| 1 | /* |
| 2 | * QEMU System Emulator |
| 3 | * |
| 4 | * Copyright (c) 2003-2008 Fabrice Bellard |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 22 | * THE SOFTWARE. |
| 23 | */ |
| 24 | |
| 25 | #include "qemu/osdep.h" |
| 26 | #include "chardev/char.h" |
| 27 | #include "io/channel-socket.h" |
| 28 | #include "qapi/error.h" |
| 29 | #include "qemu/module.h" |
| 30 | #include "qemu/option.h" |
| 31 | |
| 32 | #include "chardev/char-io.h" |
| 33 | #include "qom/object.h" |
| 34 | |
| 35 | /***********************************************************/ |
| 36 | /* UDP Net console */ |
| 37 | |
| 38 | struct UdpChardev { |
| 39 | Chardev parent; |
| 40 | QIOChannel *ioc; |
| 41 | uint8_t buf[CHR_READ_BUF_LEN]; |
| 42 | int bufcnt; |
| 43 | int bufptr; |
| 44 | int max_size; |
| 45 | }; |
| 46 | typedef struct UdpChardev UdpChardev; |
| 47 | |
| 48 | DECLARE_INSTANCE_CHECKER(UdpChardev, UDP_CHARDEV, |
| 49 | TYPE_CHARDEV_UDP) |
| 50 | |
| 51 | /* Called with chr_write_lock held. */ |
| 52 | static int udp_chr_write(Chardev *chr, const uint8_t *buf, int len) |
| 53 | { |
| 54 | UdpChardev *s = UDP_CHARDEV(chr); |
| 55 | |
| 56 | return qio_channel_write( |
| 57 | s->ioc, (const char *)buf, len, NULL); |
| 58 | } |
| 59 | |
| 60 | static void udp_chr_flush_buffer(UdpChardev *s) |
| 61 | { |
| 62 | Chardev *chr = CHARDEV(s); |
| 63 | |
| 64 | while (s->max_size > 0 && s->bufptr < s->bufcnt) { |
| 65 | int n = MIN(s->max_size, s->bufcnt - s->bufptr); |
| 66 | qemu_chr_be_write(chr, &s->buf[s->bufptr], n); |
| 67 | s->bufptr += n; |
| 68 | s->max_size = qemu_chr_be_can_write(chr); |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | static int udp_chr_read_poll(void *opaque) |
| 73 | { |
| 74 | Chardev *chr = CHARDEV(opaque); |
| 75 | UdpChardev *s = UDP_CHARDEV(opaque); |
| 76 | |
| 77 | s->max_size = qemu_chr_be_can_write(chr); |
| 78 | |
| 79 | /* If there were any stray characters in the queue process them |
| 80 | * first |
| 81 | */ |
| 82 | udp_chr_flush_buffer(s); |
| 83 | |
| 84 | return s->max_size; |
| 85 | } |
| 86 | |
| 87 | static gboolean udp_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque) |
| 88 | { |
| 89 | Chardev *chr = CHARDEV(opaque); |
| 90 | UdpChardev *s = UDP_CHARDEV(opaque); |
| 91 | ssize_t ret; |
| 92 | |
| 93 | if (s->max_size == 0) { |
| 94 | return TRUE; |
| 95 | } |
| 96 | ret = qio_channel_read( |
| 97 | s->ioc, (char *)s->buf, sizeof(s->buf), NULL); |
| 98 | if (ret <= 0) { |
| 99 | remove_fd_in_watch(chr); |
| 100 | return FALSE; |
| 101 | } |
| 102 | s->bufcnt = ret; |
| 103 | s->bufptr = 0; |
| 104 | udp_chr_flush_buffer(s); |
| 105 | |
| 106 | return TRUE; |
| 107 | } |
| 108 | |
| 109 | static void udp_chr_update_read_handler(Chardev *chr) |
| 110 | { |
| 111 | UdpChardev *s = UDP_CHARDEV(chr); |
| 112 | |
| 113 | remove_fd_in_watch(chr); |
| 114 | if (s->ioc) { |
| 115 | chr->gsource = io_add_watch_poll(chr, s->ioc, |
| 116 | udp_chr_read_poll, |
| 117 | udp_chr_read, chr, |
| 118 | chr->gcontext); |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | static void char_udp_finalize(Object *obj) |
| 123 | { |
| 124 | Chardev *chr = CHARDEV(obj); |
| 125 | UdpChardev *s = UDP_CHARDEV(obj); |
| 126 | |
| 127 | remove_fd_in_watch(chr); |
| 128 | if (s->ioc) { |
| 129 | object_unref(OBJECT(s->ioc)); |
| 130 | } |
| 131 | qemu_chr_be_event(chr, CHR_EVENT_CLOSED); |
| 132 | } |
| 133 | |
| 134 | static void udp_chr_parse(QemuOpts *opts, ChardevBackend *backend, Error **errp) |
| 135 | { |
| 136 | const char *host = qemu_opt_get(opts, "host"); |
| 137 | const char *port = qemu_opt_get(opts, "port"); |
| 138 | const char *localaddr = qemu_opt_get(opts, "localaddr"); |
