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Defined sk_close() which closes the socket safely even if called from

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socket hook. Replaces the SK_DELETED hack.

Squashed a couple of bugs in handling of TCP sockets.
This commit is contained in:
Martin Mares 2000-03-30 10:43:37 +00:00
parent 3a6337ecb2
commit 320f417357
3 changed files with 47 additions and 20 deletions
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4
lib/socket.h
View File

@ -38,10 +38,12 @@ typedef struct birdsock {
int fd; /* System-dependent data */
node n;
int entered;
} sock;
sock *sk_new(pool *); /* Allocate new socket */
int sk_open(sock *); /* Open socket */
void sk_close(sock *); /* Safe close of socket even from socket hook */
int sk_send(sock *, unsigned len); /* Send data, <0=err, >0=ok, 0=sleep */
int sk_send_to(sock *, unsigned len, ip_addr to, unsigned port); /* sk_send to given destination */
void sk_dump_all(void);
@ -66,7 +68,7 @@ sk_send_buffer_empty(sock *sk)
#define SK_MAGIC 7 /* Internal use by sysdep code */
#define SK_UNIX_PASSIVE 8
#define SK_UNIX 9
#define SK_DELETED 10 /* Set to this if you want to delete socket from err_hook */
#define SK_DELETED 10 /* Internal use by sk_close */
/*
* Multicast sockets are slightly different from the other ones:

61
sysdep/unix/io.c
View File

@ -336,7 +336,10 @@ sk_free(resource *r)
sock *s = (sock *) r;
if (s->fd >= 0)
rem_node(&s->n);
{
close(s->fd);
rem_node(&s->n);
}
}
static void
@ -382,6 +385,7 @@ sk_new(pool *p)
s->tbsize = 0;
s->err_hook = NULL;
s->fd = -1;
s->entered = 0;
return s;
}
@ -477,9 +481,9 @@ sk_alloc_bufs(sock *s)
static void
sk_tcp_connected(sock *s)
{
s->rx_hook(s, 0);
s->type = SK_TCP;
sk_alloc_bufs(s);
s->tx_hook(s);
}
static int
@ -524,6 +528,8 @@ sk_open(sock *s)
switch (type)
{
case SK_TCP_ACTIVE:
s->ttx = ""; /* Force s->ttx != s->tpos */
/* Fall thru */
case SK_TCP_PASSIVE:
fd = socket(BIRD_PF, SOCK_STREAM, IPPROTO_TCP);
break;
@ -625,6 +631,7 @@ sk_open(sock *s)
case SK_MAGIC:
break;
default:
sk_alloc_bufs(s);
#ifdef IPV6
#ifdef IPV6_MTU_DISCOVER
{
@ -644,7 +651,6 @@ sk_open(sock *s)
#endif
}
sk_alloc_bufs(s);
add_tail(&sock_list, &s->n);
return 0;
@ -686,6 +692,15 @@ bad:
return -1;
}
void
sk_close(sock *s)
{
if (s->entered)
s->type = SK_DELETED;
else
rfree(s);
}
static int
sk_maybe_write(sock *s)
{
@ -767,19 +782,6 @@ sk_read(sock *s)
{
switch (s->type)
{
case SK_TCP_ACTIVE:
{
sockaddr sa;
fill_in_sockaddr(&sa, s->daddr, s->dport);
if (connect(s->fd, (struct sockaddr *) &sa, sizeof(sa)) >= 0)
sk_tcp_connected(s);
else if (errno != EINTR && errno != EAGAIN && errno != EINPROGRESS)
{
log(L_ERR "connect: %m");
s->err_hook(s, errno);
}
return 0;
}
case SK_TCP_PASSIVE:
{
sockaddr sa;
@ -816,6 +818,8 @@ sk_read(sock *s)
}
case SK_MAGIC:
return s->rx_hook(s, 0);
case SK_DELETED:
return 0;
default:
{
sockaddr sa;
@ -842,8 +846,27 @@ sk_read(sock *s)
static void
sk_write(sock *s)
{
while (s->ttx != s->tbuf && sk_maybe_write(s) > 0)
s->tx_hook(s);
switch (s->type)
{
case SK_TCP_ACTIVE:
{
sockaddr sa;
fill_in_sockaddr(&sa, s->daddr, s->dport);
if (connect(s->fd, (struct sockaddr *) &sa, sizeof(sa)) >= 0)
sk_tcp_connected(s);
else if (errno != EINTR && errno != EAGAIN && errno != EINPROGRESS)
{
log(L_ERR "connect: %m");
s->err_hook(s, errno);
}
break;
}
case SK_DELETED:
return;
default:
while (s->ttx != s->tbuf && sk_maybe_write(s) > 0)
s->tx_hook(s);
}
}
void
@ -965,6 +988,7 @@ io_loop(void)
WALK_LIST_DELSAFE(n, p, sock_list)
{
s = SKIP_BACK(sock, n, n);
s->entered = 1;
if (FD_ISSET(s->fd, &rd))
{
FD_CLR(s->fd, &rd);
@ -976,6 +1000,7 @@ io_loop(void)
FD_CLR(s->fd, &wr);
sk_write(s);
}
s->entered = 0;
if (s->type == SK_DELETED)
rfree(s);
}

2
sysdep/unix/main.c
View File

@ -236,8 +236,8 @@ cli_err(sock *s, int err)
log(L_INFO "CLI connection dropped: %s", strerror(err));
else
log(L_INFO "CLI connection closed");
s->type = SK_DELETED;
cli_free(s->data);
sk_close(s);
}
static int