src/common/sessiond-comm/sessiond-comm.c

   1 /*
   2  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
   3  *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License, version 2 only,
   7  * as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #define _GNU_SOURCE
  20 #include <assert.h>
  21 #include <limits.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <sys/stat.h>
  26 #include <sys/types.h>
  27 #include <unistd.h>
  28 #include <errno.h>
  29
  30 #include <common/common.h>
  31
  32 #include "sessiond-comm.h"
  33
  34 /* For Unix socket */
  35 #include "unix.h"
  36 /* For Inet socket */
  37 #include "inet.h"
  38 /* For Inet6 socket */
  39 #include "inet6.h"
  40
  41 static struct lttcomm_net_family net_families[] = {
  42         { LTTCOMM_INET, lttcomm_create_inet_sock },
  43         { LTTCOMM_INET6, lttcomm_create_inet6_sock },
  44 };
  45
  46 /*
  47  * Human readable error message.
  48  */
  49 static const char *lttcomm_readable_code[] = {
  50         [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) ] = "consumerd command socket ready",
  51         [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_SUCCESS_RECV_FD) ] = "consumerd success on receiving fds",
  52         [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_ERROR_RECV_FD) ] = "consumerd error on receiving fds",
  53         [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_ERROR_RECV_CMD) ] = "consumerd error on receiving command",
  54         [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_POLL_ERROR) ] = "consumerd error in polling thread",
  55         [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_POLL_NVAL) ] = "consumerd polling on closed fd",
  56         [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_POLL_HUP) ] = "consumerd all fd hung up",
  57         [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_EXIT_SUCCESS) ] = "consumerd exiting normally",
  58         [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_EXIT_FAILURE) ] = "consumerd exiting on error",
  59         [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_OUTFD_ERROR) ] = "consumerd error opening the tracefile",
  60         [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_SPLICE_EBADF) ] = "consumerd splice EBADF",
  61         [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_SPLICE_EINVAL) ] = "consumerd splice EINVAL",
  62         [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_SPLICE_ENOMEM) ] = "consumerd splice ENOMEM",
  63         [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_SPLICE_ESPIPE) ] = "consumerd splice ESPIPE",
  64
  65         /* Last element */
  66         [ LTTCOMM_ERR_INDEX(LTTCOMM_NR) ] = "Unknown error code"
  67 };
  68
  69 /*
  70  * Return ptr to string representing a human readable error code from the
  71  * lttcomm_return_code enum.
  72  *
  73  * These code MUST be negative in other to treat that as an error value.
  74  */
  75 LTTNG_HIDDEN
  76 const char *lttcomm_get_readable_code(enum lttcomm_return_code code)
  77 {
  78         code = -code;
  79
  80         if (code < LTTCOMM_CONSUMERD_COMMAND_SOCK_READY || code > LTTCOMM_NR) {
  81                 code = LTTCOMM_NR;
  82         }
  83
  84         return lttcomm_readable_code[LTTCOMM_ERR_INDEX(code)];
  85 }
  86
  87 /*
  88  * Create socket from an already allocated lttcomm socket structure and init
  89  * sockaddr in the lttcomm sock.
  90  */
  91 LTTNG_HIDDEN
  92 int lttcomm_create_sock(struct lttcomm_sock *sock)
  93 {
  94         int ret, _sock_type, _sock_proto, domain;
  95
  96         assert(sock);
  97
  98         domain = sock->sockaddr.type;
  99         if (domain != LTTCOMM_INET && domain != LTTCOMM_INET6) {
 100                 ERR("Create socket of unknown domain %d", domain);
 101                 ret = -1;
 102                 goto error;
 103         }
 104
 105         switch (sock->proto) {
 106         case LTTCOMM_SOCK_UDP:
 107                 _sock_type = SOCK_DGRAM;
 108                 _sock_proto = IPPROTO_UDP;
 109                 break;
 110         case LTTCOMM_SOCK_TCP:
 111                 _sock_type = SOCK_STREAM;
 112                 _sock_proto = IPPROTO_TCP;
 113                 break;
 114         default:
 115                 ret = -1;
 116                 goto error;
 117         }
 118
 119         ret = net_families[domain].create(sock, _sock_type, _sock_proto);
 120         if (ret < 0) {
 121                 goto error;
 122         }
 123
 124 error:
 125         return ret;
 126 }
 127
 128 /*
 129  * Return allocated lttcomm socket structure.
