nhrpd/nhrp_event.c

   1 /* NHRP event manager
   2  * Copyright (c) 2014-2015 Timo Teräs
   3  *
   4  * This file is free software: you may copy, redistribute and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  */
   9
  10 #include <string.h>
  11 #include <sys/socket.h>
  12 #include <sys/un.h>
  13
  14 #include "thread.h"
  15 #include "zbuf.h"
  16 #include "log.h"
  17 #include "nhrpd.h"
  18
  19 const char *nhrp_event_socket_path;
  20 struct nhrp_reqid_pool nhrp_event_reqid;
  21
  22 struct event_manager {
  23         struct thread *t_reconnect, *t_read, *t_write;
  24         struct zbuf ibuf;
  25         struct zbuf_queue obuf;
  26         int fd;
  27         uint8_t ibuf_data[4 * 1024];
  28 };
  29
  30 static int evmgr_reconnect(struct thread *t);
  31
  32 static void evmgr_connection_error(struct event_manager *evmgr)
  33 {
  34         THREAD_OFF(evmgr->t_read);
  35         THREAD_OFF(evmgr->t_write);
  36         zbuf_reset(&evmgr->ibuf);
  37         zbufq_reset(&evmgr->obuf);
  38
  39         if (evmgr->fd >= 0)
  40                 close(evmgr->fd);
  41         evmgr->fd = -1;
  42         if (nhrp_event_socket_path)
  43                 thread_add_timer_msec(master, evmgr_reconnect, evmgr, 10,
  44                                       &evmgr->t_reconnect);
  45 }
  46
  47 static void evmgr_recv_message(struct event_manager *evmgr, struct zbuf *zb)
  48 {
  49         struct zbuf zl;
  50         uint32_t eventid = 0;
  51         size_t len;
  52         char buf[256], result[64] = "";
  53
  54         while (zbuf_may_pull_until(zb, "\n", &zl)) {
  55                 len = zbuf_used(&zl) - 1;
  56                 if (len >= sizeof(buf) - 1)
  57                         continue;
  58                 memcpy(buf, zbuf_pulln(&zl, len), len);
  59                 buf[len] = 0;
  60
  61                 debugf(NHRP_DEBUG_EVENT, "evmgr: msg: %s", buf);
  62                 if (sscanf(buf, "eventid=%" SCNu32, &eventid) != 1)
  63                         continue;
  64                 if (sscanf(buf, "result=%63s", result) != 1)
  65                         continue;
  66         }
  67         debugf(NHRP_DEBUG_EVENT, "evmgr: received: eventid=%d result=%s",
  68                eventid, result);
  69         if (eventid && result[0]) {
  70                 struct nhrp_reqid *r =
  71                         nhrp_reqid_lookup(&nhrp_event_reqid, eventid);
  72                 if (r)
  73                         r->cb(r, result);
  74         }
  75 }
  76
  77 static int evmgr_read(struct thread *t)
  78 {
  79         struct event_manager *evmgr = THREAD_ARG(t);
  80         struct zbuf *ibuf = &evmgr->ibuf;
  81         struct zbuf msg;
  82
  83         evmgr->t_read = NULL;
  84         if (zbuf_read(ibuf, evmgr->fd, (size_t)-1) < 0) {
  85                 evmgr_connection_error(evmgr);
  86                 return 0;
  87         }
  88
  89         /* Process all messages in buffer */
  90         while (zbuf_may_pull_until(ibuf, "\n\n", &msg))
  91                 evmgr_recv_message(evmgr, &msg);
  92
  93         thread_add_read(master, evmgr_read, evmgr, evmgr->fd, &evmgr->t_read);
  94         return 0;
  95 }
  96
  97 static int evmgr_write(struct thread *t)
  98 {
  99         struct event_manager *evmgr = THREAD_ARG(t);
 100         int r;
 101
 102         evmgr->t_write = NULL;
 103         r = zbufq_write(&evmgr->obuf, evmgr->fd);
 104         if (r > 0) {
 105                 thread_add_write(master, evmgr_write, evmgr, evmgr->fd,
 106                                  &evmgr->t_write);
 107         } else if (r < 0) {
 108                 evmgr_connection_error(evmgr);
 109         }
 110
 111         return 0;
 112 }
 113
 114 static void evmgr_hexdump(struct zbuf *zb, const uint8_t *val, size_t vallen)
 115 {
 116         static const char xd[] = "0123456789abcdef";
 117         size_t i;
 118         char *ptr;
 119
 120         ptr = zbuf_pushn(zb, 2 * vallen);
 121         if (!ptr)
 122                 return;
 123
 124         for (i = 0; i < vallen; i++) {
 125                 uint8_t b = val[i];
 126                 *(ptr++) = xd[b >> 4];
 127                 *(ptr++) = xd[b & 0xf];
 128         }
 129 }
 130
 131 static void evmgr_put(struct zbuf *zb, const char *fmt, ...)
