IABSD.fr/src/usr.sbin/switchd/imsg_util.c

Branch : - branch - master - tag -

• Show log

  Commit

• Author : reyk
  Date : 2016-09-30 11:57:57
  Hash : 5c0cb926
  Message : Implement socket server code that properly handles async I/O, partial messages, multiple messages per buffer and important things like connection limits and file descriptor accounting. It works with TCP connections as well as switch(4). The ofrelay.c part replaces networking that was in ofp.c and will soon handle all socket connections of switchd. It is called "ofrelay" because it will be used as client, server, and forwarder. OK rzalamena@

• usr.sbin/switchd/imsg_util.c

• /*	$OpenBSD: imsg_util.c,v 1.5 2016/09/30 11:57:57 reyk Exp $	*/
  
  /*
   * Copyright (c) 2010-2016 Reyk Floeter <reyk@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <sys/queue.h>
  #include <sys/socket.h>
  #include <sys/uio.h>
  
  #include <net/if.h>
  #include <netinet/in_systm.h>
  #include <netinet/in.h>
  #include <netinet/ip.h>
  #include <netinet/tcp.h>
  #include <arpa/inet.h>
  #include <netdb.h>
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include <string.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <ctype.h>
  #include <event.h>
  #include <imsg.h>
  
  #include "switchd.h"
  
  /*
   * Extending the imsg buffer API for internal use
   */
  
  int
  ibuf_cat(struct ibuf *dst, struct ibuf *src)
  {
  	return (ibuf_add(dst, src->buf, ibuf_size(src)));
  }
  
  void
  ibuf_zero(struct ibuf *buf)
  {
  	explicit_bzero(buf->buf, buf->wpos);
  }
  
  void
  ibuf_reset(struct ibuf *buf)
  {
  	ibuf_zero(buf);
  	buf->rpos = buf->wpos = 0;
  }
  
  struct ibuf *
  ibuf_new(void *data, size_t len)
  {
  	struct ibuf	*buf;
  
  	if ((buf = ibuf_dynamic(len,
  	    SWITCHD_MSGBUF_MAX)) == NULL)
  		return (NULL);
  
  	ibuf_zero(buf);
  
  	if (data == NULL && len) {
  		if (ibuf_advance(buf, len) == NULL) {
  			ibuf_free(buf);
  			return (NULL);
  		}
  	} else {
  		if (ibuf_add(buf, data, len) != 0) {
  			ibuf_free(buf);
  			return (NULL);
  		}
  	}
  
  	return (buf);
  }
  
  struct ibuf *
  ibuf_static(void)
  {
  	struct ibuf	*buf;
  
  	if ((buf = ibuf_open(SWITCHD_MSGBUF_MAX)) == NULL)
  		return (NULL);
  
  	ibuf_zero(buf);
  
  	return (buf);
  }
  
  void *
  ibuf_advance(struct ibuf *buf, size_t len)
  {
  	void	*ptr;
  
  	if ((ptr = ibuf_reserve(buf, len)) != NULL)
  		memset(ptr, 0, len);
  
  	return (ptr);
  }
  
  void
  ibuf_release(struct ibuf *buf)
  {
  	if (buf == NULL)
  		return;
  	if (buf->buf != NULL) {
  		ibuf_zero(buf);
  		free(buf->buf);
  	}
  	free(buf);
  }
  
  size_t
  ibuf_length(struct ibuf *buf)
  {
  	if (buf == NULL || buf->buf == NULL)
  		return (0);
  	return (ibuf_size(buf));
  }
  
  uint8_t *
  ibuf_data(struct ibuf *buf)
  {
  	return (ibuf_seek(buf, 0, 0));
  }
  
  void *
  ibuf_getdata(struct ibuf *buf, size_t len)
  {
  	void	*data;
  
  	if ((data = ibuf_seek(buf, buf->rpos, len)) == NULL)
  		return (NULL);
  	buf->rpos += len;
  
  	return (data);
  }
  
  ssize_t
  ibuf_dataleft(struct ibuf *buf)
  {
  	return (buf->wpos - buf->rpos);
  }
  
  size_t
  ibuf_dataoffset(struct ibuf *buf)
  {
  	return (buf->rpos);
  }
  
  struct ibuf *
  ibuf_get(struct ibuf *buf, size_t len)
  {
  	void		*data;
  
  	if ((data = ibuf_getdata(buf, len)) == NULL)
  		return (NULL);
  
  	return (ibuf_new(data, len));
  }
  
  struct ibuf *
  ibuf_dup(struct ibuf *buf)
  {
  	if (buf == NULL)
  		return (NULL);
  	return (ibuf_new(ibuf_data(buf), ibuf_size(buf)));
  }
  
  struct ibuf *
  ibuf_random(size_t len)
  {
  	struct ibuf	*buf;
  	void		*ptr;
  
  	if ((buf = ibuf_open(len)) == NULL)
  		return (NULL);
  	if ((ptr = ibuf_reserve(buf, len)) == NULL) {
  		ibuf_free(buf);
  		return (NULL);
  	}
  	arc4random_buf(ptr, len);
  	return (buf);
  }
  
  int
  ibuf_setsize(struct ibuf *buf, size_t len)
  {
  	if (len > buf->size)
  		return (-1);
  	buf->wpos = len;
  	return (0);
  }
  
  int
  ibuf_setmax(struct ibuf *buf, size_t len)
  {
  	if (len > buf->size)
  		return (-1);
  	buf->max = len;
  	return (0);
  }
  
  int
  ibuf_prepend(struct ibuf *buf, void *data, size_t len)
  {
  	struct ibuf	*new;
  
  	/* Swap buffers (we could also use memmove here) */
  	if ((new = ibuf_new(data, len)) == NULL)
  		return (-1);
  	if (ibuf_cat(new, buf) == -1) {
  		ibuf_release(new);
  		return (-1);
  	}
  	free(buf->buf);
  	memcpy(buf, new, sizeof(*buf));
  	free(new);
  
  	return (0);
  }