| 1 | #include "qemu/osdep.h" |
| 2 | #include "qemu/cutils.h" |
| 3 | #include <termios.h> |
| 4 | #include "qapi/error.h" |
| 5 | #include "qemu/sockets.h" |
| 6 | #include "channel.h" |
| 7 | #include "cutils.h" |
| 8 | |
| 9 | #ifdef CONFIG_SOLARIS |
| 10 | #include <stropts.h> |
| 11 | #endif |
| 12 | |
| 13 | #define GA_CHANNEL_BAUDRATE_DEFAULT B38400 /* for isa-serial channels */ |
| 14 | |
| 15 | struct GAChannel { |
| 16 | GIOChannel *listen_channel; |
| 17 | GIOChannel *client_channel; |
| 18 | GAChannelMethod method; |
| 19 | GAChannelCallback event_cb; |
| 20 | gpointer user_data; |
| 21 | }; |
| 22 | |
| 23 | static int ga_channel_client_add(GAChannel *c, int fd); |
| 24 | |
| 25 | static gboolean ga_channel_listen_accept(GIOChannel *channel, |
| 26 | GIOCondition condition, gpointer data) |
| 27 | { |
| 28 | GAChannel *c = data; |
| 29 | int ret, client_fd; |
| 30 | bool accepted = false; |
| 31 | Error *err = NULL; |
| 32 | |
| 33 | g_assert(channel != NULL); |
| 34 | |
| 35 | client_fd = qemu_accept(g_io_channel_unix_get_fd(channel), NULL, NULL); |
| 36 | if (client_fd == -1) { |
| 37 | g_warning("error converting fd to gsocket: %s", strerror(errno)); |
| 38 | goto out; |
| 39 | } |
| 40 | if (!qemu_set_blocking(client_fd, false, &err)) { |
| 41 | g_warning("%s", error_get_pretty(err)); |
| 42 | error_free(err); |
| 43 | goto out; |
| 44 | } |
| 45 | ret = ga_channel_client_add(c, client_fd); |
| 46 | if (ret) { |
| 47 | g_warning("error setting up connection"); |
| 48 | close(client_fd); |
| 49 | goto out; |
| 50 | } |
| 51 | accepted = true; |
| 52 | |
| 53 | out: |
| 54 | /* only accept 1 connection at a time */ |
| 55 | return !accepted; |
| 56 | } |
| 57 | |
| 58 | /* start polling for readable events on listen fd, new==true |
| 59 | * indicates we should use the existing s->listen_channel |
| 60 | */ |
| 61 | static void ga_channel_listen_add(GAChannel *c, int listen_fd, bool create) |
| 62 | { |
| 63 | if (create) { |
| 64 | c->listen_channel = g_io_channel_unix_new(listen_fd); |
| 65 | } |
| 66 | g_io_add_watch(c->listen_channel, G_IO_IN, ga_channel_listen_accept, c); |
| 67 | } |
| 68 | |
| 69 | static void ga_channel_listen_close(GAChannel *c) |
| 70 | { |
| 71 | g_assert(c->listen_channel); |
| 72 | g_io_channel_shutdown(c->listen_channel, true, NULL); |
| 73 | g_io_channel_unref(c->listen_channel); |
| 74 | c->listen_channel = NULL; |
| 75 | } |
| 76 | |
| 77 | /* cleanup state for closed connection/session, start accepting new |
| 78 | * connections if we're in listening mode |
| 79 | */ |
| 80 | static void ga_channel_client_close(GAChannel *c) |
| 81 | { |
| 82 | g_assert(c->client_channel); |
| 83 | g_io_channel_shutdown(c->client_channel, true, NULL); |
| 84 | g_io_channel_unref(c->client_channel); |
| 85 | c->client_channel = NULL; |
| 86 | if (c->listen_channel) { |
| 87 | ga_channel_listen_add(c, 0, false); |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | static gboolean ga_channel_client_event(GIOChannel *channel, |
| 92 | GIOCondition condition, gpointer data) |
| 93 | { |
| 94 | GAChannel *c = data; |
| 95 | gboolean client_cont; |
| 96 | |
| 97 | g_assert(c); |
| 98 | if (c->event_cb) { |
| 99 | client_cont = c->event_cb(condition, c->user_data); |
| 100 | if (!client_cont) { |
| 101 | ga_channel_client_close(c); |
| 102 | return false; |
| 103 | } |
| 104 | } |
| 105 | return true; |
| 106 | } |
| 107 | |
