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passt/conf.c
Stefano Brivio 4129764eca conf: Fix mask calculation from prefix_len in conf_print() 
Reported-by: Paul Holzinger <pholzing@redhat.com>
Fixes: dd09cceaee ("Minor improvements to IPv4 netmask handling")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
2022-11-10 11:18:09 +01:00

1732 lines
45 KiB
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// SPDX-License-Identifier: AGPL-3.0-or-later
/* PASST - Plug A Simple Socket Transport
* for qemu/UNIX domain socket mode
*
* PASTA - Pack A Subtle Tap Abstraction
* for network namespace/tap device mode
*
* conf.c - Configuration settings and option parsing
*
* Copyright (c) 2020-2021 Red Hat GmbH
* Author: Stefano Brivio <sbrivio@redhat.com>
*/
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <string.h>
#include <sched.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <limits.h>
#include <grp.h>
#include <pwd.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <unistd.h>
#include <syslog.h>
#include <time.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include "util.h"
#include "passt.h"
#include "netlink.h"
#include "udp.h"
#include "tcp.h"
#include "pasta.h"
#include "lineread.h"
#include "isolation.h"
#include "log.h"
/**
* get_bound_ports() - Get maps of ports with bound sockets
* @c: Execution context
* @ns: If set, set bitmaps for ports to tap/ns -- to init otherwise
* @proto: Protocol number (IPPROTO_TCP or IPPROTO_UDP)
*/
void get_bound_ports(struct ctx *c, int ns, uint8_t proto)
{
uint8_t *udp_map, *udp_excl, *tcp_map, *tcp_excl;
if (ns) {
udp_map = c->udp.fwd_in.f.map;
udp_excl = c->udp.fwd_out.f.map;
tcp_map = c->tcp.fwd_in.map;
tcp_excl = c->tcp.fwd_out.map;
} else {
udp_map = c->udp.fwd_out.f.map;
udp_excl = c->udp.fwd_in.f.map;
tcp_map = c->tcp.fwd_out.map;
tcp_excl = c->tcp.fwd_in.map;
}
if (proto == IPPROTO_UDP) {
memset(udp_map, 0, PORT_BITMAP_SIZE);
procfs_scan_listen(c, IPPROTO_UDP, V4, ns, udp_map, udp_excl);
procfs_scan_listen(c, IPPROTO_UDP, V6, ns, udp_map, udp_excl);
procfs_scan_listen(c, IPPROTO_TCP, V4, ns, udp_map, udp_excl);
procfs_scan_listen(c, IPPROTO_TCP, V6, ns, udp_map, udp_excl);
} else if (proto == IPPROTO_TCP) {
memset(tcp_map, 0, PORT_BITMAP_SIZE);
procfs_scan_listen(c, IPPROTO_TCP, V4, ns, tcp_map, tcp_excl);
procfs_scan_listen(c, IPPROTO_TCP, V6, ns, tcp_map, tcp_excl);
}
}
/**
* struct get_bound_ports_ns_arg - Arguments for get_bound_ports_ns()
* @c: Execution context
* @proto: Protocol number (IPPROTO_TCP or IPPROTO_UDP)
*/
struct get_bound_ports_ns_arg {
struct ctx *c;
uint8_t proto;
};
/**
* get_bound_ports_ns() - Get maps of ports in namespace with bound sockets
* @arg: See struct get_bound_ports_ns_arg
*
* Return: 0
*/
static int get_bound_ports_ns(void *arg)
{
struct get_bound_ports_ns_arg *a = (struct get_bound_ports_ns_arg *)arg;
struct ctx *c = a->c;
if (!c->pasta_netns_fd || ns_enter(c))
return 0;
get_bound_ports(c, 1, a->proto);
return 0;
}
/**
* next_chunk - Return the next piece of a string delimited by a character
* @s: String to search
* @c: Delimiter character
*
* Returns: If another @c is found in @s, returns a pointer to the
* character *after* the delimiter, if no further @c is in
* @s, return NULL
*/
static char *next_chunk(const char *s, char c)
{
char *sep = strchr(s, c);
return sep ? sep + 1 : NULL;
}
/**
* port_range - Represents a non-empty range of ports
* @first: First port number in the range
* @last: Last port number in the range (inclusive)
*
* Invariant: @last >= @first
*/
struct port_range {
in_port_t first, last;
};
/**
* parse_port_range() - Parse a range of port numbers '<first>[-<last>]'
* @s: String to parse
* @endptr: Update to the character after the parsed range (similar to
* strtol() etc.)
* @range: Update with the parsed values on success
*
* Return: -EINVAL on parsing error, -ERANGE on out of range port
* numbers, 0 on success
*/
static int parse_port_range(const char *s, char **endptr,
struct port_range *range)
{
unsigned long first, last;
last = first = strtoul(s, endptr, 10);
if (*endptr == s) /* Parsed nothing */
return -EINVAL;
if (**endptr == '-') { /* we have a last value too */
const char *lasts = *endptr + 1;
last = strtoul(lasts, endptr, 10);
if (*endptr == lasts) /* Parsed nothing */
return -EINVAL;
}
if ((last < first) || (last >= NUM_PORTS))
return -ERANGE;
range->first = first;
range->last = last;
return 0;
}
/**
* conf_ports() - Parse port configuration options, initialise UDP/TCP sockets
* @c: Execution context
* @optname: Short option name, t, T, u, or U
* @optarg: Option argument (port specification)
* @fwd: Pointer to @port_fwd to be updated
*
* Return: -EINVAL on parsing error, 0 otherwise
*/
static int conf_ports(const struct ctx *c, char optname, const char *optarg,
struct port_fwd *fwd)
{
char addr_buf[sizeof(struct in6_addr)] = { 0 }, *addr = addr_buf;
char buf[BUFSIZ], *spec, *ifname = NULL, *p;
uint8_t exclude[PORT_BITMAP_SIZE] = { 0 };
