Holger Hans Peter Freyther | 7728820 | 2011-05-31 21:19:22 +0200 | [diff] [blame] | 1 | /* |
| 2 | * osmo-pcap-client code |
| 3 | * |
| 4 | * (C) 2011 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 5 | * (C) 2011 by On-Waves |
| 6 | * All Rights Reserved |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU Affero General Public License as published by |
| 10 | * the Free Software Foundation; either version 3 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU Affero General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Affero General Public License |
| 19 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <osmo-pcap/osmo_pcap_client.h> |
| 24 | #include <osmo-pcap/common.h> |
| 25 | #include <osmo-pcap/wireformat.h> |
| 26 | |
| 27 | #include <osmocom/core/msgb.h> |
| 28 | #include <osmocom/core/select.h> |
| 29 | #include <osmocom/core/socket.h> |
| 30 | |
| 31 | #include <arpa/inet.h> |
Holger Hans Peter Freyther | ddc698f | 2016-04-24 11:09:13 +0200 | [diff] [blame] | 32 | #include <netinet/in.h> |
Holger Hans Peter Freyther | 7728820 | 2011-05-31 21:19:22 +0200 | [diff] [blame] | 33 | |
| 34 | #include <sys/types.h> |
| 35 | #include <sys/socket.h> |
| 36 | |
| 37 | #include <limits.h> |
| 38 | #include <string.h> |
| 39 | #include <unistd.h> |
| 40 | |
| 41 | static void _osmo_client_connect(void *_data) |
| 42 | { |
| 43 | osmo_client_connect((struct osmo_pcap_client *) _data); |
| 44 | } |
| 45 | |
| 46 | static void lost_connection(struct osmo_pcap_client *client) |
| 47 | { |
| 48 | if (client->wqueue.bfd.fd >= 0) { |
| 49 | osmo_fd_unregister(&client->wqueue.bfd); |
| 50 | close(client->wqueue.bfd.fd); |
| 51 | client->wqueue.bfd.fd = -1; |
| 52 | } |
| 53 | |
| 54 | |
| 55 | client->timer.cb = _osmo_client_connect; |
| 56 | client->timer.data = client; |
| 57 | osmo_timer_schedule(&client->timer, 2, 0); |
| 58 | } |
| 59 | |
| 60 | static void write_data(struct osmo_pcap_client *client, struct msgb *msg) |
| 61 | { |
| 62 | if (osmo_wqueue_enqueue(&client->wqueue, msg) != 0) { |
| 63 | LOGP(DCLIENT, LOGL_ERROR, "Failed to enqueue.\n"); |
| 64 | msgb_free(msg); |
| 65 | return; |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | static int read_cb(struct osmo_fd *fd) |
| 70 | { |
| 71 | char buf[4096]; |
| 72 | int rc; |
| 73 | |
| 74 | rc = read(fd->fd, buf, sizeof(buf)); |
| 75 | if (rc <= 0) { |
| 76 | struct osmo_pcap_client *client = fd->data; |
| 77 | LOGP(DCLIENT, LOGL_ERROR, "Lost connection on read.\n"); |
| 78 | lost_connection(client); |
| 79 | return -1; |
| 80 | } |
| 81 | |
| 82 | return 0; |
| 83 | } |
| 84 | |
| 85 | static int write_cb(struct osmo_fd *fd, struct msgb *msg) |
| 86 | { |
| 87 | int rc; |
| 88 | |
| 89 | rc = write(fd->fd, msg->data, msg->len); |
| 90 | if (rc < 0) { |
| 91 | struct osmo_pcap_client *client = fd->data; |
| 92 | LOGP(DCLIENT, LOGL_ERROR, "Lost connection on write.\n"); |
| 93 | lost_connection(client); |
| 94 | return -1; |
| 95 | } |
| 96 | |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | void osmo_client_send_data(struct osmo_pcap_client *client, |
| 101 | struct pcap_pkthdr *in_hdr, const uint8_t *data) |
| 102 | { |
| 103 | struct osmo_pcap_data *om_hdr; |
Holger Hans Peter Freyther | 66b80cc | 2015-12-03 22:13:38 +0100 | [diff] [blame] | 104 | struct osmo_pcap_pkthdr *hdr; |
Holger Hans Peter Freyther | 7728820 | 2011-05-31 21:19:22 +0200 | [diff] [blame] | 105 | struct msgb *msg; |
| 106 | |
Holger Hans Peter Freyther | 42421c4 | 2015-12-03 20:16:37 +0100 | [diff] [blame] | 107 | if (in_hdr->caplen > 9000) { |
| 108 | LOGP(DCLIENT, LOGL_ERROR, |
| 109 | "Capture len too big %zu\n", in_hdr->caplen); |
| 110 | return; |
| 111 | } |
| 112 | |
| 113 | msg = msgb_alloc(9000 + sizeof(*om_hdr) + sizeof(*hdr), "data-data"); |