| 108 | static int ga_channel_client_add(GAChannel *c, int fd) |
| 109 | { |
| 110 | GIOChannel *client_channel; |
| 111 | GError *err = NULL; |
| 112 | |
| 113 | g_assert(c && !c->client_channel); |
| 114 | client_channel = g_io_channel_unix_new(fd); |
| 115 | g_assert(client_channel); |
| 116 | g_io_channel_set_encoding(client_channel, NULL, &err); |
| 117 | if (err != NULL) { |
| 118 | g_warning("error setting channel encoding to binary"); |
| 119 | g_error_free(err); |
| 120 | return -1; |
| 121 | } |
| 122 | g_io_add_watch(client_channel, G_IO_IN | G_IO_HUP, |
| 123 | ga_channel_client_event, c); |
| 124 | c->client_channel = client_channel; |
| 125 | return 0; |
| 126 | } |
| 127 | |
| 128 | static gboolean ga_channel_open(GAChannel *c, const gchar *path, |
| 129 | GAChannelMethod method, int fd, Error **errp) |
| 130 | { |
| 131 | int ret; |
| 132 | c->method = method; |
| 133 | |
| 134 | switch (c->method) { |
| 135 | case GA_CHANNEL_VIRTIO_SERIAL: { |
| 136 | assert(fd < 0); |
| 137 | fd = qga_open_cloexec( |
| 138 | path, |
| 139 | #ifndef CONFIG_SOLARIS |
| 140 | O_ASYNC | |
| 141 | #endif |
| 142 | O_RDWR | O_NONBLOCK, |
| 143 | 0 |
| 144 | ); |
| 145 | if (fd == -1) { |
| 146 | error_setg_errno(errp, errno, "error opening channel '%s'", path); |
| 147 | return false; |
| 148 | } |
| 149 | #ifdef CONFIG_SOLARIS |
| 150 | ret = ioctl(fd, I_SETSIG, S_OUTPUT | S_INPUT | S_HIPRI); |
| 151 | if (ret == -1) { |
| 152 | error_setg_errno(errp, errno, "error setting event mask for channel"); |
| 153 | close(fd); |
| 154 | return false; |
| 155 | } |
| 156 | #endif |
| 157 | #ifdef __FreeBSD__ |
| 158 | /* |
| 159 | * In the default state channel sends echo of every command to a |
| 160 | * client. The client program doesn't expect this and raises an |
| 161 | * error. Suppress echo by resetting ECHO terminal flag. |
| 162 | */ |
| 163 | struct termios tio; |
| 164 | if (tcgetattr(fd, &tio) < 0) { |
| 165 | error_setg_errno(errp, errno, "error getting channel termios attrs"); |
| 166 | close(fd); |
| 167 | return false; |
| 168 | } |
| 169 | tio.c_lflag &= ~ECHO; |
| 170 | if (tcsetattr(fd, TCSAFLUSH, &tio) < 0) { |
| 171 | error_setg_errno(errp, errno, "error setting channel termios attrs"); |
| 172 | close(fd); |
| 173 | return false; |
| 174 | } |
| 175 | #endif /* __FreeBSD__ */ |
| 176 | ret = ga_channel_client_add(c, fd); |
| 177 | if (ret) { |
| 178 | error_setg(errp, "error adding channel to main loop"); |
| 179 | close(fd); |
| 180 | return false; |
| 181 | } |
| 182 | break; |
| 183 | } |
| 184 | case GA_CHANNEL_ISA_SERIAL: { |
| 185 | struct termios tio; |
| 186 | |
| 187 | assert(fd < 0); |
| 188 | fd = qga_open_cloexec(path, O_RDWR | O_NOCTTY | O_NONBLOCK, 0); |
| 189 | if (fd == -1) { |
| 190 | error_setg_errno(errp, errno, "error opening channel '%s'", path); |
| 191 | return false; |
| 192 | } |
| 193 | tcgetattr(fd, &tio); |
| 194 | /* set up serial port for non-canonical, dumb byte streaming */ |
| 195 | tio.c_iflag &= ~(IGNBRK | BRKINT | IGNPAR | PARMRK | INPCK | ISTRIP | |
| 196 | INLCR | IGNCR | ICRNL | IXON | IXOFF | IXANY | |
| 197 | IMAXBEL); |
| 198 | tio.c_oflag = 0; |
| 199 | tio.c_lflag = 0; |
| 200 | tio.c_cflag |= GA_CHANNEL_BAUDRATE_DEFAULT; |
| 201 | /* 1 available byte min or reads will block (we'll set non-blocking |
| 202 | * elsewhere, else we have to deal with read()=0 instead) |
| 203 | */ |
| 204 | tio.c_cc[VMIN] = 1; |
| 205 | tio.c_cc[VTIME] = 0; |
