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=%d", &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", eventid, result);
  68         if (eventid && result[0]) {
  69                 struct nhrp_reqid *r = nhrp_reqid_lookup(&nhrp_event_reqid, eventid);
  70                 if (r) r->cb(r, result);
  71         }
  72 }
  73
  74 static int evmgr_read(struct thread *t)
  75 {
  76         struct event_manager *evmgr = THREAD_ARG(t);
  77         struct zbuf *ibuf = &evmgr->ibuf;
  78         struct zbuf msg;
  79
  80         evmgr->t_read = NULL;
  81         if (zbuf_read(ibuf, evmgr->fd, (size_t) -1) < 0) {
  82                 evmgr_connection_error(evmgr);
  83                 return 0;
  84         }
  85
  86         /* Process all messages in buffer */
  87         while (zbuf_may_pull_until(ibuf, "\n\n", &msg))
  88                 evmgr_recv_message(evmgr, &msg);
  89
  90         thread_add_read(master, evmgr_read, evmgr, evmgr->fd, &evmgr->t_read);
  91         return 0;
  92 }
  93
  94 static int evmgr_write(struct thread *t)
  95 {
  96         struct event_manager *evmgr = THREAD_ARG(t);
  97         int r;
  98
  99         evmgr->t_write = NULL;
 100         r = zbufq_write(&evmgr->obuf, evmgr->fd);
 101         if (r > 0) {
 102                 thread_add_write(master, evmgr_write, evmgr, evmgr->fd,
 103                                  &evmgr->t_write);
 104         } else if (r < 0) {
 105                 evmgr_connection_error(evmgr);
 106         }
 107
 108         return 0;
 109 }
 110
 111 static void evmgr_hexdump(struct zbuf *zb, const uint8_t *val, size_t vallen)
 112 {
 113         static const char xd[] = "0123456789abcdef";
 114         size_t i;
 115         char *ptr;
 116
 117         ptr  = zbuf_pushn(zb, 2*vallen);
 118         if (!ptr) return;
 119
 120         for (i = 0; i < vallen; i++) {
 121                 uint8_t b = val[i];
 122                 *(ptr++) = xd[b >> 4];
 123                 *(ptr++) = xd[b & 0xf];
 124         }
 125 }
 126
 127 static void evmgr_put(struct zbuf *zb, const char *fmt, ...)
 128 {
 129         const char *pos, *nxt, *str;
 130         const uint8_t *bin;
 131         const union sockunion *su;
 132         int len;
 133         va_list va;
 134
 135         va_start(va, fmt);
 136         for (pos = fmt; (nxt = strchr(pos, '%')) != NULL; pos = nxt + 2) {
 137                 zbuf_put(zb, pos, nxt-pos);
 138                 switch (nxt[1]) {
 139                 case '%':
 140                         zbuf_put8(zb, '%');
 141                         break;
 142                 case 'u':
 143                         zb->tail += snprintf((char *) zb->tail, zbuf_tailroom(zb), "%u", va_arg(va, uint32_t));
 144                         break;
 145                 case 's':
 146                         str = va_arg(va, const char *);
 147                         zbuf_put(zb, str, strlen(str));
 148                         break;
 149                 case 'U':
 150                         su = va_arg(va, const union sockunion *);
 151                         if (sockunion2str(su, (char *) zb->tail, zbuf_tailroom(zb)))
 152                                 zb->tail += strlen((char *) zb->tail);
 153                         else
 154                                 zbuf_set_werror(zb);
 155                         break;
 156                 case 'H':
 157                         bin = va_arg(va, const uint8_t *);
 158                         len = va_arg(va, int);
 159                         evmgr_hexdump(zb, bin, len);
 160                         break;
 161                 }
 162         }
 163         va_end(va);
 164         zbuf_put(zb, pos, strlen(pos));
 165 }
 166
 167 static void evmgr_submit(struct event_manager *evmgr, struct zbuf *obuf)
 168 {
 169         if (obuf->error) {
 170                 zbuf_free(obuf);
 171                 return;
 172         }
 173         zbuf_put(obuf, "\n", 1);
 174         zbufq_queue(&evmgr->obuf, obuf);
 175         if (evmgr->fd >= 0)
 176                 thread_add_write(master, evmgr_write, evmgr, evmgr->fd,