sa_family_t af = AF_UNSPEC;
bool exclude_only = true;
if (!strcmp(optarg, "none")) {
if (fwd->mode)
return -EINVAL;
fwd->mode = FWD_NONE;
return 0;
}
if (!strcmp(optarg, "auto")) {
if (fwd->mode || c->mode != MODE_PASTA)
return -EINVAL;
fwd->mode = FWD_AUTO;
return 0;
}
if (!strcmp(optarg, "all")) {
unsigned i;
if (fwd->mode || c->mode != MODE_PASST)
return -EINVAL;
fwd->mode = FWD_ALL;
memset(fwd->map, 0xff, PORT_EPHEMERAL_MIN / 8);
for (i = 0; i < PORT_EPHEMERAL_MIN; i++) {
if (optname == 't')
tcp_sock_init(c, 0, AF_UNSPEC, NULL, NULL, i);
else if (optname == 'u')
udp_sock_init(c, 0, AF_UNSPEC, NULL, NULL, i);
}
return 0;
}
if (fwd->mode > FWD_SPEC)
return -EINVAL;
fwd->mode = FWD_SPEC;
strncpy(buf, optarg, sizeof(buf) - 1);
if ((spec = strchr(buf, '/'))) {
*spec = 0;
spec++;
if (optname != 't' && optname != 'u')
goto bad;
if ((ifname = strchr(buf, '%'))) {
if (spec - ifname >= IFNAMSIZ - 1)
goto bad;
*ifname = 0;
ifname++;
}
if (inet_pton(AF_INET, buf, addr))
af = AF_INET;
else if (inet_pton(AF_INET6, buf, addr))
af = AF_INET6;
else
goto bad;
} else {
spec = buf;
addr = NULL;
}
/* Mark all exclusions first, they might be given after base ranges */
p = spec;
do {
struct port_range xrange;
unsigned i;
if (*p != '~') {
/* Not an exclude range, parse later */
exclude_only = false;
continue;
}
p++;
if (parse_port_range(p, &p, &xrange))
goto bad;
if ((*p != '\0') && (*p != ',')) /* Garbage after the range */
goto bad;
for (i = xrange.first; i <= xrange.last; i++) {
if (bitmap_isset(exclude, i))
goto overlap;
bitmap_set(exclude, i);
}
} while ((p = next_chunk(p, ',')));
if (exclude_only) {
unsigned i;
for (i = 0; i < PORT_EPHEMERAL_MIN; i++) {
if (bitmap_isset(exclude, i))
continue;
bitmap_set(fwd->map, i);
if (optname == 't')
tcp_sock_init(c, 0, af, addr, ifname, i);
else if (optname == 'u')
udp_sock_init(c, 0, af, addr, ifname, i);
}
return 0;
}
/* Now process base ranges, skipping exclusions */
p = spec;
do {
struct port_range orig_range, mapped_range;
unsigned i;
if (*p == '~')
/* Exclude range, already parsed */
continue;
if (parse_port_range(p, &p, &orig_range))
goto bad;
if (*p == ':') { /* There's a range to map to as well */
if (parse_port_range(p + 1, &p, &mapped_range))
goto bad;
if ((mapped_range.last - mapped_range.first) !=
(orig_range.last - orig_range.first))
goto bad;
} else {
mapped_range = orig_range;
}
if ((*p != '\0') && (*p != ',')) /* Garbage after the ranges */
goto bad;
for (i = orig_range.first; i <= orig_range.last; i++) {
if (bitmap_isset(fwd->map, i))
goto overlap;
if (bitmap_isset(exclude, i))
continue;
bitmap_set(fwd->map, i);
fwd->delta[i] = mapped_range.first - orig_range.first;
if (optname == 't')
tcp_sock_init(c, 0, af, addr, ifname, i);
else if (optname == 'u')
udp_sock_init(c, 0, af, addr, ifname, i);
}
} while ((p = next_chunk(p, ',')));
return 0;
bad:
err("Invalid port specifier %s", optarg);
return -EINVAL;
overlap:
err("Overlapping port specifier %s", optarg);
return -EINVAL;
}
/**
* get_dns() - Get nameserver addresses from local /etc/resolv.conf
* @c: Execution context
*/
static void get_dns(struct ctx *c)
{
struct in6_addr *dns6_send = &c->ip6.dns_send[0];
struct in_addr *dns4_send = &c->ip4.dns_send[0];
int dns4_set, dns6_set, dnss_set, dns_set, fd;
struct in6_addr *dns6 = &c->ip6.dns[0];
struct in_addr *dns4 = &c->ip4.dns[0];
struct fqdn *s = c->dns_search;
struct lineread resolvconf;
int line_len;
char *line, *p, *end;
dns4_set = !c->ifi4 || !IN4_IS_ADDR_UNSPECIFIED(dns4);
dns6_set = !c->ifi6 || !IN6_IS_ADDR_UNSPECIFIED(dns6);
dnss_set = !!*s->n || c->no_dns_search;
dns_set = (dns4_set && dns6_set) || c->no_dns;
if (dns_set && dnss_set)
return;
if ((fd = open("/etc/resolv.conf", O_RDONLY | O_CLOEXEC)) < 0)
goto out;
lineread_init(&resolvconf, fd);
while ((line_len = lineread_get(&resolvconf, &line)) > 0) {
if (!dns_set && strstr(line, "nameserver ") == line) {
p = strrchr(line, ' ');
if (!p)
continue;
end = strpbrk(line, "%\n");
if (end)
*end = 0;
if (!dns4_set &&
dns4 - &c->ip4.dns[0] < ARRAY_SIZE(c->ip4.dns) - 1 &&
inet_pton(AF_INET, p + 1, dns4)) {
/* Guest or container can only access local
* addresses via local redirect
*/
if (IN4_IS_ADDR_LOOPBACK(dns4)) {
if (!c->no_map_gw) {
*dns4_send = c->ip4.gw;
dns4_send++;
}
} else {
*dns4_send = *dns4;
dns4_send++;
}
dns4++;
dns4->s_addr = htonl(INADDR_ANY);
dns4_send->s_addr = htonl(INADDR_ANY);
}
if (!dns6_set &&
dns6 - &c->ip6.dns[0] < ARRAY_SIZE(c->ip6.dns) - 1 &&
inet_pton(AF_INET6, p + 1, dns6)) {
/* Guest or container can only access local
* addresses via local redirect
*/
if (IN6_IS_ADDR_LOOPBACK(dns6)) {
if (!c->no_map_gw) {
memcpy(dns6_send, &c->ip6.gw,
sizeof(*dns6_send));
dns6_send++;
}
} else {
memcpy(dns6_send, dns6,
sizeof(*dns6_send));
dns6_send++;
}
dns6++;
memset(dns6, 0, sizeof(*dns6));
memset(dns6_send, 0, sizeof(*dns6_send));
}
} else if (!dnss_set && strstr(line, "search ") == line &&
s == c->dns_search) {
end = strpbrk(line, "\n");
if (end)
*end = 0;
/* cppcheck-suppress strtokCalled */