| 206 | /* flush everything waiting for read/xmit, it's garbage at this point */ |
| 207 | tcflush(fd, TCIFLUSH); |
| 208 | tcsetattr(fd, TCSANOW, &tio); |
| 209 | ret = ga_channel_client_add(c, fd); |
| 210 | if (ret) { |
| 211 | error_setg(errp, "error adding channel to main loop"); |
| 212 | close(fd); |
| 213 | return false; |
| 214 | } |
| 215 | break; |
| 216 | } |
| 217 | case GA_CHANNEL_UNIX_LISTEN: { |
| 218 | if (fd < 0) { |
| 219 | fd = unix_listen(path, errp); |
| 220 | if (fd < 0) { |
| 221 | return false; |
| 222 | } |
| 223 | } |
| 224 | ga_channel_listen_add(c, fd, true); |
| 225 | break; |
| 226 | } |
| 227 | case GA_CHANNEL_VSOCK_LISTEN: { |
| 228 | if (fd < 0) { |
| 229 | SocketAddress *addr; |
| 230 | char *addr_str; |
| 231 | |
| 232 | addr_str = g_strdup_printf("vsock:%s", path); |
| 233 | addr = socket_parse(addr_str, errp); |
| 234 | g_free(addr_str); |
| 235 | if (!addr) { |
| 236 | return false; |
| 237 | } |
| 238 | |
| 239 | fd = socket_listen(addr, 1, errp); |
| 240 | qapi_free_SocketAddress(addr); |
| 241 | if (fd < 0) { |
| 242 | return false; |
| 243 | } |
| 244 | } |
| 245 | ga_channel_listen_add(c, fd, true); |
| 246 | break; |
| 247 | } |
| 248 | default: |
| 249 | error_setg(errp, "error binding/listening to specified socket"); |
| 250 | return false; |
| 251 | } |
| 252 | |
| 253 | return true; |
| 254 | } |
| 255 | |
| 256 | GIOStatus ga_channel_write_all(GAChannel *c, const gchar *buf, gsize size) |
| 257 | { |
| 258 | GError *err = NULL; |
| 259 | gsize written = 0; |
| 260 | GIOStatus status = G_IO_STATUS_NORMAL; |
| 261 | |
| 262 | while (size) { |
| 263 | g_debug("sending data, count: %d", (int)size); |
| 264 | status = g_io_channel_write_chars(c->client_channel, buf, size, |
| 265 | &written, &err); |
| 266 | if (status == G_IO_STATUS_NORMAL) { |
| 267 | size -= written; |
| 268 | buf += written; |
| 269 | } else if (status != G_IO_STATUS_AGAIN) { |
| 270 | g_warning("error writing to channel: %s", err->message); |
| 271 | return status; |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | do { |
| 276 | status = g_io_channel_flush(c->client_channel, &err); |
| 277 | } while (status == G_IO_STATUS_AGAIN); |
| 278 | |
| 279 | if (status != G_IO_STATUS_NORMAL) { |
| 280 | g_warning("error flushing channel: %s", err->message); |
| 281 | } |
| 282 | |
| 283 | return status; |
| 284 | } |
| 285 | |
| 286 | GIOStatus ga_channel_read(GAChannel *c, gchar *buf, gsize size, gsize *count) |
| 287 | { |
| 288 | return g_io_channel_read_chars(c->client_channel, buf, size, count, NULL); |
| 289 | } |
| 290 | |
| 291 | GAChannel *ga_channel_new(GAChannelMethod method, const gchar *path, |
| 292 | int listen_fd, GAChannelCallback cb, gpointer opaque) |
| 293 | { |
| 294 | Error *err = NULL; |
| 295 | GAChannel *c = g_new0(GAChannel, 1); |
| 296 | c->event_cb = cb; |
| 297 | c->user_data = opaque; |
| 298 | |
| 299 | if (!ga_channel_open(c, path, method, listen_fd, &err)) { |
| 300 | g_critical("%s", error_get_pretty(err)); |
| 301 | error_free(err); |
| 302 | ga_channel_free(c); |
| 303 | return NULL; |
| 304 | } |
| 305 | |
| 306 | return c; |
| 307 | } |
| 308 | |
| 309 | void ga_channel_free(GAChannel *c) |
| 310 | { |
| 311 | if (c->listen_channel) { |
| 312 | ga_channel_listen_close(c); |
| 313 | } |
| 314 | if (c->client_channel) { |
| 315 | ga_channel_client_close(c); |
| 316 | } |
| 317 | g_free(c); |
| 318 | } |