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qemu/net/slirp.c
Marc-André Lureau 95e30b2a13 chardev: mark the calls that allow an implicit mux monitor 
This is mostly for readability of the code. Let's make it clear which
callers can create an implicit monitor when the chardev is muxed.

This will also enforce a safer behaviour, as we don't really support
creating monitor anywhere/anytime at the moment. Add an assert() to
make sure the programmer explicitely wanted that behaviour.

There are documented cases, such as: -serial/-parallel/-virtioconsole
and to less extent -debugcon.

Less obvious and questionable ones are -gdb, SLIRP -guestfwd and Xen
console. Add a FIXME note for those, but keep the support for now.

Other qemu_chr_new() callers either have a fixed parameter/filename
string or do not need it, such as -qtest:

* qtest.c: qtest_init()
  Afaik, only used by tests/libqtest.c, without mux. I don't think we
  support it outside of qemu testing: drop support for implicit mux
  monitor (qemu_chr_new() call: no implicit mux now).

* hw/
  All with literal @filename argument that doesn't enable mux monitor.

* tests/
  All with @filename argument that doesn't enable mux monitor.

On a related note, the list of monitor creation places:

- the chardev creators listed above: all from command line (except
  perhaps Xen console?)

- -gdb & hmp gdbserver will create a "GDB monitor command" chardev
  that is wired to an HMP monitor.

- -mon command line option

From this short study, I would like to think that a monitor may only
be created in the main thread today, though I remain skeptical :)