if (!strtok(line, " \t"))
continue;
while (s - c->dns_search < ARRAY_SIZE(c->dns_search) - 1
/* cppcheck-suppress strtokCalled */
&& (p = strtok(NULL, " \t"))) {
strncpy(s->n, p, sizeof(c->dns_search[0]));
s++;
*s->n = 0;
}
}
}
if (line_len < 0)
warn("Error reading /etc/resolv.conf: %s", strerror(errno));
close(fd);
out:
if (!dns_set && dns4 == c->ip4.dns && dns6 == c->ip6.dns)
warn("Couldn't get any nameserver address");
}
/**
* conf_netns_opt() - Parse --netns option
* @netns: buffer of size PATH_MAX, updated with netns path
* @arg: --netns argument
*
* Return: 0 on success, negative error code otherwise
*/
static int conf_netns_opt(char *netns, const char *arg)
{
int ret;
if (!strchr(arg, '/')) {
/* looks like a netns name */
ret = snprintf(netns, PATH_MAX, "%s/%s", NETNS_RUN_DIR, arg);
} else {
/* otherwise assume it's a netns path */
ret = snprintf(netns, PATH_MAX, "%s", arg);
}
if (ret <= 0 || ret > PATH_MAX) {
err("Network namespace name/path %s too long");
return -E2BIG;
}
return 0;
}
/**
* conf_pasta_ns() - Validate all pasta namespace options
* @netns_only: Don't use userns, may be updated
* @userns: buffer of size PATH_MAX, initially contains --userns
* argument (may be empty), updated with userns path
* @netns: buffer of size PATH_MAX, initial contains --netns
* argument (may be empty), updated with netns path
* @optind: Index of first non-option argument
* @argc: Number of arguments
* @argv: Command line arguments
*
* Return: 0 on success, negative error code otherwise
*/
static int conf_pasta_ns(int *netns_only, char *userns, char *netns,
int optind, int argc, char *argv[])
{
if (*netns_only && *userns) {
err("Both --userns and --netns-only given");
return -EINVAL;
}
if (*netns && optind != argc) {
err("Both --netns and PID or command given");
return -EINVAL;
}
if (optind + 1 == argc) {
char *endptr;
long pidval;
pidval = strtol(argv[optind], &endptr, 10);
if (!*endptr) {
/* Looks like a pid */
if (pidval < 0 || pidval > INT_MAX) {
err("Invalid PID %s", argv[optind]);
return -EINVAL;
}
snprintf(netns, PATH_MAX, "/proc/%ld/ns/net", pidval);
if (!*userns)
snprintf(userns, PATH_MAX, "/proc/%ld/ns/user",
pidval);
}
}
/* Attaching to a netns/PID, with no userns given */
if (*netns && !*userns)
*netns_only = 1;
return 0;
}
/** conf_ip4_prefix() - Parse an IPv4 prefix length or netmask
* @arg: Netmask in dotted decimal or prefix length
*
* Return: Validated prefix length on success, -1 on failure
*/
static int conf_ip4_prefix(const char *arg)
{
struct in_addr mask;
unsigned long len;
if (inet_pton(AF_INET, arg, &mask)) {
in_addr_t hmask = ntohl(mask.s_addr);
len = __builtin_popcount(hmask);
if ((hmask << len) != 0)
return -1;
} else {
errno = 0;
len = strtoul(optarg, NULL, 0);
if (len > 32 || errno)
return -1;
}
return len;
}
/**
* conf_ip4() - Verify or detect IPv4 support, get relevant addresses
* @ifi: Host interface to attempt (0 to determine one)
* @ip4: IPv4 context (will be written)
* @mac: MAC address to use (written if unset)
*
* Return: Interface index for IPv4, or 0 on failure.
*/
static unsigned int conf_ip4(unsigned int ifi,
struct ip4_ctx *ip4, unsigned char *mac)
{
in_addr_t addr, gw;
int shift;
if (!ifi)
ifi = nl_get_ext_if(AF_INET);
if (!ifi) {
warn("No external routable interface for IPv4");
return 0;
}
if (IN4_IS_ADDR_UNSPECIFIED(&ip4->gw))
nl_route(0, ifi, AF_INET, &ip4->gw);
if (IN4_IS_ADDR_UNSPECIFIED(&ip4->addr))
nl_addr(0, ifi, AF_INET, &ip4->addr, &ip4->prefix_len, NULL);
addr = ntohl(ip4->addr.s_addr);
gw = ntohl(ip4->gw.s_addr);
if (!ip4->prefix_len) {
if (IN_CLASSA(addr))
ip4->prefix_len = (32 - IN_CLASSA_NSHIFT);
else if (IN_CLASSB(addr))
ip4->prefix_len = (32 - IN_CLASSB_NSHIFT);
else if (IN_CLASSC(addr))
ip4->prefix_len = (32 - IN_CLASSC_NSHIFT);
else
ip4->prefix_len = 32;
}
/* We might get an address with a netmask that makes the default
* gateway unreachable, and in that case we would fail to configure
* the default route, with --config-net, or presumably a DHCP client
* in the guest or container would face the same issue.
*
* The host might have another route, to the default gateway itself,
* fixing the situation, but we only read default routes.
*
* Fix up the mask to allow reaching the default gateway from our
* configured address, if needed, and only if we find a non-zero
* mask that makes the gateway reachable.
*/
shift = 32 - ip4->prefix_len;
while (shift < 32 && addr >> shift != gw >> shift)
shift++;
if (shift < 32)
ip4->prefix_len = 32 - shift;
memcpy(&ip4->addr_seen, &ip4->addr, sizeof(ip4->addr_seen));
if (MAC_IS_ZERO(mac))
nl_link(0, ifi, mac, 0, 0);
if (IN4_IS_ADDR_UNSPECIFIED(&ip4->gw) ||
IN4_IS_ADDR_UNSPECIFIED(&ip4->addr) ||
MAC_IS_ZERO(mac))
return 0;
return ifi;
}
/**
* conf_ip6() - Verify or detect IPv6 support, get relevant addresses
* @ifi: Host interface to attempt (0 to determine one)
* @ip6: IPv6 context (will be written)
* @mac: MAC address to use (written if unset)
*
* Return: Interface index for IPv6, or 0 on failure.
