1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/* ISC license. */
#include <sys/types.h>
#include <limits.h>
#include <skalibs/uint64.h>
#include <skalibs/uint.h>
#include <skalibs/gidstuff.h>
#include <skalibs/sgetopt.h>
#include <skalibs/strerr2.h>
#include <skalibs/djbunix.h>
#include <s6/config.h>
#include <s6-networking/config.h>
#define USAGE "s6-tcpserver6 [ -v verbosity ] [ -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 ;
uint64 uid = 0 ;
gid_t 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 ;
PROG = "s6-tcpserver6" ;
{
subgetopt_t l = SUBGETOPT_ZERO ;
for (;;)
{
register int opt = subgetopt_r(argc, argv, "Dd1Uv:c:C:b:u:g:G:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'D' : flagreuse = 0 ; break ;
case 'd' : flagreuse = 1 ; break ;
case 'v' : if (!uint0_scan(l.arg, &verbosity)) dieusage() ; 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 (!uint640_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 = (unsigned int)-1 ; break ;
default : dieusage() ;
}
}
argc -= l.ind ; argv += l.ind ;
if (argc < 3) dieusage() ;
}
{
size_t pos = 0 ;
unsigned int m = 0 ;
char fmt[UINT_FMT * 4 + UINT64_FMT + GID_FMT * (NGROUPS_MAX + 1)] ;
char const *newargv[24 + argc] ;
newargv[m++] = S6_NETWORKING_BINPREFIX "s6-tcpserver6-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 ;
}
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 += uint64_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 != (unsigned int)-1)
{
newargv[m++] = "-G" ;
newargv[m++] = fmt + pos ;
pos += gid_fmtlist(fmt + pos, gids, gidn) ;
fmt[pos++] = 0 ;
}
newargv[m++] = "--" ;
}
newargv[m++] = S6_NETWORKING_BINPREFIX "s6-tcpserver6d" ;
if (verbosity != 1)
{
newargv[m++] = "-v" ;
newargv[m++] = fmt + pos ;
pos += uint_fmt(fmt + pos, verbosity) ;
fmt[pos++] = 0 ;
}
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]) ;
}
}
|