 132 {
 133         const char *pos, *nxt, *str;
 134         const uint8_t *bin;
 135         const union sockunion *su;
 136         int len;
 137         va_list va;
 138
 139         va_start(va, fmt);
 140         for (pos = fmt; (nxt = strchr(pos, '%')) != NULL; pos = nxt + 2) {
 141                 zbuf_put(zb, pos, nxt - pos);
 142                 switch (nxt[1]) {
 143                 case '%':
 144                         zbuf_put8(zb, '%');
 145                         break;
 146                 case 'u':
 147                         zb->tail +=
 148                                 snprintf((char *)zb->tail, zbuf_tailroom(zb),
 149                                          "%u", va_arg(va, uint32_t));
 150                         break;
 151                 case 's':
 152                         str = va_arg(va, const char *);
 153                         zbuf_put(zb, str, strlen(str));
 154                         break;
 155                 case 'U':
 156                         su = va_arg(va, const union sockunion *);
 157                         if (sockunion2str(su, (char *)zb->tail,
 158                                           zbuf_tailroom(zb)))
 159                                 zb->tail += strlen((char *)zb->tail);
 160                         else
 161                                 zbuf_set_werror(zb);
 162                         break;
 163                 case 'H':
 164                         bin = va_arg(va, const uint8_t *);
 165                         len = va_arg(va, int);
 166                         evmgr_hexdump(zb, bin, len);
 167                         break;
 168                 }
 169         }
 170         va_end(va);
 171         zbuf_put(zb, pos, strlen(pos));
 172 }
 173
 174 static void evmgr_submit(struct event_manager *evmgr, struct zbuf *obuf)
 175 {
 176         if (obuf->error) {
 177                 zbuf_free(obuf);
 178                 return;
 179         }
 180         zbuf_put(obuf, "\n", 1);
 181         zbufq_queue(&evmgr->obuf, obuf);
 182         if (evmgr->fd >= 0)
 183                 thread_add_write(master, evmgr_write, evmgr, evmgr->fd,
 184                                  &evmgr->t_write);
 185 }
 186
 187 static int evmgr_reconnect(struct thread *t)
 188 {
 189         struct event_manager *evmgr = THREAD_ARG(t);
 190         int fd;
 191
 192         evmgr->t_reconnect = NULL;
 193         if (evmgr->fd >= 0 || !nhrp_event_socket_path)
 194                 return 0;
 195
 196         fd = sock_open_unix(nhrp_event_socket_path);
 197         if (fd < 0) {
 198                 zlog_warn("%s: failure connecting nhrp-event socket: %s",
 199                           __PRETTY_FUNCTION__, strerror(errno));
 200                 zbufq_reset(&evmgr->obuf);
 201                 thread_add_timer(master, evmgr_reconnect, evmgr, 10,
 202                                  &evmgr->t_reconnect);
 203                 return 0;
 204         }
 205
 206         zlog_info("Connected to Event Manager");
 207         evmgr->fd = fd;
 208         thread_add_read(master, evmgr_read, evmgr, evmgr->fd, &evmgr->t_read);
 209
 210         return 0;
 211 }
 212
 213 static struct event_manager evmgr_connection;
 214
 215 void evmgr_init(void)
 216 {
 217         struct event_manager *evmgr = &evmgr_connection;
 218
 219         evmgr->fd = -1;
 220         zbuf_init(&evmgr->ibuf, evmgr->ibuf_data, sizeof(evmgr->ibuf_data), 0);
 221         zbufq_init(&evmgr->obuf);
 222         thread_add_timer_msec(master, evmgr_reconnect, evmgr, 10,
 223                               &evmgr->t_reconnect);
 224 }
 225
 226 void evmgr_set_socket(const char *socket)
 227 {
 228         if (nhrp_event_socket_path) {
 229                 free((char *)nhrp_event_socket_path);
 230                 nhrp_event_socket_path = NULL;
 231         }
 232         if (socket)
 233                 nhrp_event_socket_path = strdup(socket);
 234         evmgr_connection_error(&evmgr_connection);
 235 }
 236
 237 void evmgr_terminate(void)
 238 {
 239 }
 240
 241 void evmgr_notify(const char *name, struct nhrp_cache *c,
 242                   void (*cb)(struct nhrp_reqid *, void *))
 243 {
 244         struct event_manager *evmgr = &evmgr_connection;
 245         struct nhrp_vc *vc;
 246         struct nhrp_interface *nifp = c->ifp->info;
 247         struct zbuf *zb;
 248         afi_t afi = family2afi(sockunion_family(&c->remote_addr));
 249
 250         if (!nhrp_event_socket_path) {
 251                 cb(&c->eventid, (void *)"accept");
 252                 return;
 253         }
 254
 255         debugf(NHRP_DEBUG_EVENT, "evmgr: sending event %s", name);
 256
 257         vc = c->new.peer ? c->new.peer->vc : NULL;
 258         zb = zbuf_alloc(
 259                 1024 + (vc ? (vc->local.certlen + vc->remote.certlen) * 2 : 0));
 260
 261         if (cb) {
 262                 nhrp_reqid_free(&nhrp_event_reqid, &c->eventid);
 263                 evmgr_put(zb, "eventid=%u\n",
 264                           nhrp_reqid_alloc(&nhrp_event_reqid, &c->eventid, cb));
 265         }
 266
 267         evmgr_put(zb,
 268                   "event=%s\n"
 269                   "type=%s\n"
 270                   "old_type=%s\n"
 271                   "num_nhs=%u\n"
 272                   "interface=%s\n"
 273                   "local_addr=%U\n",
 274                   name, nhrp_cache_type_str[c->new.type],
 275                   nhrp_cache_type_str[c->cur.type],
 276                   (unsigned int)nhrp_cache_counts[NHRP_CACHE_NHS], c->ifp->name,
 277                   &nifp->afi[afi].addr);
 278
 279         if (vc) {
 280                 evmgr_put(zb,
 281                           "vc_initiated=%s\n"
 282                           "local_nbma=%U\n"
 283                           "local_cert=%H\n"
 284                           "remote_addr=%U\n"
 285                           "remote_nbma=%U\n"
 286                           "remote_cert=%H\n",
 287                           c->new.peer->requested ? "yes" : "no",
 288                           &vc->local.nbma, vc->local.cert, vc->local.certlen,
 289                           &c->remote_addr, &vc->remote.nbma, vc->remote.cert,
 290                           vc->remote.certlen);
 291         }
 292
 293         evmgr_submit(evmgr, zb);
 294 }