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
2018-10-03 14:45:05 +04:00

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/*
* QEMU System Emulator
*
* Copyright (c) 2003-2008 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "net/slirp.h"
#ifndef _WIN32
#include <pwd.h>
#include <sys/wait.h>
#endif
#include "net/net.h"
#include "clients.h"
#include "hub.h"
#include "monitor/monitor.h"
#include "qemu/error-report.h"
#include "qemu/sockets.h"
#include "slirp/libslirp.h"
#include "slirp/ip6.h"
#include "chardev/char-fe.h"
#include "sysemu/sysemu.h"
#include "qemu/cutils.h"
#include "qapi/error.h"
#include "qapi/qmp/qdict.h"
static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
{
const char *p, *p1;
int len;
p = *pp;
p1 = strchr(p, sep);
if (!p1)
return -1;
len = p1 - p;
p1++;
if (buf_size > 0) {
if (len > buf_size - 1)
len = buf_size - 1;
memcpy(buf, p, len);
buf[len] = '\0';
}
*pp = p1;
return 0;
}
/* slirp network adapter */
#define SLIRP_CFG_HOSTFWD 1
struct slirp_config_str {
struct slirp_config_str *next;
int flags;
char str[1024];
};
typedef struct SlirpState {
NetClientState nc;
QTAILQ_ENTRY(SlirpState) entry;
Slirp *slirp;
Notifier exit_notifier;
#ifndef _WIN32
gchar *smb_dir;
#endif
} SlirpState;
static struct slirp_config_str *slirp_configs;
static QTAILQ_HEAD(slirp_stacks, SlirpState) slirp_stacks =
QTAILQ_HEAD_INITIALIZER(slirp_stacks);
static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp);
static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp);
#ifndef _WIN32
static int slirp_smb(SlirpState *s, const char *exported_dir,
struct in_addr vserver_addr, Error **errp);
static void slirp_smb_cleanup(SlirpState *s);
#else
static inline void slirp_smb_cleanup(SlirpState *s) { }
#endif
void slirp_output(void *opaque, const uint8_t *pkt, int pkt_len)
{
SlirpState *s = opaque;
qemu_send_packet(&s->nc, pkt, pkt_len);
}
static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size)
{
SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
slirp_input(s->slirp, buf, size);
return size;
}
static void slirp_smb_exit(Notifier *n, void *data)
{
SlirpState *s = container_of(n, SlirpState, exit_notifier);
slirp_smb_cleanup(s);
}
static void net_slirp_cleanup(NetClientState *nc)
{
SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
slirp_cleanup(s->slirp);
if (s->exit_notifier.notify) {
qemu_remove_exit_notifier(&s->exit_notifier);
}
slirp_smb_cleanup(s);
QTAILQ_REMOVE(&slirp_stacks, s, entry);
}
static NetClientInfo net_slirp_info = {
.type = NET_CLIENT_DRIVER_USER,
.size = sizeof(SlirpState),
.receive = net_slirp_receive,
.cleanup = net_slirp_cleanup,
};
static int net_slirp_init(NetClientState *peer, const char *model,
const char *name, int restricted,
bool ipv4, const char *vnetwork, const char *vhost,
bool ipv6, const char *vprefix6, int vprefix6_len,
const char *vhost6,
const char *vhostname, const char *tftp_export,
const char *bootfile, const char *vdhcp_start,
const char *vnameserver, const char *vnameserver6,
const char *smb_export, const char *vsmbserver,
const char **dnssearch, const char *vdomainname,
Error **errp)
{
/* default settings according to historic slirp */
struct in_addr net = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */
struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */
struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */
struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */
struct in_addr dns = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */
struct in6_addr ip6_prefix;
struct in6_addr ip6_host;
struct in6_addr ip6_dns;
#ifndef _WIN32
struct in_addr smbsrv = { .s_addr = 0 };
#endif
NetClientState *nc;
SlirpState *s;
char buf[20];
uint32_t addr;
int shift;
char *end;
struct slirp_config_str *config;
if (!ipv4 && (vnetwork || vhost || vnameserver)) {
error_setg(errp, "IPv4 disabled but netmask/host/dns provided");
return -1;
}
if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) {
error_setg(errp, "IPv6 disabled but prefix/host6/dns6 provided");
return -1;
}
if (!ipv4 && !ipv6) {