 177                                  &evmgr->t_write);
 178 }
 179
 180 static int evmgr_reconnect(struct thread *t)
 181 {
 182         struct event_manager *evmgr = THREAD_ARG(t);
 183         int fd;
 184
 185         evmgr->t_reconnect = NULL;
 186         if (evmgr->fd >= 0 || !nhrp_event_socket_path) return 0;
 187
 188         fd = sock_open_unix(nhrp_event_socket_path);
 189         if (fd < 0) {
 190                 zlog_warn("%s: failure connecting nhrp-event socket: %s",
 191                         __PRETTY_FUNCTION__, strerror(errno));
 192                 zbufq_reset(&evmgr->obuf);
 193                 thread_add_timer(master, evmgr_reconnect, evmgr, 10,
 194                                  &evmgr->t_reconnect);
 195                 return 0;
 196         }
 197
 198         zlog_info("Connected to Event Manager");
 199         evmgr->fd = fd;
 200         thread_add_read(master, evmgr_read, evmgr, evmgr->fd, &evmgr->t_read);
 201
 202         return 0;
 203 }
 204
 205 static struct event_manager evmgr_connection;
 206
 207 void evmgr_init(void)
 208 {
 209         struct event_manager *evmgr = &evmgr_connection;
 210
 211         evmgr->fd = -1;
 212         zbuf_init(&evmgr->ibuf, evmgr->ibuf_data, sizeof(evmgr->ibuf_data), 0);
 213         zbufq_init(&evmgr->obuf);
 214         thread_add_timer_msec(master, evmgr_reconnect, evmgr, 10,
 215                               &evmgr->t_reconnect);
 216 }
 217
 218 void evmgr_set_socket(const char *socket)
 219 {
 220         if (nhrp_event_socket_path) {
 221                 free((char *) nhrp_event_socket_path);
 222                 nhrp_event_socket_path = NULL;
 223         }
 224         if (socket)
 225                 nhrp_event_socket_path = strdup(socket);
 226         evmgr_connection_error(&evmgr_connection);
 227 }
 228
 229 void evmgr_terminate(void)
 230 {
 231 }
 232
 233 void evmgr_notify(const char *name, struct nhrp_cache *c, void (*cb)(struct nhrp_reqid *, void *))
 234 {
 235         struct event_manager *evmgr = &evmgr_connection;
 236         struct nhrp_vc *vc;
 237         struct nhrp_interface *nifp = c->ifp->info;
 238         struct zbuf *zb;
 239         afi_t afi = family2afi(sockunion_family(&c->remote_addr));
 240
 241         if (!nhrp_event_socket_path) {
 242                 cb(&c->eventid, (void*) "accept");
 243                 return;
 244         }
 245
 246         debugf(NHRP_DEBUG_EVENT, "evmgr: sending event %s", name);
 247
 248         vc = c->new.peer ? c->new.peer->vc : NULL;
 249         zb = zbuf_alloc(1024 + (vc ? (vc->local.certlen + vc->remote.certlen) * 2 : 0));
 250
 251         if (cb) {
 252                 nhrp_reqid_free(&nhrp_event_reqid, &c->eventid);
 253                 evmgr_put(zb,
 254                         "eventid=%u\n",
 255                         nhrp_reqid_alloc(&nhrp_event_reqid, &c->eventid, cb));
 256         }
 257
 258         evmgr_put(zb,
 259                 "event=%s\n"
 260                 "type=%s\n"
 261                 "old_type=%s\n"
 262                 "num_nhs=%u\n"
 263                 "interface=%s\n"
 264                 "local_addr=%U\n",
 265                 name,
 266                 nhrp_cache_type_str[c->new.type],
 267                 nhrp_cache_type_str[c->cur.type],
 268                 (unsigned int) nhrp_cache_counts[NHRP_CACHE_NHS],
 269                 c->ifp->name,
 270                 &nifp->afi[afi].addr);
 271
 272         if (vc) {
 273                 evmgr_put(zb,
 274                         "vc_initiated=%s\n"
 275                         "local_nbma=%U\n"
 276                         "local_cert=%H\n"
 277                         "remote_addr=%U\n"
 278                         "remote_nbma=%U\n"
 279                         "remote_cert=%H\n",
 280                         c->new.peer->requested ? "yes" : "no",
 281                         &vc->local.nbma,
 282                         vc->local.cert, vc->local.certlen,
 283                         &c->remote_addr, &vc->remote.nbma,
 284                         vc->remote.cert, vc->remote.certlen);
 285         }
 286
 287         evmgr_submit(evmgr, zb);
 288 }
 289