/* * 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 "net/slirp.h" #include "config-host.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/sockets.h" #include "slirp/libslirp.h" #include "char/char.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 #define SLIRP_CFG_LEGACY 2 struct slirp_config_str { struct slirp_config_str *next; int flags; char str[1024]; int legacy_format; }; typedef struct SlirpState { NetClientState nc; QTAILQ_ENTRY(SlirpState) entry; Slirp *slirp; #ifndef _WIN32 char smb_dir[128]; #endif } SlirpState; static struct slirp_config_str *slirp_configs; const char *legacy_tftp_prefix; const char *legacy_bootp_filename; static QTAILQ_HEAD(slirp_stacks, SlirpState) slirp_stacks = QTAILQ_HEAD_INITIALIZER(slirp_stacks); static int slirp_hostfwd(SlirpState *s, const char *redir_str, int legacy_format); static int slirp_guestfwd(SlirpState *s, const char *config_str, int legacy_format); #ifndef _WIN32 static const char *legacy_smb_export; static int slirp_smb(SlirpState *s, const char *exported_dir, struct in_addr vserver_addr); 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 net_slirp_cleanup(NetClientState *nc) { SlirpState *s = DO_UPCAST(SlirpState, nc, nc); slirp_cleanup(s->slirp); slirp_smb_cleanup(s); QTAILQ_REMOVE(&slirp_stacks, s, entry); } static NetClientInfo net_slirp_info = { .type = NET_CLIENT_OPTIONS_KIND_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, const char *vnetwork, const char *vhost, const char *vhostname, const char *tftp_export, const char *bootfile, const char *vdhcp_start, const char *vnameserver, const char *smb_export, const char *vsmbserver, const char **dnssearch) { /* 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 */ #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 (!tftp_export) { tftp_export = legacy_tftp_prefix; } if (!bootfile) { bootfile = legacy_bootp_filename; } if (vnetwork) { if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) { if (!inet_aton(vnetwork, &net)) { 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)) { return -1; } shift = strtol(vnetwork, &end, 10); if (*end != '\0') { if (!inet_aton(vnetwork, &mask)) { return -1; } } else if (shift < 4 || shift > 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)) { return -1; } if ((host.s_addr & mask.s_addr) != net.s_addr) { return -1; } if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) { return -1; } if ((dhcp.s_addr & mask.s_addr) != net.s_addr || dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) { return -1; } if (vnameserver && !inet_aton(vnameserver, &dns)) { return -1; } if ((dns.s_addr & mask.s_addr) != net.s_addr || dns.s_addr == host.s_addr) { return -1; } #ifndef _WIN32 if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) { return -1; } #endif 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, net, mask, host, vhostname, tftp_export, bootfile, dhcp, dns, dnssearch, 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, config->flags & SLIRP_CFG_LEGACY) < 0) goto error; } else { if (slirp_guestfwd(s, config->str, config->flags & SLIRP_CFG_LEGACY) < 0) goto error; } } #ifndef _WIN32 if (!smb_export) { smb_export = legacy_smb_export; } if (smb_export) { if (slirp_smb(s, smb_export, smbsrv) < 0) goto error; } #endif return 0; error: qemu_del_net_client(nc); return -1; } static SlirpState *slirp_lookup(Monitor *mon, const char *vlan, const char *stack) { if (vlan) { NetClientState *nc; nc = net_hub_find_client_by_name(strtol(vlan, NULL, 0), stack); if (!nc) { 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 net_slirp_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 (arg2) { s = slirp_lookup(mon, arg1, arg2); src_str = arg3; } 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; } host_port = atoi(p); err = slirp_remove_hostfwd(QTAILQ_FIRST(&slirp_stacks)->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, int legacy_format) { 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; p = redir_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 (!legacy_format) { 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 (get_str_sep(buf, sizeof(buf), &p, legacy_format ? ':' : '-') < 0) { goto fail_syntax; } host_port = strtol(buf, &end, 0); if (*end != '\0' || host_port < 1 || host_port > 65535) { goto fail_syntax; } if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { goto fail_syntax; } if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) { goto fail_syntax; } guest_port = strtol(p, &end, 0); if (*end != '\0' || guest_port < 1 || guest_port > 65535) { goto fail_syntax; } if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr, guest_port) < 0) { error_report("could not set up host forwarding rule '%s'", redir_str); return -1; } return 0; fail_syntax: error_report("invalid host forwarding rule '%s'", redir_str); return -1; } void net_slirp_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 (arg2) { s = slirp_lookup(mon, arg1, arg2); redir_str = arg3; } else { s = slirp_lookup(mon, NULL, NULL); redir_str = arg1; } if (s) { slirp_hostfwd(s, redir_str, 0); } } int net_slirp_redir(const char *redir_str) { struct slirp_config_str *config; if (QTAILQ_EMPTY(&slirp_stacks)) { config = g_malloc(sizeof(*config)); pstrcpy(config->str, sizeof(config->str), redir_str); config->flags = SLIRP_CFG_HOSTFWD | SLIRP_CFG_LEGACY; config->next = slirp_configs; slirp_configs = config; return 0; } return slirp_hostfwd(QTAILQ_FIRST(&slirp_stacks), redir_str, 1); } #ifndef _WIN32 /* automatic user mode samba server configuration */ static void slirp_smb_cleanup(SlirpState *s) { char cmd[128]; int ret; if (s->smb_dir[0] != '\0') { snprintf(cmd, sizeof(cmd), "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)); } s->smb_dir[0] = '\0'; } } static int slirp_smb(SlirpState* s, const char *exported_dir, struct in_addr vserver_addr) { static int instance; char smb_conf[128]; char smb_cmdline[128]; struct passwd *passwd; FILE *f; passwd = getpwuid(geteuid()); if (!passwd) { error_report("failed to retrieve user name"); return -1; } if (access(CONFIG_SMBD_COMMAND, F_OK)) { error_report("could not find '%s', please install it", CONFIG_SMBD_COMMAND); return -1; } if (access(exported_dir, R_OK | X_OK)) { error_report("error accessing shared directory '%s': %s", exported_dir, strerror(errno)); return -1; } snprintf(s->smb_dir, sizeof(s->smb_dir), "/tmp/qemu-smb.%ld-%d", (long)getpid(), instance++); if (mkdir(s->smb_dir, 0700) < 0) { error_report("could not create samba server dir '%s'", s->smb_dir); return -1; } snprintf(smb_conf, sizeof(smb_conf), "%s/%s", s->smb_dir, "smb.conf"); f = fopen(smb_conf, "w"); if (!f) { slirp_smb_cleanup(s); error_report("could not create samba server configuration file '%s'", smb_conf); return -1; } fprintf(f, "[global]\n" "private dir=%s\n" "socket address=127.0.0.1\n" "pid directory=%s\n" "lock directory=%s\n" "state directory=%s\n" "log file=%s/log.smbd\n" "smb passwd file=%s/smbpasswd\n" "security = share\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, exported_dir, passwd->pw_name ); fclose(f); snprintf(smb_cmdline, sizeof(smb_cmdline), "%s -s %s", CONFIG_SMBD_COMMAND, smb_conf); if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0) { slirp_smb_cleanup(s); error_report("conflicting/invalid smbserver address"); return -1; } return 0; } /* automatic user mode samba server configuration (legacy interface) */ int net_slirp_smb(const char *exported_dir) { struct in_addr vserver_addr = { .s_addr = 0 }; if (legacy_smb_export) { fprintf(stderr, "-smb given twice\n"); return -1; } legacy_smb_export = exported_dir; if (!QTAILQ_EMPTY(&slirp_stacks)) { return slirp_smb(QTAILQ_FIRST(&slirp_stacks), exported_dir, vserver_addr); } return 0; } #endif /* !defined(_WIN32) */ struct GuestFwd { CharDriverState *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, int legacy_format) { struct in_addr server = { .s_addr = 0 }; struct GuestFwd *fwd; const char *p; char buf[128]; char *end; int port; p = config_str; if (legacy_format) { if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { goto fail_syntax; } } else { 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; } fwd = g_malloc(sizeof(struct GuestFwd)); 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_report("conflicting/invalid host:port in guest forwarding " "rule '%s'", config_str); g_free(fwd); return -1; } } else { fwd->hd = qemu_chr_new(buf, p, NULL); if (!fwd->hd) { error_report("could not open guest forwarding device '%s'", buf); g_free(fwd); return -1; } if (slirp_add_exec(s->slirp, 3, fwd->hd, &server, port) < 0) { error_report("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_add_handlers(fwd->hd, guestfwd_can_read, guestfwd_read, NULL, fwd); } return 0; fail_syntax: error_report("invalid guest forwarding rule '%s'", config_str); return -1; } void do_info_usernet(Monitor *mon, const QDict *qdict) { SlirpState *s; QTAILQ_FOREACH(s, &slirp_stacks, entry) { int id; bool got_vlan_id = net_hub_id_for_client(&s->nc, &id) == 0; monitor_printf(mon, "VLAN %d (%s):\n", got_vlan_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 NetClientOptions *opts, const char *name, NetClientState *peer) { struct slirp_config_str *config; char *vnet; int ret; const NetdevUserOptions *user; const char **dnssearch; assert(opts->kind == NET_CLIENT_OPTIONS_KIND_USER); user = opts->user; 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, vnet, user->host, user->hostname, user->tftp, user->bootfile, user->dhcpstart, user->dns, user->smb, user->smbserver, dnssearch); while (slirp_configs) { config = slirp_configs; slirp_configs = config->next; g_free(config); } g_free(vnet); g_free(dnssearch); return ret; } int net_slirp_parse_legacy(QemuOptsList *opts_list, const char *optarg, int *ret) { if (strcmp(opts_list->name, "net") != 0 || strncmp(optarg, "channel,", strlen("channel,")) != 0) { return 0; } /* handle legacy -net channel,port:chr */ optarg += strlen("channel,"); if (QTAILQ_EMPTY(&slirp_stacks)) { struct slirp_config_str *config; config = g_malloc(sizeof(*config)); pstrcpy(config->str, sizeof(config->str), optarg); config->flags = SLIRP_CFG_LEGACY; config->next = slirp_configs; slirp_configs = config; *ret = 0; } else { *ret = slirp_guestfwd(QTAILQ_FIRST(&slirp_stacks), optarg, 1); } return 1; }