/* It doesn't make sense to disable both */
error_setg(errp, "IPv4 and IPv6 disabled");
return -1;
}
if (vnetwork) {
if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) {
if (!inet_aton(vnetwork, &net)) {
error_setg(errp, "Failed to parse netmask");
return -1;
}
addr = ntohl(net.s_addr);
if (!(addr & 0x80000000)) {
mask.s_addr = htonl(0xff000000); /* class A */
} else if ((addr & 0xfff00000) == 0xac100000) {
mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */
} else if ((addr & 0xc0000000) == 0x80000000) {
mask.s_addr = htonl(0xffff0000); /* class B */
} else if ((addr & 0xffff0000) == 0xc0a80000) {
mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */
} else if ((addr & 0xffff0000) == 0xc6120000) {
mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */
} else if ((addr & 0xe0000000) == 0xe0000000) {
mask.s_addr = htonl(0xffffff00); /* class C */
} else {
mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */
}
} else {
if (!inet_aton(buf, &net)) {
error_setg(errp, "Failed to parse netmask");
return -1;
}
shift = strtol(vnetwork, &end, 10);
if (*end != '\0') {
if (!inet_aton(vnetwork, &mask)) {
error_setg(errp,
"Failed to parse netmask (trailing chars)");
return -1;
}
} else if (shift < 4 || shift > 32) {
error_setg(errp,
"Invalid netmask provided (must be in range 4-32)");
return -1;
} else {
mask.s_addr = htonl(0xffffffff << (32 - shift));
}
}
net.s_addr &= mask.s_addr;
host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
}
if (vhost && !inet_aton(vhost, &host)) {
error_setg(errp, "Failed to parse host");
return -1;
}
if ((host.s_addr & mask.s_addr) != net.s_addr) {
error_setg(errp, "Host doesn't belong to network");
return -1;
}
if (vnameserver && !inet_aton(vnameserver, &dns)) {
error_setg(errp, "Failed to parse DNS");
return -1;
}
if ((dns.s_addr & mask.s_addr) != net.s_addr) {
error_setg(errp, "DNS doesn't belong to network");
return -1;
}
if (dns.s_addr == host.s_addr) {
error_setg(errp, "DNS must be different from host");
return -1;
}
if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
error_setg(errp, "Failed to parse DHCP start address");
return -1;
}
if ((dhcp.s_addr & mask.s_addr) != net.s_addr) {
error_setg(errp, "DHCP doesn't belong to network");
return -1;
}
if (dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) {
error_setg(errp, "DNS must be different from host and DNS");
return -1;
}
#ifndef _WIN32
if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
error_setg(errp, "Failed to parse SMB address");
return -1;
}
#endif
#if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
/* No inet_pton helper before Vista... */
if (vprefix6) {
/* Unsupported */
error_setg(errp, "IPv6 prefix not supported");
return -1;
}
memset(&ip6_prefix, 0, sizeof(ip6_prefix));
ip6_prefix.s6_addr[0] = 0xfe;
ip6_prefix.s6_addr[1] = 0xc0;
#else
if (!vprefix6) {
vprefix6 = "fec0::";
}
if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) {
error_setg(errp, "Failed to parse IPv6 prefix");
return -1;
}
#endif
if (!vprefix6_len) {
vprefix6_len = 64;
}
if (vprefix6_len < 0 || vprefix6_len > 126) {
error_setg(errp,
"Invalid prefix provided (prefix len must be in range 0-126");
return -1;
}
if (vhost6) {
#if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
error_setg(errp, "IPv6 host not supported");
return -1;
#else
if (!inet_pton(AF_INET6, vhost6, &ip6_host)) {
error_setg(errp, "Failed to parse IPv6 host");
return -1;
}
if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) {
error_setg(errp, "IPv6 Host doesn't belong to network");
return -1;
}
#endif
} else {
ip6_host = ip6_prefix;
ip6_host.s6_addr[15] |= 2;
}
if (vnameserver6) {
#if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
error_setg(errp, "IPv6 DNS not supported");
return -1;
#else
if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) {
error_setg(errp, "Failed to parse IPv6 DNS");
return -1;
}
if (!in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) {
error_setg(errp, "IPv6 DNS doesn't belong to network");
return -1;
}
#endif
} else {
ip6_dns = ip6_prefix;
ip6_dns.s6_addr[15] |= 3;
}
