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                 sscanf(buf, "eventid=%d", &eventid);
  63                 sscanf(buf, "result=%63s", result);
  64         }
  65         debugf(NHRP_DEBUG_EVENT, "evmgr: received: eventid=%d result=%s", eventid, result);
  66         if (eventid && result[0]) {
  67                 struct nhrp_reqid *r = nhrp_reqid_lookup(&nhrp_event_reqid, eventid);
  68                 if (r) r->cb(r, result);
  69         }
  70 }
  71
  72 static int evmgr_read(struct thread *t)
  73 {
  74         struct event_manager *evmgr = THREAD_ARG(t);
  75         struct zbuf *ibuf = &evmgr->ibuf;
  76         struct zbuf msg;
  77
  78         evmgr->t_read = NULL;
  79         if (zbuf_read(ibuf, evmgr->fd, (size_t) -1) < 0) {
  80                 evmgr_connection_error(evmgr);
  81                 return 0;
  82         }
  83
  84         /* Process all messages in buffer */
  85         while (zbuf_may_pull_until(ibuf, "\n\n", &msg))
  86                 evmgr_recv_message(evmgr, &msg);
  87
  88         thread_add_read(master, evmgr_read, evmgr, evmgr->fd, &evmgr->t_read);
  89         return 0;
  90 }
  91
  92 static int evmgr_write(struct thread *t)
  93 {
  94         struct event_manager *evmgr = THREAD_ARG(t);
  95         int r;
  96
  97         evmgr->t_write = NULL;
  98         r = zbufq_write(&evmgr->obuf, evmgr->fd);
  99         if (r > 0) {
 100                 thread_add_write(master, evmgr_write, evmgr, evmgr->fd,
 101                                  &evmgr->t_write);
 102         } else if (r < 0) {
 103                 evmgr_connection_error(evmgr);
 104         }
 105
 106         return 0;
 107 }
 108
 109 static void evmgr_hexdump(struct zbuf *zb, const uint8_t *val, size_t vallen)
 110 {
 111         static const char xd[] = "0123456789abcdef";
 112         size_t i;
 113         char *ptr;
 114
 115         ptr  = zbuf_pushn(zb, 2*vallen);
 116         if (!ptr) return;
 117
 118         for (i = 0; i < vallen; i++) {
 119                 uint8_t b = val[i];
 120                 *(ptr++) = xd[b >> 4];
 121                 *(ptr++) = xd[b & 0xf];
 122         }
 123 }
 124
 125 static void evmgr_put(struct zbuf *zb, const char *fmt, ...)
 126 {
 127         const char *pos, *nxt, *str;
 128         const uint8_t *bin;
 129         const union sockunion *su;
 130         int len;
 131         va_list va;
 132
 133         va_start(va, fmt);
 134         for (pos = fmt; (nxt = strchr(pos, '%')) != NULL; pos = nxt + 2) {
 135                 zbuf_put(zb, pos, nxt-pos);
 136                 switch (nxt[1]) {
 137                 case '%':
 138                         zbuf_put8(zb, '%');
 139                         break;
 140                 case 'u':
 141                         zb->tail += snprintf((char *) zb->tail, zbuf_tailroom(zb), "%u", va_arg(va, uint32_t));
 142                         break;
 143                 case 's':
 144                         str = va_arg(va, const char *);
 145                         zbuf_put(zb, str, strlen(str));
 146                         break;
 147                 case 'U':
 148                         su = va_arg(va, const union sockunion *);
 149                         if (sockunion2str(su, (char *) zb->tail, zbuf_tailroom(zb)))
 150                                 zb->tail += strlen((char *) zb->tail);
 151                         else
 152                                 zbuf_set_werror(zb);
 153                         break;
 154                 case 'H':
 155                         bin = va_arg(va, const uint8_t *);
 156                         len = va_arg(va, int);
 157                         evmgr_hexdump(zb, bin, len);
 158                         break;
 159                 }
 160         }
 161         va_end(va);
 162         zbuf_put(zb, pos, strlen(pos));
 163 }
 164
 165 static void evmgr_submit(struct event_manager *evmgr, struct zbuf *obuf)
 166 {
 167         if (obuf->error) {
 168                 zbuf_free(obuf);
 169                 return;
 170         }
 171         zbuf_put(obuf, "\n", 1);
 172         zbufq_queue(&evmgr->obuf, obuf);
 173         if (evmgr->fd >= 0)
