID") ;
if (!gid0_scan(x, &gid)) strerr_dieinvalid(100, "GID") ;
x = getenv("GIDLIST") ;
if (!x) strerr_dienotset(100, "GIDLIST") ;
if (!gid_scanlist(gids, NGROUPS_MAX+1, x, &gidn) && *x)
strerr_dieinvalid(100, "GIDLIST") ;
break ;
}
case 'x' : usock = l.arg ; break ;
case 'i' :
{
size_t pos = ip46_scan(l.arg, &ip) ;
if (!pos) dieusage() ;
if (l.arg[pos] == '_' || (!ip46_is6(&ip) && l.arg[pos] == ':'))
if (!uint160_scan(l.arg + pos + 1, &port)) dieusage() ;
usock = 0 ;
break ;
}
default : dieusage() ;
}
}
argc -= l.ind ; argv += l.ind ;
if (linelen < 76) linelen = 76 ;
if (linelen > 1048576) linelen = 1048576 ;
if (t) tain_from_millisecs(&lameducktto, t) ;
if (notif)
{
if (notif < 3) strerr_dief1x(100, "notification fd must be 3 or more") ;
if (fcntl(notif, F_GETFD) < 0) strerr_dief1sys(100, "invalid notification fd") ;
}
close(0) ;
if (fcntl(1, F_GETFD) < 0) strerr_dief2sys(100, "invalid std", "out") ;
if (fcntl(2, F_GETFD) < 0) strerr_dief2sys(100, "invalid std", "err") ;
if (usock)
{
x[2].fd = ipc_datagram_nbcoe() ;
if (x[2].fd == -1) strerr_diefu1sys(111, "create socket") ;
if (ipc_bind_reuse_perms(x[2].fd, usock, 0777) == -1)
strerr_diefu2sys(111, "bind socket to ", usock) ;
}
else
{
x[2].fd = socket_udp46_nbcoe(ip46_is6(&ip)) ;
if (x[2].fd == -1) strerr_diefu1sys(111, "create socket") ;
if (socket_bind46_reuse(x[2].fd, &ip, port) == -1)
{
char fmti[IP46_FMT] ;
char fmtp[UINT16_FMT] ;
fmti[ip46_fmt(fmti, &ip)] = 0 ;
fmtp[uint16_fmt(fmtp, port)] = 0 ;
strerr_diefu5sys(111, "bind socket to ", "ip ", fmti, " port ", fmtp) ;
}
is6 = ip46_is6(&ip) ;
}
if (gidn != (size_t)-1 && setgroups_and_gid(gid ? gid : getegid(), gidn, gids) < 0)
strerr_diefu1sys(111, "set supplementary group list") ;
if (gid && setgid(gid) < 0)
strerr_diefu1sys(111, "setgid") ;
if (uid && setuid(uid) < 0)
strerr_diefu1sys(111, "setuid") ;
x[0].fd = selfpipe_init() ;
if (x[0].fd == -1) strerr_diefu1sys(111, "init selfpipe") ;
if (!sig_altignore(SIGPIPE)) strerr_diefu1sys(111, "ignore SIGPIPE") ;
if (!selfpipe_trap(SIGTERM)) strerr_diefu1sys(111, "trap signals") ;
tain_now_set_stopwatch_g() ;
if (notif)
{
fd_write(notif, "\n", 1) ;
fd_close(notif) ;
}
}
{
char outbuf[linelen << 2] ;
buffer b1 = BUFFER_INIT(&buffer_write, 1, outbuf, linelen << 2) ;
char line[linelen + 1] ;
while (cont || buffer_len(&b1))
{
ssize_t r ;
x[1].events = buffer_len(&b1) ? IOPAUSE_WRITE : 0 ;
x[2].events = cont && buffer_available(&b1) >= linelen + 80 ? IOPAUSE_READ : 0 ;
r = iopause_g(x, 3, cont ? &tain_infinite : &lameducktto) ;
if (r == -1) strerr_diefu1sys(111, "iopause") ;
if (!r) return 99 ;
if (x[0].revents & IOPAUSE_READ) handle_signals() ;
if (x[1].events & x[1].revents & IOPAUSE_WRITE)
if (!buffer_flush(&b1) && !error_isagain(errno))
strerr_diefu1sys(111, "write to stdout") ;
if (x[2].events & x[2].revents & IOPAUSE_READ)
{
if (usock)
{
r = sanitize_read(fd_recv(x[2].fd, line, linelen + 1, 0)) ;
if (r == -1) strerr_diefu1sys(111, "recv") ;
}
else
{
ip46 ip ;
uint16_t port ;
r = sanitize_read(socket_recv46(x[2].fd, line, linelen + 1, &ip, &port, is6)) ;
if (r == -1) strerr_diefu1sys(111, "recv") ;
if (r)
{
char fmt[IP46_FMT + UINT16_FMT + 3] ;
size_t m = ip46_fmt(fmt, &ip) ;
fmt[m++] = '_' ;
m += uint16_fmt(fmt + m, port) ;
fmt[m++] = ':' ; fmt[m++] = ' ' ;
buffer_putnoflush(&b1, fmt, m) ;
}
}
if (r)
{
size_t len = r ;
size_t pos = 0 ;
while (r && (!line[r-1] || line[r-1] == '\n')) r-- ;
for (size_t i = 0 ; i < r ; i++)
if (!line[i] || line[i] == '\n') line[i] = '~' ;
if (!flagraw)
{
char sbuf[LOLSYSLOG_STRING] ;
pos = lolsyslog_string(sbuf, line) ;
if (pos) buffer_putsnoflush(&b1, sbuf) ;
}
buffer_putnoflush(&b1, line + pos, r - pos) ;
if (len == linelen+1) buffer_putnoflush(&b1, "...", 3) ;
buffer_putnoflush(&b1, "\n", 1) ;
}
}
}
}
return 0 ;
}
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