if (vdomainname && !*vdomainname) {
error_setg(errp, "'domainname' parameter cannot be empty");
return -1;
}
nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
snprintf(nc->info_str, sizeof(nc->info_str),
"net=%s,restrict=%s", inet_ntoa(net),
restricted ? "on" : "off");
s = DO_UPCAST(SlirpState, nc, nc);
s->slirp = slirp_init(restricted, ipv4, net, mask, host,
ipv6, ip6_prefix, vprefix6_len, ip6_host,
vhostname, tftp_export, bootfile, dhcp,
dns, ip6_dns, dnssearch, vdomainname, s);
QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
for (config = slirp_configs; config; config = config->next) {
if (config->flags & SLIRP_CFG_HOSTFWD) {
if (slirp_hostfwd(s, config->str, errp) < 0) {
goto error;
}
} else {
if (slirp_guestfwd(s, config->str, errp) < 0) {
goto error;
}
}
}
#ifndef _WIN32
if (smb_export) {
if (slirp_smb(s, smb_export, smbsrv, errp) < 0) {
goto error;
}
}
#endif
s->exit_notifier.notify = slirp_smb_exit;
qemu_add_exit_notifier(&s->exit_notifier);
return 0;
error:
qemu_del_net_client(nc);
return -1;
}
static SlirpState *slirp_lookup(Monitor *mon, const char *hub_id,
const char *name)
{
if (name) {
NetClientState *nc;
if (hub_id) {
nc = net_hub_find_client_by_name(strtol(hub_id, NULL, 0), name);
if (!nc) {
monitor_printf(mon, "unrecognized (hub-id, stackname) pair\n");
return NULL;
}
warn_report("Using 'hub-id' is deprecated, specify the netdev id "
"directly instead");
} else {
nc = qemu_find_netdev(name);
if (!nc) {
monitor_printf(mon, "unrecognized netdev id '%s'\n", name);
return NULL;
}
}
if (strcmp(nc->model, "user")) {
monitor_printf(mon, "invalid device specified\n");
return NULL;
}
return DO_UPCAST(SlirpState, nc, nc);
} else {
if (QTAILQ_EMPTY(&slirp_stacks)) {
monitor_printf(mon, "user mode network stack not in use\n");
return NULL;
}
return QTAILQ_FIRST(&slirp_stacks);
}
}
void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict)
{
struct in_addr host_addr = { .s_addr = INADDR_ANY };
int host_port;
char buf[256];
const char *src_str, *p;
SlirpState *s;
int is_udp = 0;
int err;
const char *arg1 = qdict_get_str(qdict, "arg1");
const char *arg2 = qdict_get_try_str(qdict, "arg2");
const char *arg3 = qdict_get_try_str(qdict, "arg3");
if (arg3) {
s = slirp_lookup(mon, arg1, arg2);
src_str = arg3;
} else if (arg2) {
s = slirp_lookup(mon, NULL, arg1);
src_str = arg2;
} else {
s = slirp_lookup(mon, NULL, NULL);
src_str = arg1;
}
if (!s) {
return;
}
p = src_str;
if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
goto fail_syntax;
}
if (!strcmp(buf, "tcp") || buf[0] == '\0') {
is_udp = 0;
} else if (!strcmp(buf, "udp")) {
is_udp = 1;
} else {
goto fail_syntax;
}
if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
goto fail_syntax;
}
if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
goto fail_syntax;
}
if (qemu_strtoi(p, NULL, 10, &host_port)) {
goto fail_syntax;
}
err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port);
monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
err ? "not found" : "removed");
return;
fail_syntax:
monitor_printf(mon, "invalid format\n");
}
static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp)
{
struct in_addr host_addr = { .s_addr = INADDR_ANY };
struct in_addr guest_addr = { .s_addr = 0 };
int host_port, guest_port;
const char *p;
char buf[256];
int is_udp;
char *end;
const char *fail_reason = "Unknown reason";
p = redir_str;
if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
fail_reason = "No : separators";
goto fail_syntax;
}
if (!strcmp(buf, "tcp") || buf[0] == '\0') {
is_udp = 0;
} else if (!strcmp(buf, "udp")) {
is_udp = 1;
} else {
fail_reason = "Bad protocol name";
goto fail_syntax;
}
if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
fail_reason = "Missing : separator";
goto fail_syntax;
}
if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
fail_reason = "Bad host address";
goto fail_syntax;
}
if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
fail_reason = "Bad host port separator";
goto fail_syntax;
}
host_port = strtol(buf, &end, 0);
if (*end != '\0' || host_port < 0 || host_port > 65535) {