*/
static unsigned int conf_ip6(unsigned int ifi,
struct ip6_ctx *ip6, unsigned char *mac)
{
int prefix_len = 0;
if (!ifi)
ifi = nl_get_ext_if(AF_INET6);
if (!ifi) {
warn("No external routable interface for IPv6");
return 0;
}
if (IN6_IS_ADDR_UNSPECIFIED(&ip6->gw))
nl_route(0, ifi, AF_INET6, &ip6->gw);
nl_addr(0, ifi, AF_INET6,
IN6_IS_ADDR_UNSPECIFIED(&ip6->addr) ? &ip6->addr : NULL,
&prefix_len, &ip6->addr_ll);
memcpy(&ip6->addr_seen, &ip6->addr, sizeof(ip6->addr));
memcpy(&ip6->addr_ll_seen, &ip6->addr_ll, sizeof(ip6->addr_ll));
if (MAC_IS_ZERO(mac))
nl_link(0, ifi, mac, 0, 0);
if (IN6_IS_ADDR_UNSPECIFIED(&ip6->gw) ||
IN6_IS_ADDR_UNSPECIFIED(&ip6->addr) ||
IN6_IS_ADDR_UNSPECIFIED(&ip6->addr_ll) ||
MAC_IS_ZERO(mac))
return 0;
return ifi;
}
/**
* usage() - Print usage and exit
* @name: Executable name
*/
static void usage(const char *name)
{
if (strstr(name, "pasta")) {
info("Usage: %s [OPTION]... [COMMAND] [ARGS]...", name);
info(" %s [OPTION]... PID", name);
info(" %s [OPTION]... --netns [PATH|NAME]", name);
info("");
info("Without PID or --netns, run the given command or a");
info("default shell in a new network and user namespace, and");
info("connect it via pasta.");
} else {
info("Usage: %s [OPTION]...", name);
}
info("");
info( " -d, --debug Be verbose");
info( " --trace Be extra verbose, implies --debug");
info( " -q, --quiet Don't print informational messages");
info( " -f, --foreground Don't run in background");
info( " default: run in background if started from a TTY");
info( " -e, --stderr Log to stderr too");
info( " default: log to system logger only if started from a TTY");
info( " -l, --log-file PATH Log (only) to given file");
info( " --log-size BYTES Maximum size of log file");
info( " default: 1 MiB");
info( " --runas UID|UID:GID Run as given UID, GID, which can be");
info( " numeric, or login and group names");
info( " default: drop to user \"nobody\"");
info( " -h, --help Display this help message and exit");
info( " --version Show version and exit");
if (strstr(name, "pasta")) {
info( " -I, --ns-ifname NAME namespace interface name");
info( " default: same interface name as external one");
} else {
info( " -s, --socket PATH UNIX domain socket path");
info( " default: probe free path starting from "
UNIX_SOCK_PATH, 1);
}
info( " -p, --pcap FILE Log tap-facing traffic to pcap file");
info( " -P, --pid FILE Write own PID to the given file");
info( " -m, --mtu MTU Assign MTU via DHCP/NDP");
info( " a zero value disables assignment");
info( " default: 65520: maximum 802.3 MTU minus 802.3 header");
info( " length, rounded to 32 bits (IPv4 words)");
info( " -a, --address ADDR Assign IPv4 or IPv6 address ADDR");
info( " can be specified zero to two times (for IPv4 and IPv6)");
info( " default: use addresses from interface with default route");
info( " -n, --netmask MASK Assign IPv4 MASK, dot-decimal or bits");
info( " default: netmask from matching address on the host");
info( " -M, --mac-addr ADDR Use source MAC address ADDR");
info( " default: MAC address from interface with default route");
info( " -g, --gateway ADDR Pass IPv4 or IPv6 address as gateway");
info( " default: gateway from interface with default route");
info( " -i, --interface NAME Interface for addresses and routes");
info( " default: interface with first default route");
info( " -D, --dns ADDR Use IPv4 or IPv6 address as DNS");
info( " can be specified multiple times");
info( " a single, empty option disables DNS information");
if (strstr(name, "pasta"))
info( " default: don't use any addresses");
else
info( " default: use addresses from /etc/resolv.conf");
info( " -S, --search LIST Space-separated list, search domains");
info( " a single, empty option disables the DNS search list");
if (strstr(name, "pasta"))
info( " default: don't use any search list");
else
info( " default: use search list from /etc/resolv.conf");
if (strstr(name, "pasta"))
info(" --dhcp-dns \tPass DNS list via DHCP/DHCPv6/NDP");
else
info(" --no-dhcp-dns No DNS list in DHCP/DHCPv6/NDP");
if (strstr(name, "pasta"))
info(" --dhcp-search Pass list via DHCP/DHCPv6/NDP");
else
info(" --no-dhcp-search No list in DHCP/DHCPv6/NDP");
info( " --dns-forward ADDR Forward DNS queries sent to ADDR");
info( " can be specified zero to two times (for IPv4 and IPv6)");
info( " default: don't forward DNS queries");
info( " --no-tcp Disable TCP protocol handler");
info( " --no-udp Disable UDP protocol handler");
info( " --no-icmp Disable ICMP/ICMPv6 protocol handler");
info( " --no-dhcp Disable DHCP server");
info( " --no-ndp Disable NDP responses");
info( " --no-dhcpv6 Disable DHCPv6 server");
info( " --no-ra Disable router advertisements");
info( " --no-map-gw Don't map gateway address to host");
info( " -4, --ipv4-only Enable IPv4 operation only");
info( " -6, --ipv6-only Enable IPv6 operation only");
if (strstr(name, "pasta"))
goto pasta_opts;
info( " -1, --one-off Quit after handling one single client");
info( " -t, --tcp-ports SPEC TCP port forwarding to guest");
info( " can be specified multiple times");
info( " SPEC can be:");
info( " 'none': don't forward any ports");
info( " 'all': forward all unbound, non-ephemeral ports");
info( " a comma-separated list, optionally ranged with '-'");
info( " and optional target ports after ':', with optional");
info( " address specification suffixed by '/' and optional");