| 139 | const char *localport = qemu_opt_get(opts, "localport"); |
| 140 | bool has_local = false; |
| 141 | SocketAddressLegacy *addr; |
| 142 | ChardevUdp *udp; |
| 143 | |
| 144 | backend->type = CHARDEV_BACKEND_KIND_UDP; |
| 145 | if (host == NULL || strlen(host) == 0) { |
| 146 | host = "localhost"; |
| 147 | } |
| 148 | if (port == NULL || strlen(port) == 0) { |
| 149 | error_setg(errp, "chardev: udp: remote port not specified"); |
| 150 | return; |
| 151 | } |
| 152 | if (localport == NULL || strlen(localport) == 0) { |
| 153 | localport = "0"; |
| 154 | } else { |
| 155 | has_local = true; |
| 156 | } |
| 157 | if (localaddr == NULL || strlen(localaddr) == 0) { |
| 158 | localaddr = ""; |
| 159 | } else { |
| 160 | has_local = true; |
| 161 | } |
| 162 | |
| 163 | udp = backend->u.udp.data = g_new0(ChardevUdp, 1); |
| 164 | qemu_chr_parse_common(opts, qapi_ChardevUdp_base(udp)); |
| 165 | |
| 166 | addr = g_new0(SocketAddressLegacy, 1); |
| 167 | addr->type = SOCKET_ADDRESS_TYPE_INET; |
| 168 | addr->u.inet.data = g_new(InetSocketAddress, 1); |
| 169 | *addr->u.inet.data = (InetSocketAddress) { |
| 170 | .host = g_strdup(host), |
| 171 | .port = g_strdup(port), |
| 172 | .has_ipv4 = qemu_opt_get(opts, "ipv4"), |
| 173 | .ipv4 = qemu_opt_get_bool(opts, "ipv4", 0), |
| 174 | .has_ipv6 = qemu_opt_get(opts, "ipv6"), |
| 175 | .ipv6 = qemu_opt_get_bool(opts, "ipv6", 0), |
| 176 | }; |
| 177 | udp->remote = addr; |
| 178 | |
| 179 | if (has_local) { |
| 180 | addr = g_new0(SocketAddressLegacy, 1); |
| 181 | addr->type = SOCKET_ADDRESS_TYPE_INET; |
| 182 | addr->u.inet.data = g_new(InetSocketAddress, 1); |
| 183 | *addr->u.inet.data = (InetSocketAddress) { |
| 184 | .host = g_strdup(localaddr), |
| 185 | .port = g_strdup(localport), |
| 186 | }; |
| 187 | udp->local = addr; |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | static bool upd_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp) |
| 192 | { |
| 193 | ChardevUdp *udp = backend->u.udp.data; |
| 194 | SocketAddress *local_addr = socket_address_flatten(udp->local); |
| 195 | SocketAddress *remote_addr = socket_address_flatten(udp->remote); |
| 196 | QIOChannelSocket *sioc = qio_channel_socket_new(); |
| 197 | char *name; |
| 198 | UdpChardev *s = UDP_CHARDEV(chr); |
| 199 | int ret; |
| 200 | |
| 201 | ret = qio_channel_socket_dgram_sync(sioc, local_addr, remote_addr, errp); |
| 202 | qapi_free_SocketAddress(local_addr); |
| 203 | qapi_free_SocketAddress(remote_addr); |
| 204 | if (ret < 0) { |
| 205 | object_unref(OBJECT(sioc)); |
| 206 | return false; |
| 207 | } |
| 208 | |
| 209 | name = g_strdup_printf("chardev-udp-%s", chr->label); |
| 210 | qio_channel_set_name(QIO_CHANNEL(sioc), name); |
| 211 | g_free(name); |
| 212 | |
| 213 | s->ioc = QIO_CHANNEL(sioc); |
| 214 | qemu_chr_be_event(chr, CHR_EVENT_OPENED); |
| 215 | return true; |
| 216 | } |
| 217 | |
| 218 | static void char_udp_class_init(ObjectClass *oc, const void *data) |
| 219 | { |
| 220 | ChardevClass *cc = CHARDEV_CLASS(oc); |
| 221 | |
| 222 | cc->chr_parse = udp_chr_parse; |
| 223 | cc->chr_open = upd_chr_open; |
| 224 | cc->chr_write = udp_chr_write; |
| 225 | cc->chr_update_read_handler = udp_chr_update_read_handler; |
| 226 | } |
| 227 | |
| 228 | static const TypeInfo char_udp_type_info = { |
| 229 | .name = TYPE_CHARDEV_UDP, |
| 230 | .parent = TYPE_CHARDEV, |
| 231 | .instance_size = sizeof(UdpChardev), |
| 232 | .instance_finalize = char_udp_finalize, |
| 233 | .class_init = char_udp_class_init, |
| 234 | }; |
| 235 | |
| 236 | static void register_types(void) |
| 237 | { |
| 238 | type_register_static(&char_udp_type_info); |
| 239 | } |
| 240 | |
| 241 | type_init(register_types); |