 130  */
 131 LTTNG_HIDDEN
 132 struct lttcomm_sock *lttcomm_alloc_sock(enum lttcomm_sock_proto proto)
 133 {
 134         struct lttcomm_sock *sock;
 135
 136         sock = zmalloc(sizeof(struct lttcomm_sock));
 137         if (sock == NULL) {
 138                 PERROR("zmalloc create sock");
 139                 goto end;
 140         }
 141
 142         sock->proto = proto;
 143         sock->fd = -1;
 144
 145 end:
 146         return sock;
 147 }
 148
 149 /*
 150  * Return an allocated lttcomm socket structure and copy src content into
 151  * the newly created socket.
 152  *
 153  * This is mostly useful when lttcomm_sock are passed between process where the
 154  * fd and ops have to be changed within the correct address space.
 155  */
 156 LTTNG_HIDDEN
 157 struct lttcomm_sock *lttcomm_alloc_copy_sock(struct lttcomm_sock *src)
 158 {
 159         struct lttcomm_sock *sock;
 160
 161         /* Safety net */
 162         assert(src);
 163
 164         sock = lttcomm_alloc_sock(src->proto);
 165         if (sock == NULL) {
 166                 goto alloc_error;
 167         }
 168
 169         lttcomm_copy_sock(sock, src);
 170
 171 alloc_error:
 172         return sock;
 173 }
 174
 175 /*
 176  * Create and copy socket from an allocated lttcomm socket structure.
 177  *
 178  * This is mostly useful when lttcomm_sock are passed between process where the
 179  * fd and ops have to be changed within the correct address space.
 180  */
 181 LTTNG_HIDDEN
 182 void lttcomm_copy_sock(struct lttcomm_sock *dst, struct lttcomm_sock *src)
 183 {
 184         /* Safety net */
 185         assert(dst);
 186         assert(src);
 187
 188         dst->proto = src->proto;
 189         dst->fd = src->fd;
 190         dst->ops = src->ops;
 191         /* Copy sockaddr information from original socket */
 192         memcpy(&dst->sockaddr, &src->sockaddr, sizeof(dst->sockaddr));
 193 }
 194
 195 /*
 196  * Init IPv4 sockaddr structure.
 197  */
 198 LTTNG_HIDDEN
 199 int lttcomm_init_inet_sockaddr(struct lttcomm_sockaddr *sockaddr,
 200                 const char *ip, unsigned int port)
 201 {
 202         int ret;
 203
 204         assert(sockaddr);
 205         assert(ip);
 206         assert(port > 0 && port <= 65535);
 207
 208         memset(sockaddr, 0, sizeof(struct lttcomm_sockaddr));
 209
 210         sockaddr->type = LTTCOMM_INET;
 211         sockaddr->addr.sin.sin_family = AF_INET;
 212         sockaddr->addr.sin.sin_port = htons(port);
 213         ret = inet_pton(sockaddr->addr.sin.sin_family, ip,
 214                         &sockaddr->addr.sin.sin_addr);
 215         if (ret < 1) {
 216                 ret = -1;
 217                 ERR("%s with port %d: unrecognized IPv4 address", ip, port);
 218                 goto error;
 219         }
 220         memset(sockaddr->addr.sin.sin_zero, 0, sizeof(sockaddr->addr.sin.sin_zero));
 221
 222 error:
 223         return ret;
 224 }
 225
 226 /*
 227  * Init IPv6 sockaddr structure.
 228  */
 229 LTTNG_HIDDEN
 230 int lttcomm_init_inet6_sockaddr(struct lttcomm_sockaddr *sockaddr,
 231                 const char *ip, unsigned int port)
 232 {
 233         int ret;
 234
 235         assert(sockaddr);
 236         assert(ip);
 237         assert(port > 0 && port <= 65535);
 238
 239         memset(sockaddr, 0, sizeof(struct lttcomm_sockaddr));
 240
 241         sockaddr->type = LTTCOMM_INET6;
 242         sockaddr->addr.sin6.sin6_family = AF_INET6;
 243         sockaddr->addr.sin6.sin6_port = htons(port);
 244         ret = inet_pton(sockaddr->addr.sin6.sin6_family, ip,
 245                         &sockaddr->addr.sin6.sin6_addr);
 246         if (ret < 1) {
 247                 ret = -1;
 248                 goto error;
 249         }
 250
 251 error:
 252         return ret;
 253 }
 254
 255 /*
 256  * Return allocated lttcomm socket structure from lttng URI.
