1 #include "qemu/osdep.h" 2 #include <termios.h> 3 #include "qapi/error.h" 4 #include "qemu/sockets.h" 5 #include "channel.h" 6 7 #ifdef CONFIG_SOLARIS 8 #include <stropts.h> 9 #endif 10 11 #define GA_CHANNEL_BAUDRATE_DEFAULT B38400 /* for isa-serial channels */ 12 13 struct GAChannel { 14 GIOChannel *listen_channel; 15 GIOChannel *client_channel; 16 GAChannelMethod method; 17 GAChannelCallback event_cb; 18 gpointer user_data; 19 }; 20 21 static int ga_channel_client_add(GAChannel *c, int fd); 22 23 static gboolean ga_channel_listen_accept(GIOChannel *channel, 24 GIOCondition condition, gpointer data) 25 { 26 GAChannel *c = data; 27 int ret, client_fd; 28 bool accepted = false; 29 30 g_assert(channel != NULL); 31 32 client_fd = qemu_accept(g_io_channel_unix_get_fd(channel), NULL, NULL); 33 if (client_fd == -1) { 34 g_warning("error converting fd to gsocket: %s", strerror(errno)); 35 goto out; 36 } 37 qemu_set_nonblock(client_fd); 38 ret = ga_channel_client_add(c, client_fd); 39 if (ret) { 40 g_warning("error setting up connection"); 41 close(client_fd); 42 goto out; 43 } 44 accepted = true; 45 46 out: 47 /* only accept 1 connection at a time */ 48 return !accepted; 49 } 50 51 /* start polling for readable events on listen fd, new==true 52 * indicates we should use the existing s->listen_channel 53 */ 54 static void ga_channel_listen_add(GAChannel *c, int listen_fd, bool create) 55 { 56 if (create) { 57 c->listen_channel = g_io_channel_unix_new(listen_fd); 58 } 59 g_io_add_watch(c->listen_channel, G_IO_IN, ga_channel_listen_accept, c); 60 } 61 62 static void ga_channel_listen_close(GAChannel *c) 63 { 64 g_assert(c->listen_channel); 65 g_io_channel_shutdown(c->listen_channel, true, NULL); 66 g_io_channel_unref(c->listen_channel); 67 c->listen_channel = NULL; 68 } 69 70 /* cleanup state for closed connection/session, start accepting new 71 * connections if we're in listening mode 72 */ 73 static void ga_channel_client_close(GAChannel *c) 74 { 75 g_assert(c->client_channel); 76 g_io_channel_shutdown(c->client_channel, true, NULL); 77 g_io_channel_unref(c->client_channel); 78 c->client_channel = NULL; 79 if (c->listen_channel) { 80 ga_channel_listen_add(c, 0, false); 81 } 82 } 83 84 static gboolean ga_channel_client_event(GIOChannel *channel, 85 GIOCondition condition, gpointer data) 86 { 87 GAChannel *c = data; 88 gboolean client_cont; 89 90 g_assert(c); 91 if (c->event_cb) { 92 client_cont = c->event_cb(condition, c->user_data); 93 if (!client_cont) { 94 ga_channel_client_close(c); 95 return false; 96 } 97 } 98 return true; 99 } 100 101 static int ga_channel_client_add(GAChannel *c, int fd) 102 { 103 GIOChannel *client_channel; 104 GError *err = NULL; 105 106 g_assert(c && !c->client_channel); 107 client_channel = g_io_channel_unix_new(fd); 108 g_assert(client_channel); 109 g_io_channel_set_encoding(client_channel, NULL, &err); 110 if (err != NULL) { 111 g_warning("error setting channel encoding to binary"); 112 g_error_free(err); 113 return -1; 114 } 115 g_io_add_watch(client_channel, G_IO_IN | G_IO_HUP, 116 ga_channel_client_event, c); 117 c->client_channel = client_channel; 118 return 0; 119 } 120 121 static gboolean ga_channel_open(GAChannel *c, const gchar *path, 122 GAChannelMethod method, int fd) 123 { 124 int ret; 125 c->method = method; 126 127 switch (c->method) { 128 case GA_CHANNEL_VIRTIO_SERIAL: { 129 assert(fd < 0); 130 fd = qemu_open(path, O_RDWR | O_NONBLOCK 131 #ifndef CONFIG_SOLARIS 132 | O_ASYNC 133 #endif 134 ); 135 if (fd == -1) { 136 g_critical("error opening channel: %s", strerror(errno)); 137 return false; 138 } 139 #ifdef CONFIG_SOLARIS 140 ret = ioctl(fd, I_SETSIG, S_OUTPUT | S_INPUT | S_HIPRI); 141 if (ret == -1) { 142 g_critical("error setting event mask for channel: %s", 143 strerror(errno)); 144 close(fd); 145 return false; 146 } 147 #endif 148 ret = ga_channel_client_add(c, fd); 149 