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/* ISC license. */
#include <sys/types.h>
#include <limits.h>
#include <skalibs/types.h>
#include <skalibs/sgetopt.h>
#include <skalibs/strerr.h>
#include <skalibs/exec.h>
#include <s6/config.h>
#define USAGE "s6-ipcserver [ -q | -Q | -v ] [ -d | -D ] [ -P | -p ] [ -1 ] [ -c maxconn ] [ -C localmaxconn ] [ -b backlog ] [ -a socketperms ] [ -G gid,gid,... ] [ -g gid ] [ -u uid ] [ -U ] path prog..."
#define dieusage() strerr_dieusage(100, USAGE)
int main (int argc, char const *const *argv)
{
unsigned int verbosity = 1 ;
int flag1 = 0 ;
int flagU = 0 ;
int flaglookup = 1 ;
int flagreuse = 1 ;
uid_t uid = 0 ;
gid_t gid = 0 ;
gid_t gids[NGROUPS_MAX] ;
size_t gidn = (size_t)-1 ;
unsigned int maxconn = 0 ;
unsigned int localmaxconn = 0 ;
unsigned int backlog = (unsigned int)-1 ;
unsigned int socketperms = 0777 ;
PROG = "s6-ipcserver" ;
{
subgetopt l = SUBGETOPT_ZERO ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "qQvDd1UPpc:C:b:a: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 'P' : flaglookup = 0 ; break ;
case 'p' : flaglookup = 1 ; 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 'a' : if (!uint0_oscan(l.arg, &socketperms)) 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 '1' : flag1 = 1 ; break ;
case 'U' : flagU = 1 ; uid = 0 ; gid = 0 ; gidn = (size_t)-1 ; break ;
default : dieusage() ;
}
}
argc -= l.ind ; argv += l.ind ;
if (argc < 2) dieusage() ;
}
{
size_t pos = 0 ;
unsigned int m = 0 ;
char fmt[UINT_FMT * 3 + 5 + UID_FMT + GID_FMT * (NGROUPS_MAX+1)] ;
char const *newargv[26 + argc] ;
newargv[m++] = S6_BINPREFIX "s6-ipcserver-socketbinder" ;
if (!flagreuse) newargv[m++] = "-D" ;
if (backlog != (unsigned int)-1)
{
if (!backlog) backlog = 1 ;
newargv[m++] = "-b" ;
newargv[m++] = fmt + pos ;
pos += uint_fmt(fmt + pos, backlog) ;
fmt[pos++] = 0 ;
}
if (socketperms != 0777)
{
newargv[m++] = "-a" ;
newargv[m++] = fmt + pos ;
fmt[pos++] = '0' ;
pos += uint_ofmt(fmt + pos, socketperms & 0777) ;
fmt[pos++] = 0 ;
}
newargv[m++] = "--" ;
newargv[m++] = *argv++ ;
if (flagU || uid || gid || gidn != (size_t)-1)
{
newargv[m++] = S6_BINPREFIX "s6-applyuidgid" ;
if (flagU) newargv[m++] = "-Uz" ;
if (uid)
{
newargv[m++] = "-u" ;
newargv[m++] = fmt + pos ;
pos += uid_fmt(fmt + pos, uid) ;
fmt[pos++] = 0 ;
}
if (gid)
{
newargv[m++] = "-g" ;
newargv[m++] = fmt + pos ;
pos += gid_fmt(fmt + pos, gid) ;
fmt[pos++] = 0 ;
}
if (gidn != (size_t)-1)
{
newargv[m++] = "-G" ;
newargv[m++] = fmt + pos ;
pos += gid_fmtlist(fmt + pos, gids, gidn) ;
fmt[pos++] = 0 ;
}
newargv[m++] = "--" ;
}
newargv[m++] = S6_BINPREFIX "s6-ipcserverd" ;
if (!verbosity) newargv[m++] = "-v0" ;
else if (verbosity == 2) newargv[m++] = "-v2" ;
if (flag1) newargv[m++] = "-1" ;
if (!flaglookup) newargv[m++] = "-P" ;
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 ;
xexec(newargv) ;
}
}
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