| 1 | /* |
| 2 | * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License, version 2 only, as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., 51 |
| 15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #define _GNU_SOURCE |
| 19 | #include <stdio.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <string.h> |
| 22 | #include <sys/stat.h> |
| 23 | #include <unistd.h> |
| 24 | |
| 25 | #include <common/common.h> |
| 26 | #include <common/defaults.h> |
| 27 | #include <common/sessiond-comm/sessiond-comm.h> |
| 28 | |
| 29 | #include "kernel-consumer.h" |
| 30 | |
| 31 | /* |
| 32 | * Send all stream fds of kernel channel to the consumer. |
| 33 | */ |
| 34 | int kernel_consumer_send_channel_stream(struct consumer_data *consumer_data, |
| 35 | int sock, struct ltt_kernel_channel *channel, uid_t uid, gid_t gid) |
| 36 | { |
| 37 | int ret, count = 0; |
| 38 | struct ltt_kernel_stream *stream; |
| 39 | struct lttcomm_consumer_msg lkm; |
| 40 | |
| 41 | DBG("Sending streams of channel %s to kernel consumer", |
| 42 | channel->channel->name); |
| 43 | |
| 44 | /* Send channel */ |
| 45 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; |
| 46 | lkm.u.channel.channel_key = channel->fd; |
| 47 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; |
| 48 | lkm.u.channel.mmap_len = 0; /* for kernel */ |
| 49 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
| 50 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
| 51 | if (ret < 0) { |
| 52 | PERROR("send consumer channel"); |
| 53 | goto error; |
| 54 | } |
| 55 | |
| 56 | /* Send streams */ |
| 57 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
| 58 | if (!stream->fd) { |
| 59 | continue; |
| 60 | } |
| 61 | /* Reset consumer message structure */ |
| 62 | memset(&lkm, 0, sizeof(lkm)); |
| 63 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; |
| 64 | lkm.u.stream.channel_key = channel->fd; |
| 65 | lkm.u.stream.stream_key = stream->fd; |
| 66 | lkm.u.stream.state = stream->state; |
| 67 | lkm.u.stream.output = channel->channel->attr.output; |
| 68 | lkm.u.stream.mmap_len = 0; /* for kernel */ |
| 69 | lkm.u.stream.uid = uid; |
| 70 | lkm.u.stream.gid = gid; |
| 71 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); |
| 72 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; |
| 73 | count++; |
| 74 | |
| 75 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); |
| 76 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
| 77 | if (ret < 0) { |
| 78 | PERROR("send consumer stream"); |
| 79 | goto error; |
| 80 | } |
| 81 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); |
| 82 | if (ret < 0) { |
| 83 | PERROR("send consumer stream ancillary data"); |
| 84 | goto error; |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | DBG("consumer channel streams sent"); |
| 89 | |
| 90 | return 0; |
| 91 | |
| 92 | error: |
| 93 | return ret; |
| 94 | } |
| 95 | |
| 96 | /* |
| 97 | * Send all stream fds of the kernel session to the consumer. |
| 98 | */ |
| 99 | int kernel_consumer_send_session(struct consumer_data *consumer_data, |
| 100 | struct ltt_kernel_session *session) |
| 101 | { |
| 102 | int ret; |
| 103 | struct ltt_kernel_channel *chan; |
| 104 | struct lttcomm_consumer_msg lkm; |
| 105 | int sock = session->consumer_fd; |
| 106 | |
| 107 | DBG("Sending metadata stream fd"); |
| 108 | |
| 109 | /* Extra protection. It's NOT supposed to be set to -1 at this point */ |
| 110 | if (session->consumer_fd < 0) { |
| 111 | session->consumer_fd = consumer_data->cmd_sock; |
| 112 | } |
| 113 | |
| 114 | if (session->metadata_stream_fd >= 0) { |
| 115 | /* Send metadata channel fd */ |
| 116 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; |
| 117 | lkm.u.channel.channel_key = session->metadata->fd; |
| 118 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; |
| 119 | lkm.u.channel.mmap_len = 0; /* for kernel */ |
| 120 | DBG("Sending metadata channel %d to consumer", lkm.u.channel.channel_key); |
| 121 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
| 122 | if (ret < 0) { |
| 123 | PERROR("send consumer channel"); |
| 124 | goto error; |
| 125 | } |
| 126 | |
| 127 | /* Send metadata stream fd */ |
| 128 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; |
| 129 | lkm.u.stream.channel_key = session->metadata->fd; |
| 130 | lkm.u.stream.stream_key = session->metadata_stream_fd; |
| 131 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; |
| 132 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
| 133 | lkm.u.stream.mmap_len = 0; /* for kernel */ |
| 134 | lkm.u.stream.uid = session->uid; |
| 135 | lkm.u.stream.gid = session->gid; |
| 136 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, |
| 137 | PATH_MAX - 1); |
| 138 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; |
| 139 | |
| 140 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); |
| 141 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
| 142 | if (ret < 0) { |
| 143 | PERROR("send consumer stream"); |
| 144 | goto error; |
| 145 | } |
| 146 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); |
| 147 | if (ret < 0) { |
| 148 | PERROR("send consumer stream"); |
| 149 | goto error; |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
| 154 | ret = kernel_consumer_send_channel_stream(consumer_data, sock, chan, |
| 155 | session->uid, session->gid); |
| 156 | if (ret < 0) { |
| 157 | goto error; |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | DBG("consumer fds (metadata and channel streams) sent"); |
| 162 | |
| 163 | return 0; |
| 164 | |
| 165 | error: |
| 166 | return ret; |
| 167 | } |
| 168 | |