info( " interface prefixed by '%%'. Ranges can be reduced by");
info( " excluding ports or ranges prefixed by '~'");
info( " Examples:");
info( " -t 22 Forward local port 22 to 22 on guest");
info( " -t 22:23 Forward local port 22 to 23 on guest");
info( " -t 22,25 Forward ports 22, 25 to ports 22, 25");
info( " -t 22-80 Forward ports 22 to 80");
info( " -t 22-80:32-90 Forward ports 22 to 80 to");
info( " corresponding port numbers plus 10");
info( " -t 192.0.2.1/5 Bind port 5 of 192.0.2.1 to guest");
info( " -t 5-25,~10-20 Forward ports 5 to 9, and 21 to 25");
info( " -t ~25 Forward all ports except for 25");
info( " default: none");
info( " -u, --udp-ports SPEC UDP port forwarding to guest");
info( " SPEC is as described for TCP above");
info( " default: none");
exit(EXIT_FAILURE);
pasta_opts:
info( " -t, --tcp-ports SPEC TCP port forwarding to namespace");
info( " can be specified multiple times");
info( " SPEC can be:");
info( " 'none': don't forward any ports");
info( " 'auto': forward all ports currently bound in namespace");
info( " a comma-separated list, optionally ranged with '-'");
info( " and optional target ports after ':', with optional");
info( " address specification suffixed by '/' and optional");
info( " interface prefixed by '%%'. Examples:");
info( " -t 22 Forward local port 22 to port 22 in netns");
info( " -t 22:23 Forward local port 22 to port 23");
info( " -t 22,25 Forward ports 22, 25 to ports 22, 25");
info( " -t 22-80 Forward ports 22 to 80");
info( " -t 22-80:32-90 Forward ports 22 to 80 to");
info( " corresponding port numbers plus 10");
info( " -t 192.0.2.1/5 Bind port 5 of 192.0.2.1 to namespace");
info( " -t 5-25,~10-20 Forward ports 5 to 9, and 21 to 25");
info( " -t ~25 Forward all bound ports except for 25");
info( " default: auto");
info( " IPv6 bound ports are also forwarded for IPv4");
info( " -u, --udp-ports SPEC UDP port forwarding to namespace");
info( " SPEC is as described for TCP above");
info( " default: auto");
info( " IPv6 bound ports are also forwarded for IPv4");
info( " unless specified, with '-t auto', UDP ports with numbers");
info( " corresponding to forwarded TCP port numbers are");
info( " forwarded too");
info( " -T, --tcp-ns SPEC TCP port forwarding to init namespace");
info( " SPEC is as described above");
info( " default: auto");
info( " -U, --udp-ns SPEC UDP port forwarding to init namespace");
info( " SPEC is as described above");
info( " default: auto");
info( " --userns NSPATH Target user namespace to join");
info( " --netns PATH|NAME Target network namespace to join");
info( " --netns-only Don't join existing user namespace");
info( " implied if PATH or NAME are given without --userns");
info( " --no-netns-quit Don't quit if filesystem-bound target");
info( " network namespace is deleted");
info( " --config-net Configure tap interface in namespace");
info( " --ns-mac-addr ADDR Set MAC address on tap interface");
exit(EXIT_FAILURE);
}
/**
* conf_print() - Print fundamental configuration parameters
* @c: Execution context
*/
static void conf_print(const struct ctx *c)
{
char buf4[INET_ADDRSTRLEN], ifn[IFNAMSIZ];
int i;
if (c->ifi4)
info("Outbound interface (IPv4): %s", if_indextoname(c->ifi4, ifn));
if (c->ifi6)
info("Outbound interface (IPv6): %s", if_indextoname(c->ifi6, ifn));
if (c->mode == MODE_PASTA)
info("Namespace interface: %s", c->pasta_ifn);
info("MAC:");
info(" host: %02x:%02x:%02x:%02x:%02x:%02x",
c->mac[0], c->mac[1], c->mac[2],
c->mac[3], c->mac[4], c->mac[5]);
if (c->ifi4) {
if (!c->no_dhcp) {
uint32_t mask;
mask = htonl(0xffffffff << (32 - c->ip4.prefix_len));
info("DHCP:");
info(" assign: %s",
inet_ntop(AF_INET, &c->ip4.addr, buf4, sizeof(buf4)));
info(" mask: %s",
inet_ntop(AF_INET, &mask, buf4, sizeof(buf4)));
info(" router: %s",
inet_ntop(AF_INET, &c->ip4.gw, buf4, sizeof(buf4)));
}
for (i = 0; !IN4_IS_ADDR_UNSPECIFIED(&c->ip4.dns_send[i]);
i++) {
if (!i)
info("DNS:");
inet_ntop(AF_INET, &c->ip4.dns_send[i], buf4,
sizeof(buf4));
info(" %s", buf4);
}
for (i = 0; *c->dns_search[i].n; i++) {
if (!i)
info("DNS search list:");
info(" %s", c->dns_search[i].n);
}
}
if (c->ifi6) {
char buf6[INET6_ADDRSTRLEN];
if (!c->no_ndp && !c->no_dhcpv6)
info("NDP/DHCPv6:");
else if (!c->no_ndp)
info("DHCPv6:");
else if (!c->no_dhcpv6)
info("NDP:");
else
goto dns6;
info(" assign: %s",
inet_ntop(AF_INET6, &c->ip6.addr, buf6, sizeof(buf6)));
info(" router: %s",
inet_ntop(AF_INET6, &c->ip6.gw, buf6, sizeof(buf6)));
info(" our link-local: %s",
inet_ntop(AF_INET6, &c->ip6.addr_ll, buf6, sizeof(buf6)));
dns6:
for (i = 0; !IN6_IS_ADDR_UNSPECIFIED(&c->ip6.dns_send[i]);
i++) {
if (!i)
info("DNS:");
inet_ntop(AF_INET6, &c->ip6.dns[i], buf6, sizeof(buf6));
info(" %s", buf6);
}
for (i = 0; *c->dns_search[i].n; i++) {
if (!i)
info("DNS search list:");
info(" %s", c->dns_search[i].n);
}
}
}
/**
* conf_runas() - Handle --runas: look up desired UID and GID
* @opt: Passed option value
* @uid: User ID, set on return if valid
* @gid: Group ID, set on return if valid
*
* Return: 0 on success, negative error code on failure
*/
static int conf_runas(char *opt, unsigned int *uid, unsigned int *gid)
{
const char *uopt, *gopt = NULL;
char *sep = strchr(opt, ':');
char *endptr;
if (sep) {
*sep = '\0';
gopt = sep + 1;
}
uopt = opt;
*gid = *uid = strtol(uopt, &endptr, 0);
if (*endptr) {
#ifndef GLIBC_NO_STATIC_NSS