fail_reason = "Bad host port";
goto fail_syntax;
}
if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
fail_reason = "Missing guest address";
goto fail_syntax;
}
if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
fail_reason = "Bad guest address";
goto fail_syntax;
}
guest_port = strtol(p, &end, 0);
if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
fail_reason = "Bad guest port";
goto fail_syntax;
}
if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
guest_port) < 0) {
error_setg(errp, "Could not set up host forwarding rule '%s'",
redir_str);
return -1;
}
return 0;
fail_syntax:
error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str,
fail_reason);
return -1;
}
void hmp_hostfwd_add(Monitor *mon, const QDict *qdict)
{
const char *redir_str;
SlirpState *s;
const char *arg1 = qdict_get_str(qdict, "arg1");
const char *arg2 = qdict_get_try_str(qdict, "arg2");
const char *arg3 = qdict_get_try_str(qdict, "arg3");
if (arg3) {
s = slirp_lookup(mon, arg1, arg2);
redir_str = arg3;
} else if (arg2) {
s = slirp_lookup(mon, NULL, arg1);
redir_str = arg2;
} else {
s = slirp_lookup(mon, NULL, NULL);
redir_str = arg1;
}
if (s) {
Error *err = NULL;
if (slirp_hostfwd(s, redir_str, &err) < 0) {
error_report_err(err);
}
}
}
#ifndef _WIN32
/* automatic user mode samba server configuration */
static void slirp_smb_cleanup(SlirpState *s)
{
int ret;
if (s->smb_dir) {
gchar *cmd = g_strdup_printf("rm -rf %s", s->smb_dir);
ret = system(cmd);
if (ret == -1 || !WIFEXITED(ret)) {
error_report("'%s' failed.", cmd);
} else if (WEXITSTATUS(ret)) {
error_report("'%s' failed. Error code: %d",
cmd, WEXITSTATUS(ret));
}
g_free(cmd);
g_free(s->smb_dir);
s->smb_dir = NULL;
}
}
static int slirp_smb(SlirpState* s, const char *exported_dir,
struct in_addr vserver_addr, Error **errp)
{
char *smb_conf;
char *smb_cmdline;
struct passwd *passwd;
FILE *f;
passwd = getpwuid(geteuid());
if (!passwd) {
error_setg(errp, "Failed to retrieve user name");
return -1;
}
if (access(CONFIG_SMBD_COMMAND, F_OK)) {
error_setg(errp, "Could not find '%s', please install it",
CONFIG_SMBD_COMMAND);
return -1;
}
if (access(exported_dir, R_OK | X_OK)) {
error_setg(errp, "Error accessing shared directory '%s': %s",
exported_dir, strerror(errno));
return -1;
}
s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL);
if (!s->smb_dir) {
error_setg(errp, "Could not create samba server dir");
return -1;
}
smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf");
f = fopen(smb_conf, "w");
if (!f) {
slirp_smb_cleanup(s);
error_setg(errp,
"Could not create samba server configuration file '%s'",
smb_conf);
g_free(smb_conf);
return -1;
}
fprintf(f,
"[global]\n"
"private dir=%s\n"
"interfaces=127.0.0.1\n"
"bind interfaces only=yes\n"
"pid directory=%s\n"
"lock directory=%s\n"
"state directory=%s\n"
"cache directory=%s\n"
"ncalrpc dir=%s/ncalrpc\n"
"log file=%s/log.smbd\n"
"smb passwd file=%s/smbpasswd\n"
"security = user\n"
"map to guest = Bad User\n"
"load printers = no\n"
"printing = bsd\n"
"disable spoolss = yes\n"
"usershare max shares = 0\n"
"[qemu]\n"
"path=%s\n"
"read only=no\n"
"guest ok=yes\n"
"force user=%s\n",
s->smb_dir,
s->smb_dir,
s->smb_dir,
s->smb_dir,
s->smb_dir,
s->smb_dir,
s->smb_dir,
s->smb_dir,
exported_dir,
passwd->pw_name
);
fclose(f);
smb_cmdline = g_strdup_printf("%s -l %s -s %s",
CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf);
g_free(smb_conf);
if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0 ||
slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 445) < 0) {
slirp_smb_cleanup(s);
g_free(smb_cmdline);
error_setg(errp, "Conflicting/invalid smbserver address");
return -1;
}
g_free(smb_cmdline);
return 0;
}
#endif /* !defined(_WIN32) */
struct GuestFwd {
CharBackend hd;
struct in_addr server;
int port;
Slirp *slirp;
};
static int guestfwd_can_read(void *opaque)
{
struct GuestFwd *fwd = opaque;
return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
}
static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
{
struct GuestFwd *fwd = opaque;
slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
