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Add and document support for a FETCH_BIND_ADDRESS environment variable

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specifying a local address to bind sockets to.  Caveat: lightly tested.

PR:		bin/37572
This commit is contained in:
Dag-Erling Smørgrav 2003-03-03 12:35:03 +00:00
parent 7ac40f5f59
commit c42cb9d906
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=111816
3 changed files with 37 additions and 4 deletions
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35
lib/libfetch/common.c
View File

@ -226,6 +226,28 @@ _fetch_ref(conn_t *conn)
}
/*
* Bind a socket to a specific local address
*/
int
_fetch_bind(int sd, int af, const char *addr)
{
struct addrinfo hints, *res, *res0;
int err;
memset(&hints, 0, sizeof(hints));
hints.ai_family = af;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = 0;
if ((err = getaddrinfo(addr, NULL, &hints, &res0)) != 0)
return (-1);
for (res = res0; res; res = res->ai_next)
if (bind(sd, res->ai_addr, res->ai_addrlen) == 0)
return (0);
return (-1);
}
/*
* Establish a TCP connection to the specified port on the specified host.
*/
@ -234,6 +256,7 @@ _fetch_connect(const char *host, int port, int af, int verbose)
{
conn_t *conn;
char pbuf[10];
const char *bindaddr;
struct addrinfo hints, *res, *res0;
int sd, err;
@ -252,19 +275,25 @@ _fetch_connect(const char *host, int port, int af, int verbose)
_netdb_seterr(err);
return (NULL);
}
bindaddr = getenv("FETCH_BIND_ADDRESS");
if (verbose)
_fetch_info("connecting to %s:%d", host, port);
/* try to connect */
for (sd = -1, res = res0; res; res = res->ai_next) {
for (sd = -1, res = res0; res; sd = -1, res = res->ai_next) {
if ((sd = socket(res->ai_family, res->ai_socktype,
res->ai_protocol)) == -1)
continue;
if (connect(sd, res->ai_addr, res->ai_addrlen) != -1)
if (bindaddr != NULL && *bindaddr != '\0' &&
_fetch_bind(sd, res->ai_family, bindaddr) != 0) {
_fetch_info("failed to bind to '%s'", bindaddr);
close(sd);
continue;
}
if (connect(sd, res->ai_addr, res->ai_addrlen) == 0)
break;
close(sd);
sd = -1;
}
freeaddrinfo(res0);
if (sd == -1) {

1
lib/libfetch/common.h
View File

@ -76,6 +76,7 @@ void _fetch_syserr(void);
void _fetch_info(const char *, ...);
int _fetch_default_port(const char *);
int _fetch_default_proxy_port(const char *);
int _fetch_bind(int, int, const char *);
conn_t *_fetch_connect(const char *, int, int, int);
conn_t *_fetch_reopen(int);
conn_t *_fetch_ref(conn_t *);

5
lib/libfetch/fetch.3
View File

@ -444,7 +444,10 @@ Invalid URL
The accompanying error message includes a protocol-specific error code
and message, e.g. "File is not available (404 Not Found)"
.Sh ENVIRONMENT
.Bl -tag -width FTP_PASSIVE_MODE
.Bl -tag -width FETCH_BIND_ADDRESS
.It Ev FETCH_BIND_ADDRESS
Specifies a hostname or IP address to which sockets used for outgoing
connections will be bound.
.It Ev FTP_LOGIN
Default FTP login if none was provided in the URL.
.It Ev FTP_PASSIVE_MODE