/* Not numeric, look up as a username */
struct passwd *pw;
/* cppcheck-suppress getpwnamCalled */
if (!(pw = getpwnam(uopt)) || !(*uid = pw->pw_uid))
return -ENOENT;
*gid = pw->pw_gid;
#else
return -EINVAL;
#endif
}
if (!gopt)
return 0;
*gid = strtol(gopt, &endptr, 0);
if (*endptr) {
#ifndef GLIBC_NO_STATIC_NSS
/* Not numeric, look up as a group name */
struct group *gr;
/* cppcheck-suppress getgrnamCalled */
if (!(gr = getgrnam(gopt)))
return -ENOENT;
*gid = gr->gr_gid;
#else
return -EINVAL;
#endif
}
return 0;
}
/**
* conf_ugid() - Determine UID and GID to run as
* @runas: --runas option, may be NULL
* @uid: User ID, set on success
* @gid: Group ID, set on success
*
* Return: 0 on success, negative error code on failure
*/
static int conf_ugid(char *runas, uid_t *uid, gid_t *gid)
{
const char root_uid_map[] = " 0 0 4294967295";
char buf[BUFSIZ];
int ret;
int fd;
/* If user has specified --runas, that takes precedence... */
if (runas) {
ret = conf_runas(runas, uid, gid);
if (ret)
err("Invalid --runas option: %s", runas);
return ret;
}
/* ...otherwise default to current user and group... */
*uid = geteuid();
*gid = getegid();
/* ...as long as it's not root... */
if (*uid)
return 0;
/* ...or at least not root in the init namespace... */
if ((fd = open("/proc/self/uid_map", O_RDONLY | O_CLOEXEC)) < 0) {
ret = -errno;
err("Can't determine if we're in init namespace: %s",
strerror(-ret));
return ret;
}
if (read(fd, buf, BUFSIZ) != sizeof(root_uid_map) ||
strncmp(buf, root_uid_map, sizeof(root_uid_map) - 1)) {
close(fd);
return 0;
}
close(fd);
/* ...otherwise use nobody:nobody */
warn("Don't run as root. Changing to nobody...");
{
#ifndef GLIBC_NO_STATIC_NSS
struct passwd *pw;
/* cppcheck-suppress getpwnamCalled */
pw = getpwnam("nobody");
if (!pw) {
perror("getpwnam");
exit(EXIT_FAILURE);
}
*uid = pw->pw_uid;
*gid = pw->pw_gid;
#else
/* Common value for 'nobody', not really specified */
*uid = *gid = 65534;
#endif
}
return 0;
}
/**
* conf() - Process command-line arguments and set configuration
* @c: Execution context
* @argc: Argument count
* @argv: Options, plus target PID for pasta mode
*/
void conf(struct ctx *c, int argc, char **argv)
{
int netns_only = 0;
struct option options[] = {
{"debug", no_argument, NULL, 'd' },
{"quiet", no_argument, NULL, 'q' },
{"foreground", no_argument, NULL, 'f' },
{"stderr", no_argument, NULL, 'e' },
{"log-file", required_argument, NULL, 'l' },
{"help", no_argument, NULL, 'h' },
{"socket", required_argument, NULL, 's' },
{"ns-ifname", required_argument, NULL, 'I' },
{"pcap", required_argument, NULL, 'p' },
{"pid", required_argument, NULL, 'P' },
{"mtu", required_argument, NULL, 'm' },
{"address", required_argument, NULL, 'a' },
{"netmask", required_argument, NULL, 'n' },
{"mac-addr", required_argument, NULL, 'M' },
{"gateway", required_argument, NULL, 'g' },
{"interface", required_argument, NULL, 'i' },
{"dns", required_argument, NULL, 'D' },
{"search", required_argument, NULL, 'S' },
{"no-tcp", no_argument, &c->no_tcp, 1 },
{"no-udp", no_argument, &c->no_udp, 1 },
{"no-icmp", no_argument, &c->no_icmp, 1 },
{"no-dhcp", no_argument, &c->no_dhcp, 1 },
{"no-dhcpv6", no_argument, &c->no_dhcpv6, 1 },
{"no-ndp", no_argument, &c->no_ndp, 1 },
{"no-ra", no_argument, &c->no_ra, 1 },
{"no-map-gw", no_argument, &c->no_map_gw, 1 },
{"ipv4-only", no_argument, NULL, '4' },
{"ipv6-only", no_argument, NULL, '6' },
{"one-off", no_argument, NULL, '1' },
{"tcp-ports", required_argument, NULL, 't' },
{"udp-ports", required_argument, NULL, 'u' },
{"tcp-ns", required_argument, NULL, 'T' },
{"udp-ns", required_argument, NULL, 'U' },
{"userns", required_argument, NULL, 2 },
{"netns", required_argument, NULL, 3 },
{"netns-only", no_argument, &netns_only, 1 },
{"config-net", no_argument, &c->pasta_conf_ns, 1 },
{"ns-mac-addr", required_argument, NULL, 4 },
{"dhcp-dns", no_argument, NULL, 5 },
{"no-dhcp-dns", no_argument, NULL, 6 },
{"dhcp-search", no_argument, NULL, 7 },
{"no-dhcp-search", no_argument, NULL, 8 },
{"dns-forward", required_argument, NULL, 9 },
{"no-netns-quit", no_argument, NULL, 10 },
{"trace", no_argument, NULL, 11 },
{"runas", required_argument, NULL, 12 },
{"log-size", required_argument, NULL, 13 },
{"version", no_argument, NULL, 14 },
{ 0 },
};
struct get_bound_ports_ns_arg ns_ports_arg = { .c = c };
char userns[PATH_MAX] = { 0 }, netns[PATH_MAX] = { 0 };
bool v4_only = false, v6_only = false;
char *runas = NULL, *logfile = NULL;
struct in6_addr *dns6 = c->ip6.dns;
struct fqdn *dnss = c->dns_search;
struct in_addr *dns4 = c->ip4.dns;
const char *optstring;
unsigned int ifi = 0;
int name, ret, b, i;
size_t logsize = 0;
uid_t uid;
gid_t gid;
if (c->mode == MODE_PASTA) {
c->no_dhcp_dns = c->no_dhcp_dns_search = 1;
optstring = "dqfel:hI:p:P:m:a:n:M:g:i:D:S:46t:u:T:U:";
} else {
optstring = "dqfel:hs:p:P:m:a:n:M:g:i:D:S:461t:u:";
}
c->tcp.fwd_in.mode = c->tcp.fwd_out.mode = 0;
c->udp.fwd_in.f.mode = c->udp.fwd_out.f.mode = 0;
do {
name = getopt_long(argc, argv, optstring, options, NULL);
switch (name) {
case -1:
case 0:
break;
case 2:
if (c->mode != MODE_PASTA) {
err("--userns is for pasta mode only");
usage(argv[0]);
}
ret = snprintf(userns, sizeof(userns), "%s", optarg);
if (ret <= 0 || ret >= (int)sizeof(userns)) {
err("Invalid userns: %s", optarg);
usage(argv[0]);
}
break;
case 3:
if (c->mode != MODE_PASTA) {
err("--netns is for pasta mode only");