}
static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp)
{
struct in_addr server = { .s_addr = 0 };
struct GuestFwd *fwd;
const char *p;
char buf[128];
char *end;
int port;
p = config_str;
if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
goto fail_syntax;
}
if (strcmp(buf, "tcp") && buf[0] != '\0') {
goto fail_syntax;
}
if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
goto fail_syntax;
}
if (buf[0] != '\0' && !inet_aton(buf, &server)) {
goto fail_syntax;
}
if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
goto fail_syntax;
}
port = strtol(buf, &end, 10);
if (*end != '\0' || port < 1 || port > 65535) {
goto fail_syntax;
}
snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port);
if ((strlen(p) > 4) && !strncmp(p, "cmd:", 4)) {
if (slirp_add_exec(s->slirp, 0, &p[4], &server, port) < 0) {
error_setg(errp, "Conflicting/invalid host:port in guest "
"forwarding rule '%s'", config_str);
return -1;
}
} else {
Error *err = NULL;
/*
* FIXME: sure we want to support implicit
* muxed monitors here?
*/
Chardev *chr = qemu_chr_new_mux_mon(buf, p);
if (!chr) {
error_setg(errp, "Could not open guest forwarding device '%s'",
buf);
return -1;
}
fwd = g_new(struct GuestFwd, 1);
qemu_chr_fe_init(&fwd->hd, chr, &err);
if (err) {
error_propagate(errp, err);
g_free(fwd);
return -1;
}
if (slirp_add_exec(s->slirp, 3, &fwd->hd, &server, port) < 0) {
error_setg(errp, "Conflicting/invalid host:port in guest "
"forwarding rule '%s'", config_str);
g_free(fwd);
return -1;
}
fwd->server = server;
fwd->port = port;
fwd->slirp = s->slirp;
qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read,
NULL, NULL, fwd, NULL, true);
}
return 0;
fail_syntax:
error_setg(errp, "Invalid guest forwarding rule '%s'", config_str);
return -1;
}
void hmp_info_usernet(Monitor *mon, const QDict *qdict)
{
SlirpState *s;
QTAILQ_FOREACH(s, &slirp_stacks, entry) {
int id;
bool got_hub_id = net_hub_id_for_client(&s->nc, &id) == 0;
monitor_printf(mon, "Hub %d (%s):\n",
got_hub_id ? id : -1,
s->nc.name);
slirp_connection_info(s->slirp, mon);
}
}
static void
net_init_slirp_configs(const StringList *fwd, int flags)
{
while (fwd) {
struct slirp_config_str *config;
config = g_malloc0(sizeof(*config));
pstrcpy(config->str, sizeof(config->str), fwd->value->str);
config->flags = flags;
config->next = slirp_configs;
slirp_configs = config;
fwd = fwd->next;
}
}
static const char **slirp_dnssearch(const StringList *dnsname)
{
const StringList *c = dnsname;
size_t i = 0, num_opts = 0;
const char **ret;
while (c) {
num_opts++;
c = c->next;
}
if (num_opts == 0) {
return NULL;
}
ret = g_malloc((num_opts + 1) * sizeof(*ret));
c = dnsname;
while (c) {
ret[i++] = c->value->str;
c = c->next;
}
ret[i] = NULL;
return ret;
}
int net_init_slirp(const Netdev *netdev, const char *name,
NetClientState *peer, Error **errp)
{
struct slirp_config_str *config;
char *vnet;
int ret;
const NetdevUserOptions *user;
const char **dnssearch;
bool ipv4 = true, ipv6 = true;
assert(netdev->type == NET_CLIENT_DRIVER_USER);
user = &netdev->u.user;
if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) ||
(user->has_ipv4 && !user->ipv4)) {
ipv4 = 0;
}
if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) ||
(user->has_ipv6 && !user->ipv6)) {
ipv6 = 0;
}
vnet = user->has_net ? g_strdup(user->net) :
user->has_ip ? g_strdup_printf("%s/24", user->ip) :
NULL;
dnssearch = slirp_dnssearch(user->dnssearch);
/* all optional fields are initialized to "all bits zero" */
net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD);
net_init_slirp_configs(user->guestfwd, 0);
ret = net_slirp_init(peer, "user", name, user->q_restrict,
ipv4, vnet, user->host,
ipv6, user->ipv6_prefix, user->ipv6_prefixlen,
user->ipv6_host, user->hostname, user->tftp,
user->bootfile, user->dhcpstart,
user->dns, user->ipv6_dns, user->smb,
user->smbserver, dnssearch, user->domainname, errp);
while (slirp_configs) {
config = slirp_configs;
slirp_configs = config->next;
g_free(config);
}
g_free(vnet);
g_free(dnssearch);
return ret;
}
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