 257  */
 258 LTTNG_HIDDEN
 259 struct lttcomm_sock *lttcomm_alloc_sock_from_uri(struct lttng_uri *uri)
 260 {
 261         int ret;
 262         int _sock_proto;
 263         struct lttcomm_sock *sock = NULL;
 264
 265         /* Safety net */
 266         assert(uri);
 267
 268         /* Check URI protocol */
 269         if (uri->proto == LTTNG_TCP) {
 270                 _sock_proto = LTTCOMM_SOCK_TCP;
 271         } else {
 272                 ERR("Relayd invalid URI proto: %d", uri->proto);
 273                 goto alloc_error;
 274         }
 275
 276         sock = lttcomm_alloc_sock(_sock_proto);
 277         if (sock == NULL) {
 278                 goto alloc_error;
 279         }
 280
 281         /* Check destination type */
 282         if (uri->dtype == LTTNG_DST_IPV4) {
 283                 ret = lttcomm_init_inet_sockaddr(&sock->sockaddr, uri->dst.ipv4,
 284                                 uri->port);
 285                 if (ret < 0) {
 286                         goto error;
 287                 }
 288         } else if (uri->dtype == LTTNG_DST_IPV6) {
 289                 ret = lttcomm_init_inet6_sockaddr(&sock->sockaddr, uri->dst.ipv6,
 290                                 uri->port);
 291                 if (ret < 0) {
 292                         goto error;
 293                 }
 294         } else {
 295                 /* Command URI is invalid */
 296                 ERR("Relayd invalid URI dst type: %d", uri->dtype);
 297                 goto error;
 298         }
 299
 300         return sock;
 301
 302 error:
 303         lttcomm_destroy_sock(sock);
 304 alloc_error:
 305         return NULL;
 306 }
 307
 308 /*
 309  * Destroy and free lttcomm socket.
 310  */
 311 LTTNG_HIDDEN
 312 void lttcomm_destroy_sock(struct lttcomm_sock *sock)
 313 {
 314         free(sock);
 315 }
 316
 317 /*
 318  * Allocate and return a relayd socket object using a given URI to initialize
 319  * it and the major/minor version of the supported protocol.
 320  *
 321  * On error, NULL is returned.
 322  */
 323 LTTNG_HIDDEN
 324 struct lttcomm_relayd_sock *lttcomm_alloc_relayd_sock(struct lttng_uri *uri,
 325                 uint32_t major, uint32_t minor)
 326 {
 327         int ret;
 328         struct lttcomm_sock *tmp_sock = NULL;
 329         struct lttcomm_relayd_sock *rsock = NULL;
 330
 331         assert(uri);
 332
 333         rsock = zmalloc(sizeof(*rsock));
 334         if (!rsock) {
 335                 PERROR("zmalloc relayd sock");
 336                 goto error;
 337         }
 338
 339         /* Allocate socket object from URI */
 340         tmp_sock = lttcomm_alloc_sock_from_uri(uri);
 341         if (tmp_sock == NULL) {
 342                 goto error_free;
 343         }
 344
 345         /*
 346          * Create socket object which basically sets the ops according to the
 347          * socket protocol.
 348          */
 349         lttcomm_copy_sock(&rsock->sock, tmp_sock);
 350         /* Temporary socket pointer not needed anymore. */
 351         lttcomm_destroy_sock(tmp_sock);
 352         ret = lttcomm_create_sock(&rsock->sock);
 353         if (ret < 0) {
 354                 goto error_free;
 355         }
 356
 357         rsock->major = major;
 358         rsock->minor = minor;
 359
 360         return rsock;
 361
 362 error_free:
 363         free(rsock);
 364 error:
 365         return NULL;
 366 }