usage(argv[0]);
}
ret = conf_netns_opt(netns, optarg);
if (ret < 0)
usage(argv[0]);
break;
case 4:
if (c->mode != MODE_PASTA) {
err("--ns-mac-addr is for pasta mode only");
usage(argv[0]);
}
for (i = 0; i < ETH_ALEN; i++) {
errno = 0;
b = strtol(optarg + (intptr_t)i * 3, NULL, 16);
if (b < 0 || b > UCHAR_MAX || errno) {
err("Invalid MAC address: %s", optarg);
usage(argv[0]);
}
c->mac_guest[i] = b;
}
break;
case 5:
if (c->mode != MODE_PASTA) {
err("--dhcp-dns is for pasta mode only");
usage(argv[0]);
}
c->no_dhcp_dns = 0;
break;
case 6:
if (c->mode != MODE_PASST) {
err("--no-dhcp-dns is for passt mode only");
usage(argv[0]);
}
c->no_dhcp_dns = 1;
break;
case 7:
if (c->mode != MODE_PASTA) {
err("--dhcp-search is for pasta mode only");
usage(argv[0]);
}
c->no_dhcp_dns_search = 0;
break;
case 8:
if (c->mode != MODE_PASST) {
err("--no-dhcp-search is for passt mode only");
usage(argv[0]);
}
c->no_dhcp_dns_search = 1;
break;
case 9:
if (IN6_IS_ADDR_UNSPECIFIED(&c->ip6.dns_fwd) &&
inet_pton(AF_INET6, optarg, &c->ip6.dns_fwd) &&
!IN6_IS_ADDR_UNSPECIFIED(&c->ip6.dns_fwd) &&
!IN6_IS_ADDR_LOOPBACK(&c->ip6.dns_fwd))
break;
if (IN4_IS_ADDR_UNSPECIFIED(&c->ip4.dns_fwd) &&
inet_pton(AF_INET, optarg, &c->ip4.dns_fwd) &&
!IN4_IS_ADDR_UNSPECIFIED(&c->ip4.dns_fwd) &&
!IN4_IS_ADDR_BROADCAST(&c->ip4.dns_fwd) &&
!IN4_IS_ADDR_LOOPBACK(&c->ip4.dns_fwd))
break;
err("Invalid DNS forwarding address: %s", optarg);
usage(argv[0]);
break;
case 10:
if (c->mode != MODE_PASTA) {
err("--no-netns-quit is for pasta mode only");
usage(argv[0]);
}
c->no_netns_quit = 1;
break;
case 11:
if (c->trace) {
err("Multiple --trace options given");
usage(argv[0]);
}
if (c->quiet) {
err("Either --trace or --quiet");
usage(argv[0]);
}
c->trace = c->debug = 1;
break;
case 12:
if (runas) {
err("Multiple --runas options given");
usage(argv[0]);
}
runas = optarg;
break;
case 13:
if (logsize) {
err("Multiple --log-size options given");
usage(argv[0]);
}
errno = 0;
logsize = strtol(optarg, NULL, 0);
if (logsize < LOGFILE_SIZE_MIN || errno) {
err("Invalid --log-size: %s", optarg);
usage(argv[0]);
}
break;
case 14:
fprintf(stdout,
c->mode == MODE_PASST ? "passt " : "pasta ");
fprintf(stdout, VERSION_BLOB);
exit(EXIT_SUCCESS);
case 'd':
if (c->debug) {
err("Multiple --debug options given");
usage(argv[0]);
}
if (c->quiet) {
err("Either --debug or --quiet");
usage(argv[0]);
}
c->debug = 1;
break;
case 'e':
if (logfile) {
err("Can't log to both file and stderr");
usage(argv[0]);
}
if (c->stderr) {
err("Multiple --stderr options given");
usage(argv[0]);
}
c->stderr = 1;
break;
case 'l':
if (c->stderr) {
err("Can't log to both stderr and file");
usage(argv[0]);
}
if (logfile) {
err("Multiple --log-file options given");
usage(argv[0]);
}
logfile = optarg;
break;
case 'q':
if (c->quiet) {
err("Multiple --quiet options given");
usage(argv[0]);
}
if (c->debug) {
err("Either --debug or --quiet");
usage(argv[0]);
}
c->quiet = 1;
break;
case 'f':
if (c->foreground) {
err("Multiple --foreground options given");
usage(argv[0]);
}
c->foreground = 1;
break;
case 's':
if (*c->sock_path) {
err("Multiple --socket options given");
usage(argv[0]);
}
ret = snprintf(c->sock_path, UNIX_SOCK_MAX - 1, "%s",
optarg);
if (ret <= 0 || ret >= (int)sizeof(c->sock_path)) {
err("Invalid socket path: %s", optarg);
usage(argv[0]);
}
break;
case 'I':
if (*c->pasta_ifn) {
err("Multiple --ns-ifname options given");
usage(argv[0]);
}
ret = snprintf(c->pasta_ifn, IFNAMSIZ - 1, "%s",
optarg);
if (ret <= 0 || ret >= IFNAMSIZ - 1) {
err("Invalid interface name: %s", optarg);
usage(argv[0]);
}
break;
case 'p':
if (*c->pcap) {
err("Multiple --pcap options given");
usage(argv[0]);
}
ret = snprintf(c->pcap, sizeof(c->pcap), "%s", optarg);
if (ret <= 0 || ret >= (int)sizeof(c->pcap)) {
err("Invalid pcap path: %s", optarg);
usage(argv[0]);
}
break;
case 'P':
if (*c->pid_file) {
err("Multiple --pid options given");
usage(argv[0]);
}
ret = snprintf(c->pid_file, sizeof(c->pid_file), "%s",
optarg);
if (ret <= 0 || ret >= (int)sizeof(c->pid_file)) {
err("Invalid PID file: %s", optarg);
usage(argv[0]);
}
break;
case 'm':
if (c->mtu) {
err("Multiple --mtu options given");
usage(argv[0]);
}
errno = 0;
c->mtu = strtol(optarg, NULL, 0);
if (!c->mtu) {
c->mtu = -1;
break;
}
if (c->mtu < ETH_MIN_MTU || c->mtu > (int)ETH_MAX_MTU ||
errno) {
err("Invalid MTU: %s", optarg);
usage(argv[0]);
}
break;
case 'a':
if (IN6_IS_ADDR_UNSPECIFIED(&c->ip6.addr) &&
inet_pton(AF_INET6, optarg, &c->ip6.addr) &&
!IN6_IS_ADDR_UNSPECIFIED(&c->ip6.addr) &&
!IN6_IS_ADDR_LOOPBACK(&c->ip6.addr) &&
!IN6_IS_ADDR_V4MAPPED(&c->ip6.addr) &&
!IN6_IS_ADDR_V4COMPAT(&c->ip6.addr) &&
!IN6_IS_ADDR_MULTICAST(&c->ip6.addr))
break;
if (IN4_IS_ADDR_UNSPECIFIED(&c->ip4.addr) &&
inet_pton(AF_INET, optarg, &c->ip4.addr) &&
!IN4_IS_ADDR_UNSPECIFIED(&c->ip4.addr) &&
!IN4_IS_ADDR_BROADCAST(&c->ip4.addr) &&
!IN4_IS_ADDR_LOOPBACK(&c->ip4.addr) &&
!IN4_IS_ADDR_MULTICAST(&c->ip4.addr))
break;
err("Invalid address: %s", optarg);
usage(argv[0]);
break;
case 'n':
c->ip4.prefix_len = conf_ip4_prefix(optarg);
if (c->ip4.prefix_len < 0) {
err("Invalid netmask: %s", optarg);
usage(argv[0]);
}
break;
case 'M':
for (i = 0; i < ETH_ALEN; i++) {
errno = 0;
b = strtol(optarg + (intptr_t)i * 3, NULL, 16);
if (b < 0 || b > UCHAR_MAX || errno) {
err("Invalid MAC address: %s", optarg);
usage(argv[0]);
}
c->mac[i] = b;
}
break;