if (ret) { 150 g_critical("error adding channel to main loop"); 151 close(fd); 152 return false; 153 } 154 break; 155 } 156 case GA_CHANNEL_ISA_SERIAL: { 157 struct termios tio; 158 159 assert(fd < 0); 160 fd = qemu_open(path, O_RDWR | O_NOCTTY | O_NONBLOCK); 161 if (fd == -1) { 162 g_critical("error opening channel: %s", strerror(errno)); 163 return false; 164 } 165 tcgetattr(fd, &tio); 166 /* set up serial port for non-canonical, dumb byte streaming */ 167 tio.c_iflag &= ~(IGNBRK | BRKINT | IGNPAR | PARMRK | INPCK | ISTRIP | 168 INLCR | IGNCR | ICRNL | IXON | IXOFF | IXANY | 169 IMAXBEL); 170 tio.c_oflag = 0; 171 tio.c_lflag = 0; 172 tio.c_cflag |= GA_CHANNEL_BAUDRATE_DEFAULT; 173 /* 1 available byte min or reads will block (we'll set non-blocking 174 * elsewhere, else we have to deal with read()=0 instead) 175 */ 176 tio.c_cc[VMIN] = 1; 177 tio.c_cc[VTIME] = 0; 178 /* flush everything waiting for read/xmit, it's garbage at this point */ 179 tcflush(fd, TCIFLUSH); 180 tcsetattr(fd, TCSANOW, &tio); 181 ret = ga_channel_client_add(c, fd); 182 if (ret) { 183 g_critical("error adding channel to main loop"); 184 close(fd); 185 return false; 186 } 187 break; 188 } 189 case GA_CHANNEL_UNIX_LISTEN: { 190 if (fd < 0) { 191 Error *local_err = NULL; 192 193 fd = unix_listen(path, &local_err); 194 if (local_err != NULL) { 195 g_critical("%s", error_get_pretty(local_err)); 196 error_free(local_err); 197 return false; 198 } 199 } 200 ga_channel_listen_add(c, fd, true); 201 break; 202 } 203 case GA_CHANNEL_VSOCK_LISTEN: { 204 if (fd < 0) { 205 Error *local_err = NULL; 206 SocketAddress *addr; 207 char *addr_str; 208 209 addr_str = g_strdup_printf("vsock:%s", path); 210 addr = socket_parse(addr_str, &local_err); 211 g_free(addr_str); 212 if (local_err != NULL) { 213 g_critical("%s", error_get_pretty(local_err)); 214 error_free(local_err); 215 return false; 216 } 217 218 fd = socket_listen(addr, &local_err); 219 qapi_free_SocketAddress(addr); 220 if (local_err != NULL) { 221 g_critical("%s", error_get_pretty(local_err)); 222 error_free(local_err); 223 return false; 224 } 225 } 226 ga_channel_listen_add(c, fd, true); 227 break; 228 } 229 default: 230 g_critical("error binding/listening to specified socket"); 231 return false; 232 } 233 234 return true; 235 } 236 237 GIOStatus ga_channel_write_all(GAChannel *c, const gchar *buf, gsize size) 238 { 239 GError *err = NULL; 240 gsize written = 0; 241 GIOStatus status = G_IO_STATUS_NORMAL; 242 243 while (size) { 244 g_debug("sending data, count: %d", (int)size); 245 status = g_io_channel_write_chars(c->client_channel, buf, size, 246 &written, &err); 247 if (status == G_IO_STATUS_NORMAL) { 248 size -= written; 249 buf += written; 250 } else if (status != G_IO_STATUS_AGAIN) { 251 g_warning("error writing to channel: %s", err->message); 252 return status; 253 } 254 } 255 256 do { 257 status = g_io_channel_flush(c->client_channel, &err); 258 } while (status == G_IO_STATUS_AGAIN); 259 260 if (status != G_IO_STATUS_NORMAL) { 261 g_warning("error flushing channel: %s", err->message); 262 } 263 264 return status; 265 } 266 267 GIOStatus ga_channel_read(GAChannel *c, gchar *buf, gsize size, gsize *count) 268 { 269 return g_io_channel_read_chars(c->client_channel, buf, size, count, NULL); 270 } 271 272 GAChannel *ga_channel_new(GAChannelMethod method, const gchar *path, 273 int listen_fd, GAChannelCallback cb, gpointer opaque) 274 { 275 GAChannel *c = g_new0(GAChannel, 1); 276 c->event_cb = cb; 277 c->user_data = opaque; 278 279 if (!ga_channel_open(c, path, method, listen_fd)) { 280 g_critical("error opening channel"); 281 ga_channel_free(c); 282 return NULL; 283 } 284 285 return c; 286 } 287 288 void ga_channel_free(GAChannel *c) 289 { 290 if (c->listen_channel) { 291 ga_channel_listen_close(c); 292 } 293 if (c->client_channel) { 294 ga_channel_client_close(c); 295 } 296 g_free(c); 297 } 298