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Generate a tinc-up script from an invitation.

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This adds the ability for an invitation to provision an invitee with a
tinc-up script. This is quite strictly controlled; only address configuration
and routes are supported by adding "Ifconfig" and "Route" statements to
the invitation file. The "tinc join" command will generate a tinc-up script
from those statements, and will ask before enabling the tinc-up script.
This commit is contained in:
Guus Sliepen 2016-04-17 01:13:27 +02:00
parent b2200f2166
commit 3273e32541
4 changed files with 282 additions and 0 deletions
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src/ifconfig.c Normal file
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/*
ifconfig.c -- Generate platform specific interface configuration commands
Copyright (C) 2016 Guus Sliepen <guus@tinc-vpn.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "system.h"
#include "conf.h"
#include "ifconfig.h"
#include "subnet.h"
static long start;
#ifndef HAVE_MINGW
void ifconfig_header(FILE *out) {
fprintf(out, "#!/bin/sh\n");
start = ftell(out);
}
void ifconfig_dhcp(FILE *out) {
fprintf(out, "dhclient -nw \"$INTERFACE\"\n");
}
void ifconfig_dhcp6(FILE *out) {
fprintf(out, "dhclient -6 -nw \"$INTERFACE\"\n");
}
void ifconfig_slaac(FILE *out) {
#ifdef HAVE_LINUX
fprintf(out, "echo 1 >\"/proc/sys/net/ipv6/conf/$INTERFACE/accept_ra\"\n");
fprintf(out, "echo 1 >\"/proc/sys/net/ipv6/conf/$INTERFACE/autoconf\"\n");
#else
fprintf(out, "rtsol \"$INTERFACE\" &\n");
#endif
}
bool ifconfig_footer(FILE *out) {
if(ftell(out) == start) {
fprintf(out, "echo 'Unconfigured tinc-up script, please edit '$0'!'\n\n#ifconfig $INTERFACE <your vpn IP address> netmask <netmask of whole VPN>\n");
return false;
} else {
#ifdef HAVE_LINUX
fprintf(out, "ip link set \"$INTERFACE\" up\n");
#else
fprintf(out, "ifconfig \"$INTERFACE\" up\n");
#endif
return true;
}
}
#else
void ifconfig_header(FILE *out) {
start = ftell(out);
}
void ifconfig_dhcp(FILE *out) {
fprintf(out, "netsh interface ipv4 set address \"%INTERFACE%\" dhcp\n");
}
void ifconfig_dhcp6(FILE *out) {
fprintf(stderr, "DHCPv6 requested, but not supported by tinc on this platform\n");
}
void ifconfig_slaac(FILE *out) {
// It's the default?
}
bool ifconfig_footer(FILE *out) {
return ftell(out) != start;
}
#endif
static subnet_t ipv4, ipv6;
void ifconfig_address(FILE *out, const char *value) {
subnet_t subnet = {};
char str[MAXNETSTR];
if(!str2net(&subnet, value) || !net2str(str, sizeof str, &subnet)) {
fprintf(stderr, "Could not parse Ifconfig statement\n");
return;
}
switch(subnet.type) {
case SUBNET_IPV4: ipv4 = subnet; break;
case SUBNET_IPV6: ipv6 = subnet; break;
}
#if defined(HAVE_LINUX)
switch(subnet.type) {
case SUBNET_MAC: fprintf(out, "ip link set \"$INTERFACE\" address %s\n", str); break;
case SUBNET_IPV4: fprintf(out, "ip addr replace %s dev \"$INTERFACE\"\n", str); break;
case SUBNET_IPV6: fprintf(out, "ip addr replace %s dev \"$INTERFACE\"\n", str); break;
}
#elif defined(HAVE_BSD)
switch(subnet.type) {
case SUBNET_MAC: fprintf(out, "ifconfig \"$INTERFACE\" link %s\n", str); break;
case SUBNET_IPV4: fprintf(out, "ifconfig \"$INTERFACE\" %s\n", str); break;
case SUBNET_IPV6: fprintf(out, "ifconfig \"$INTERFACE\" inet6 %s\n", str); break;
}
#elif defined(HAVE_MINGW) || defined(HAVE_CYGWIN)
switch(subnet.type) {
case SUBNET_MAC: fprintf(out, "ip link set \"$INTERFACE\" address %s\n", str); break;
case SUBNET_IPV4: fprintf(out, "netsh inetface ipv4 set address \"$INTERFACE\" static %s\n", str); break;
case SUBNET_IPV6: fprintf(out, "netsh inetface ipv6 set address \"$INTERFACE\" static %s\n", str); break;
}
#endif
}
void ifconfig_route(FILE *out, const char *value) {
subnet_t subnet = {};
char str[MAXNETSTR];
if(!str2net(&subnet, value) || !net2str(str, sizeof str, &subnet) || subnet.type == SUBNET_MAC) {
fprintf(stderr, "Could not parse Ifconfig statement\n");
return;
}
#if defined(HAVE_LINUX)
switch(subnet.type) {
case SUBNET_IPV4: fprintf(out, "ip route add %s dev \"$INTERFACE\"\n", str); break;
case SUBNET_IPV6: fprintf(out, "ip route add %s dev \"$INTERFACE\"\n", str); break;
}
#elif defined(HAVE_BSD)
// BSD route command is silly and doesn't accept an interface name as a destination.
char gwstr[MAXNETSTR] = "";
switch(subnet.type) {
case SUBNET_IPV4:
if(!ipv4.type) {
fprintf(stderr, "Route requested but no Ifconfig\n");
return;
}
net2str(gwstr, sizeof gwstr, &ipv4);
char *p = strchr(gwstr, '/'); if(p) *p = 0;
fprintf(out, "route add %s %s\n", str, gwstr);
break;
case SUBNET_IPV6:
if(!ipv6.type) {
fprintf(stderr, "Route requested but no Ifconfig\n");
return;
}
net2str(gwstr, sizeof gwstr, &ipv6);
char *p = strchr(gwstr, '/'); if(p) *p = 0;
fprintf(out, "route add -inet6 %s %s\n", str, gwstr);
break;
}
#elif defined(HAVE_MINGW) || defined(HAVE_CYGWIN)
switch(subnet.type) {
case SUBNET_IPV4: fprintf(out, "netsh inetface ipv4 add route %s \"$INTERFACE\"\n", str); break;
case SUBNET_IPV6: fprintf(out, "netsh inetface ipv6 add route %s \"$INTERFACE\"\n", str); break;
}
#endif
}