case 'g':
if (IN6_IS_ADDR_UNSPECIFIED(&c->ip6.gw) &&
inet_pton(AF_INET6, optarg, &c->ip6.gw) &&
!IN6_IS_ADDR_UNSPECIFIED(&c->ip6.gw) &&
!IN6_IS_ADDR_LOOPBACK(&c->ip6.gw))
break;
if (IN4_IS_ADDR_UNSPECIFIED(&c->ip4.gw) &&
inet_pton(AF_INET, optarg, &c->ip4.gw) &&
!IN4_IS_ADDR_UNSPECIFIED(&c->ip4.gw) &&
!IN4_IS_ADDR_BROADCAST(&c->ip4.gw) &&
!IN4_IS_ADDR_LOOPBACK(&c->ip4.gw))
break;
err("Invalid gateway address: %s", optarg);
usage(argv[0]);
break;
case 'i':
if (ifi) {
err("Redundant interface: %s", optarg);
usage(argv[0]);
}
if (!(ifi = if_nametoindex(optarg))) {
err("Invalid interface name %s: %s", optarg,
strerror(errno));
usage(argv[0]);
}
break;
case 'D':
if (!strcmp(optarg, "none")) {
if (c->no_dns) {
err("Redundant DNS options");
usage(argv[0]);
}
if (dns4 - c->ip4.dns || dns6 - c->ip6.dns) {
err("Conflicting DNS options");
usage(argv[0]);
}
c->no_dns = 1;
break;
}
if (c->no_dns) {
err("Conflicting DNS options");
usage(argv[0]);
}
if (dns4 - &c->ip4.dns[0] < ARRAY_SIZE(c->ip4.dns) &&
inet_pton(AF_INET, optarg, dns4)) {
dns4++;
break;
}
if (dns6 - &c->ip6.dns[0] < ARRAY_SIZE(c->ip6.dns) &&
inet_pton(AF_INET6, optarg, dns6)) {
dns6++;
break;
}
err("Cannot use DNS address %s", optarg);
usage(argv[0]);
break;
case 'S':
if (!strcmp(optarg, "none")) {
if (c->no_dns_search) {
err("Redundant DNS search options");
usage(argv[0]);
}
if (dnss != c->dns_search) {
err("Conflicting DNS search options");
usage(argv[0]);
}
c->no_dns_search = 1;
break;
}
if (c->no_dns_search) {
err("Conflicting DNS search options");
usage(argv[0]);
}
if (dnss - c->dns_search < ARRAY_SIZE(c->dns_search)) {
ret = snprintf(dnss->n, sizeof(*c->dns_search),
"%s", optarg);
dnss++;
if (ret > 0 &&
ret < (int)sizeof(*c->dns_search))
break;
}
err("Cannot use DNS search domain %s", optarg);
usage(argv[0]);
break;
case '4':
v4_only = true;
break;
case '6':
v6_only = true;
break;
case '1':
if (c->mode != MODE_PASST) {
err("--one-off is for passt mode only");
usage(argv[0]);
}
if (c->one_off) {
err("Redundant --one-off option");
usage(argv[0]);
}
c->one_off = true;
break;
case 't':
case 'u':
case 'T':
case 'U':
/* Handle these later, once addresses are configured */
break;
case '?':
case 'h':
default:
usage(argv[0]);
break;
}
} while (name != -1);
if (v4_only && v6_only) {
err("Options ipv4-only and ipv6-only are mutually exclusive");
usage(argv[0]);
}
ret = conf_ugid(runas, &uid, &gid);
if (ret)
usage(argv[0]);
if (logfile) {
logfile_init(c->mode == MODE_PASST ? "passt" : "pasta",
logfile, logsize);
}
nl_sock_init(c, false);
if (!v6_only)
c->ifi4 = conf_ip4(ifi, &c->ip4, c->mac);
if (!v4_only)
c->ifi6 = conf_ip6(ifi, &c->ip6, c->mac);
if (!c->ifi4 && !c->ifi6) {
err("External interface not usable");
exit(EXIT_FAILURE);
}
/* Inbound port options can be parsed now (after IPv4/IPv6 settings) */
optind = 1;
do {
struct port_fwd *fwd;
name = getopt_long(argc, argv, optstring, options, NULL);
if ((name == 't' && (fwd = &c->tcp.fwd_in)) ||
(name == 'u' && (fwd = &c->udp.fwd_in.f))) {
if (!optarg || conf_ports(c, name, optarg, fwd))
usage(argv[0]);
}
} while (name != -1);
if (c->mode == MODE_PASTA) {
if (conf_pasta_ns(&netns_only, userns, netns,
optind, argc, argv) < 0)
usage(argv[0]);
} else if (optind != argc) {
usage(argv[0]);
}
isolate_user(uid, gid, !netns_only, userns, c->mode);
if (c->pasta_conf_ns)
c->no_ra = 1;
if (c->mode == MODE_PASTA) {
if (*netns) {
pasta_open_ns(c, netns);
} else {
pasta_start_ns(c, uid, gid,
argc - optind, argv + optind);
}
}
if (c->mode == MODE_PASTA)
nl_sock_init(c, true);
/* ...and outbound port options now that namespaces are set up. */
optind = 1;
do {
struct port_fwd *fwd;
name = getopt_long(argc, argv, optstring, options, NULL);
if ((name == 'T' && (fwd = &c->tcp.fwd_out)) ||
(name == 'U' && (fwd = &c->udp.fwd_out.f))) {
if (!optarg || conf_ports(c, name, optarg, fwd))
usage(argv[0]);
}
} while (name != -1);
if (!c->ifi4)
c->no_dhcp = 1;
if (!c->ifi6) {
c->no_ndp = 1;
c->no_dhcpv6 = 1;
}
if (!c->mtu)
c->mtu = ROUND_DOWN(ETH_MAX_MTU - ETH_HLEN, sizeof(uint32_t));
get_dns(c);
if (!*c->pasta_ifn) {
if (c->ifi4)
if_indextoname(c->ifi4, c->pasta_ifn);
else
if_indextoname(c->ifi6, c->pasta_ifn);
}
if (c->mode == MODE_PASTA) {
c->proc_net_tcp[V4][0] = c->proc_net_tcp[V4][1] = -1;
c->proc_net_tcp[V6][0] = c->proc_net_tcp[V6][1] = -1;
c->proc_net_udp[V4][0] = c->proc_net_udp[V4][1] = -1;
c->proc_net_udp[V6][0] = c->proc_net_udp[V6][1] = -1;
if (!c->tcp.fwd_in.mode || c->tcp.fwd_in.mode == FWD_AUTO) {
c->tcp.fwd_in.mode = FWD_AUTO;
ns_ports_arg.proto = IPPROTO_TCP;
NS_CALL(get_bound_ports_ns, &ns_ports_arg);
}
if (!c->udp.fwd_in.f.mode || c->udp.fwd_in.f.mode == FWD_AUTO) {
c->udp.fwd_in.f.mode = FWD_AUTO;
ns_ports_arg.proto = IPPROTO_UDP;
NS_CALL(get_bound_ports_ns, &ns_ports_arg);
}
if (!c->tcp.fwd_out.mode || c->tcp.fwd_out.mode == FWD_AUTO) {
c->tcp.fwd_out.mode = FWD_AUTO;
get_bound_ports(c, 0, IPPROTO_TCP);
}
if (!c->udp.fwd_out.f.mode || c->udp.fwd_out.f.mode == FWD_AUTO) {
c->udp.fwd_out.f.mode = FWD_AUTO;
get_bound_ports(c, 0, IPPROTO_UDP);
}
} else {
if (!c->tcp.fwd_in.mode)
c->tcp.fwd_in.mode = FWD_NONE;
if (!c->tcp.fwd_out.mode)
c->tcp.fwd_out.mode = FWD_NONE;
if (!c->udp.fwd_in.f.mode)
c->udp.fwd_in.f.mode = FWD_NONE;
if (!c->udp.fwd_out.f.mode)
c->udp.fwd_out.f.mode = FWD_NONE;
}
if (!c->quiet)
conf_print(c);
}
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