 174                 thread_add_write(master, evmgr_write, evmgr, evmgr->fd,
 175                                  &evmgr->t_write);
 176 }
 177
 178 static int evmgr_reconnect(struct thread *t)
 179 {
 180         struct event_manager *evmgr = THREAD_ARG(t);
 181         int fd;
 182
 183         evmgr->t_reconnect = NULL;
 184         if (evmgr->fd >= 0 || !nhrp_event_socket_path) return 0;
 185
 186         fd = sock_open_unix(nhrp_event_socket_path);
 187         if (fd < 0) {
 188                 zlog_warn("%s: failure connecting nhrp-event socket: %s",
 189                         __PRETTY_FUNCTION__, strerror(errno));
 190                 zbufq_reset(&evmgr->obuf);
 191                 thread_add_timer(master, evmgr_reconnect, evmgr, 10,
 192                                  &evmgr->t_reconnect);
 193                 return 0;
 194         }
 195
 196         zlog_info("Connected to Event Manager");
 197         evmgr->fd = fd;
 198         thread_add_read(master, evmgr_read, evmgr, evmgr->fd, &evmgr->t_read);
 199
 200         return 0;
 201 }
 202
 203 static struct event_manager evmgr_connection;
 204
 205 void evmgr_init(void)
 206 {
 207         struct event_manager *evmgr = &evmgr_connection;
 208
 209         evmgr->fd = -1;
 210         zbuf_init(&evmgr->ibuf, evmgr->ibuf_data, sizeof(evmgr->ibuf_data), 0);
 211         zbufq_init(&evmgr->obuf);
 212         thread_add_timer_msec(master, evmgr_reconnect, evmgr, 10,
 213                               &evmgr->t_reconnect);
 214 }
 215
 216 void evmgr_set_socket(const char *socket)
 217 {
 218         if (nhrp_event_socket_path) {
 219                 free((char *) nhrp_event_socket_path);
 220                 nhrp_event_socket_path = NULL;
 221         }
 222         if (socket)
 223                 nhrp_event_socket_path = strdup(socket);
 224         evmgr_connection_error(&evmgr_connection);
 225 }
 226
 227 void evmgr_terminate(void)
 228 {
 229 }
 230
 231 void evmgr_notify(const char *name, struct nhrp_cache *c, void (*cb)(struct nhrp_reqid *, void *))
 232 {
 233         struct event_manager *evmgr = &evmgr_connection;
 234         struct nhrp_vc *vc;
 235         struct nhrp_interface *nifp = c->ifp->info;
 236         struct zbuf *zb;
 237         afi_t afi = family2afi(sockunion_family(&c->remote_addr));
 238
 239         if (!nhrp_event_socket_path) {
 240                 cb(&c->eventid, (void*) "accept");
 241                 return;
 242         }
 243
 244         debugf(NHRP_DEBUG_EVENT, "evmgr: sending event %s", name);
 245
 246         vc = c->new.peer ? c->new.peer->vc : NULL;
 247         zb = zbuf_alloc(1024 + (vc ? (vc->local.certlen + vc->remote.certlen) * 2 : 0));
 248
 249         if (cb) {
 250                 nhrp_reqid_free(&nhrp_event_reqid, &c->eventid);
 251                 evmgr_put(zb,
 252                         "eventid=%u\n",
 253                         nhrp_reqid_alloc(&nhrp_event_reqid, &c->eventid, cb));
 254         }
 255
 256         evmgr_put(zb,
 257                 "event=%s\n"
 258                 "type=%s\n"
 259                 "old_type=%s\n"
 260                 "num_nhs=%u\n"
 261                 "interface=%s\n"
 262                 "local_addr=%U\n",
 263                 name,
 264                 nhrp_cache_type_str[c->new.type],
 265                 nhrp_cache_type_str[c->cur.type],
 266                 (unsigned int) nhrp_cache_counts[NHRP_CACHE_NHS],
 267                 c->ifp->name,
 268                 &nifp->afi[afi].addr);
 269
 270         if (vc) {
 271                 evmgr_put(zb,
 272                         "vc_initiated=%s\n"
 273                         "local_nbma=%U\n"
 274                         "local_cert=%H\n"
 275                         "remote_addr=%U\n"
 276                         "remote_nbma=%U\n"
 277                         "remote_cert=%H\n",
 278                         c->new.peer->requested ? "yes" : "no",
 279                         &vc->local.nbma,
 280                         vc->local.cert, vc->local.certlen,
 281                         &c->remote_addr, &vc->remote.nbma,
 282                         vc->remote.cert, vc->remote.certlen);
 283         }
 284
 285         evmgr_submit(evmgr, zb);
 286 }
 287