Holger Hans Peter Freyther | 7728820 | 2011-05-31 21:19:22 +0200 | [diff] [blame] | 114 | if (!msg) { |
| 115 | LOGP(DCLIENT, LOGL_ERROR, "Failed to allocate.\n"); |
| 116 | return; |
| 117 | } |
| 118 | |
| 119 | om_hdr = (struct osmo_pcap_data *) msgb_put(msg, sizeof(*om_hdr)); |
| 120 | om_hdr->type = PKT_LINK_DATA; |
| 121 | |
| 122 | msg->l2h = msgb_put(msg, sizeof(*hdr)); |
Holger Hans Peter Freyther | 66b80cc | 2015-12-03 22:13:38 +0100 | [diff] [blame] | 123 | hdr = (struct osmo_pcap_pkthdr *) msg->l2h; |
| 124 | hdr->ts_sec = in_hdr->ts.tv_sec; |
| 125 | hdr->ts_usec = in_hdr->ts.tv_usec; |
| 126 | hdr->caplen = in_hdr->caplen; |
| 127 | hdr->len = in_hdr->len; |
Holger Hans Peter Freyther | 7728820 | 2011-05-31 21:19:22 +0200 | [diff] [blame] | 128 | |
| 129 | msg->l3h = msgb_put(msg, in_hdr->caplen); |
| 130 | memcpy(msg->l3h, data, in_hdr->caplen); |
| 131 | |
Holger Hans Peter Freyther | 9df7dc5 | 2011-06-01 17:29:15 +0200 | [diff] [blame] | 132 | om_hdr->len = htons(msgb_l2len(msg)); |
Holger Hans Peter Freyther | 7728820 | 2011-05-31 21:19:22 +0200 | [diff] [blame] | 133 | |
| 134 | write_data(client, msg); |
| 135 | } |
| 136 | |
| 137 | void osmo_client_send_link(struct osmo_pcap_client *client) |
| 138 | { |
| 139 | struct pcap_file_header *hdr; |
| 140 | struct osmo_pcap_data *om_hdr; |
Holger Hans Peter Freyther | 42421c4 | 2015-12-03 20:16:37 +0100 | [diff] [blame] | 141 | struct msgb *msg; |
Holger Hans Peter Freyther | 7728820 | 2011-05-31 21:19:22 +0200 | [diff] [blame] | 142 | |
Holger Hans Peter Freyther | 42421c4 | 2015-12-03 20:16:37 +0100 | [diff] [blame] | 143 | msg = msgb_alloc(9000 + sizeof(*om_hdr) + sizeof(*hdr), "link-data"); |
Holger Hans Peter Freyther | 7728820 | 2011-05-31 21:19:22 +0200 | [diff] [blame] | 144 | if (!msg) { |
| 145 | LOGP(DCLIENT, LOGL_ERROR, "Failed to allocate data.\n"); |
| 146 | return; |
| 147 | } |
| 148 | |
| 149 | |
| 150 | om_hdr = (struct osmo_pcap_data *) msgb_put(msg, sizeof(*om_hdr)); |
| 151 | om_hdr->type = PKT_LINK_HDR; |
Holger Hans Peter Freyther | 9df7dc5 | 2011-06-01 17:29:15 +0200 | [diff] [blame] | 152 | om_hdr->len = htons(sizeof(*hdr)); |
Holger Hans Peter Freyther | 7728820 | 2011-05-31 21:19:22 +0200 | [diff] [blame] | 153 | |
| 154 | hdr = (struct pcap_file_header *) msgb_put(msg, sizeof(*hdr)); |
| 155 | hdr->magic = 0xa1b2c3d4; |
| 156 | hdr->version_major = 2; |
| 157 | hdr->version_minor = 4; |
| 158 | hdr->thiszone = 0; |
| 159 | hdr->sigfigs = 0; |
| 160 | hdr->snaplen = UINT_MAX; |
| 161 | hdr->linktype = pcap_datalink(client->handle); |
| 162 | |
| 163 | write_data(client, msg); |
| 164 | } |
| 165 | |
| 166 | void osmo_client_connect(struct osmo_pcap_client *client) |
| 167 | { |
| 168 | int fd; |
| 169 | |
| 170 | client->wqueue.read_cb = read_cb; |
| 171 | client->wqueue.write_cb = write_cb; |
| 172 | client->wqueue.bfd.when = BSC_FD_READ; |
| 173 | client->wqueue.bfd.data = client; |
| 174 | osmo_wqueue_clear(&client->wqueue); |
| 175 | |
| 176 | fd = osmo_sock_init(AF_INET, SOCK_STREAM, IPPROTO_TCP, |
Daniel Willmann | b000368 | 2011-07-17 17:48:19 +0200 | [diff] [blame] | 177 | client->srv_ip, client->srv_port, OSMO_SOCK_F_CONNECT); |
Holger Hans Peter Freyther | 7728820 | 2011-05-31 21:19:22 +0200 | [diff] [blame] | 178 | if (fd < 0) { |
| 179 | LOGP(DCLIENT, LOGL_ERROR, |
| 180 | "Failed to connect to %s:%d\n", |
| 181 | client->srv_ip, client->srv_port); |
| 182 | lost_connection(client); |
| 183 | return; |
| 184 | } |
| 185 | |
| 186 | client->wqueue.bfd.fd = fd; |
| 187 | if (osmo_fd_register(&client->wqueue.bfd) != 0) { |
| 188 | LOGP(DCLIENT, LOGL_ERROR, |
| 189 | "Failed to register to BFD.\n"); |
| 190 | lost_connection(client); |
| 191 | return; |
| 192 | } |
| 193 | |
| 194 | osmo_client_send_link(client); |
| 195 | } |