/* * 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 #include #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(, 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 static void net_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, const char *tftp_server_name, 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; } if (vdomainname && strlen(vdomainname) > 255) { error_setg(errp, "'domainname' parameter cannot exceed 255 bytes"); return -1; } if (vhostname && strlen(vhostname) > 255) { error_setg(errp, "'vhostname' parameter cannot exceed 255 bytes"); return -1; } if (tftp_server_name && strlen(tftp_server_name) > 255) { error_setg(errp, "'tftp-server-name' parameter cannot exceed 255 bytes"); 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_server_name, tftp_export, bootfile, dhcp, dns, ip6_dns, dnssearch, vdomainname, net_slirp_output, 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, NULL, smb_cmdline, &vserver_addr, 139) < 0 || slirp_add_exec(s->slirp, NULL, 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, NULL, &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, &fwd->hd, NULL, &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; char *info = slirp_connection_info(s->slirp); monitor_printf(mon, "Hub %d (%s):\n%s", got_hub_id ? id : -1, s->nc.name, info); g_free(info); } } 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, user->tftp_server_name, errp); while (slirp_configs) { config = slirp_configs; slirp_configs = config->next; g_free(config); } g_free(vnet); g_free(dnssearch); return ret; }