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/* ISC license. */
#include <sys/types.h>
#include <limits.h>
#include <skalibs/uint.h>
#include <skalibs/gidstuff.h>
#include <skalibs/sgetopt.h>
#include <skalibs/strerr2.h>
#include <skalibs/djbunix.h>
#include <skalibs/ip46.h>
#include <s6/config.h>
#include <s6-networking/config.h>
#define USAGE "s6-tcpserver [ -q | -Q | -v ] [ -4 | -6 ] [ -d | -D ] [ -1 ] [ -c maxconn ] [ -C localmaxconn ] [ -b backlog ] [ -G gid,gid,... ] [ -g gid ] [ -u uid ] [ -U ] ip port prog..."
#define dieusage() strerr_dieusage(100, USAGE)
int main (int argc, char const *const *argv, char const *const *envp)
{
unsigned int verbosity = 1 ;
int flag1 = 0 ;
int flagU = 0 ;
int flagreuse = 1 ;
unsigned int uid = 0, gid = 0 ;
gid_t gids[NGROUPS_MAX] ;
unsigned int gidn = (unsigned int)-1 ;
unsigned int maxconn = 0 ;
unsigned int localmaxconn = 0 ;
unsigned int backlog = (unsigned int)-1 ;
unsigned int what = 0 ;
PROG = "s6-tcpserver" ;
{
subgetopt_t l = SUBGETOPT_ZERO ;
for (;;)
{
register int opt = subgetopt_r(argc, argv, "qQvDd1U46c:C:b:u:g:G:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'q' : verbosity = 0 ; break ;
case 'Q' : verbosity = 1 ; break ;
case 'v' : verbosity = 2 ; break ;
case 'D' : flagreuse = 0 ; break ;
case 'd' : flagreuse = 1 ; break ;
case '4' : what = 4 ; break ;
case '6' : what = 6 ; break ;
case 'c' : if (!uint0_scan(l.arg, &maxconn)) dieusage() ; if (!maxconn) maxconn = 1 ; break ;
case 'C' : if (!uint0_scan(l.arg, &localmaxconn)) dieusage() ; if (!localmaxconn) localmaxconn = 1 ; break ;
case 'b' : if (!uint0_scan(l.arg, &backlog)) dieusage() ; break ;
case 'u' : if (!uint0_scan(l.arg, &uid)) dieusage() ; break ;
case 'g' : if (!uint0_scan(l.arg, &gid)) dieusage() ; break ;
case 'G' : if (!gid_scanlist(gids, NGROUPS_MAX, l.arg, &gidn) && *l.arg) dieusage() ; break ;
case '1' : flag1 = 1 ; break ;
case 'U' : flagU = 1 ; uid = 0 ; gid = 0 ; gidn = (unsigned int)-1 ; break ;
default : dieusage() ;
}
}
argc -= l.ind ; argv += l.ind ;
if (argc < 3) dieusage() ;
}
if (!what)
{
ip46_t ip ;
if (!ip46_scan(argv[0], &ip)) dieusage() ;
what = ip46_is6(&ip) ? 6 : 4 ;
}
{
unsigned int m = 0 ;
unsigned int pos = 0 ;
char fmt[UINT_FMT * 5 + GID_FMT * NGROUPS_MAX] ;
char const *newargv[23 + argc] ;
newargv[m++] = what == 6 ? S6_NETWORKING_BINPREFIX "s6-tcpserver6-socketbinder" : S6_NETWORKING_BINPREFIX "s6-tcpserver4-socketbinder" ;
if (!flagreuse) newargv[m++] = "-D" ;
if (backlog != (unsigned int)-1)
{
newargv[m++] = "-b" ;
newargv[m++] = fmt + pos ;
pos += uint_fmt(fmt + pos, backlog) ;
fmt[pos++] = 0 ;
}
newargv[m++] = "--" ;
newargv[m++] = *argv++ ;
newargv[m++] = *argv++ ;
if (flagU || uid || gid || gidn != (unsigned int)-1)
{
newargv[m++] = S6_EXTBINPREFIX "s6-applyuidgid" ;
if (flagU) newargv[m++] = "-Uz" ;
if (uid)
{
newargv[m++] = "-u" ;
newargv[m++] = fmt + pos ;
pos += uint_fmt(fmt + pos, uid) ;
fmt[pos++] = 0 ;
}
if (gid)
{
newargv[m++] = "-g" ;
newargv[m++] = fmt + pos ;
pos += uint_fmt(fmt + pos, gid) ;
fmt[pos++] = 0 ;
}
if (gidn != (unsigned int)-1)
{
newargv[m++] = "-G" ;
newargv[m++] = fmt + pos ;
pos += gid_fmtlist(fmt + pos, gids, gidn) ;
fmt[pos++] = 0 ;
}
newargv[m++] = "--" ;
}
newargv[m++] = what == 6 ? S6_NETWORKING_BINPREFIX "s6-tcpserver6d" : S6_NETWORKING_BINPREFIX "s6-tcpserver4d" ;
if (!verbosity) newargv[m++] = "-v0" ;
else if (verbosity == 2) newargv[m++] = "-v2" ;
if (flag1) newargv[m++] = "-1" ;
if (maxconn)
{
newargv[m++] = "-c" ;
newargv[m++] = fmt + pos ;
pos += uint_fmt(fmt + pos, maxconn) ;
fmt[pos++] = 0 ;
}
if (localmaxconn)
{
newargv[m++] = "-C" ;
newargv[m++] = fmt + pos ;
pos += uint_fmt(fmt + pos, localmaxconn) ;
fmt[pos++] = 0 ;
}
newargv[m++] = "--" ;
while (*argv) newargv[m++] = *argv++ ;
newargv[m++] = 0 ;
pathexec_run(newargv[0], newargv, envp) ;
strerr_dieexec(111, newargv[0]) ;
}
}
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