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Try all addresses returned by getaddrinfo() until we find one that socket() is happy with

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Someone reported being unable to connect with the error "Address family not
supported", which is probably being returned by socket().  It is likely a
system where getaddrinfo() is returning AF_INET6 addresses, but socket()
won't create AF_INET6 sockets.

To handle this case, we loop over all the addresses returned by getaddrinfo()
until we find one that socket() will accept.
This commit is contained in:
Kevin Easton
2016-03-08 23:53:16 +11:00
parent c2a2d68d8d
commit 9427b3db84
2 changed files with 40 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
Changelog
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@@ -1,5 +1,8 @@
[Changes 1.2.2]
* If we can't create a socket for the first address returned by getaddrinfo(),
try the other returned addresses. (caf)
* Only show version once with -v option (reported by cpet). (caf)
* Drop group privileges before droppping user privileges when execing. (caf)

34
source/network.c
View File

@@ -509,13 +509,14 @@ int BX_connect_by_number(char *hostn, unsigned short *portnum, int service, int
{
struct sockaddr_foobar server;
socklen_t server_len;
struct hostent *hp;
#ifdef WINNT
char buf[BIG_BUFFER_SIZE+1];
#endif
#ifdef IPV6
struct addrinfo hints, *res;
struct addrinfo hints = { 0 };
struct addrinfo *res_list, *res;
#else
struct hostent *hp;
struct sockaddr_in localaddr;
if (LocalHostName)
{
@@ -532,18 +533,29 @@ int BX_connect_by_number(char *hostn, unsigned short *portnum, int service, int
#ifndef WINNT
#ifdef IPV6
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_flags = AI_ADDRCONFIG;
hints.ai_socktype = proto_type;
if (!getaddrinfo(hostn, NULL, &hints, &res) && res)
{
close(fd);
if (getaddrinfo(hostn, NULL, &hints, &res_list) != 0)
return close(fd), -6;
if ((fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol)) < 0)
close(fd);
fd = -1;
for (res = res_list; res; res = res->ai_next)
{
fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (fd >= 0)
break;
}
if (fd < 0)
{
freeaddrinfo(res_list);
return -1;
set_socket_options (fd);
}
set_socket_options(fd);
memcpy(&server, res->ai_addr, res->ai_addrlen);
server_len = res->ai_addrlen;
@@ -551,7 +563,7 @@ int BX_connect_by_number(char *hostn, unsigned short *portnum, int service, int
memset(&hints, 0, sizeof hints);
hints.ai_family = res->ai_family;
freeaddrinfo(res);
freeaddrinfo(res_list);
if (LocalHostName && !getaddrinfo(LocalHostName, NULL, &hints, &res) && res)
{
@@ -561,10 +573,6 @@ int BX_connect_by_number(char *hostn, unsigned short *portnum, int service, int
if (retval)
return close(fd), -2;
}
}
else
return close(fd), -6;
#else
if (isdigit((unsigned char)hostn[strlen(hostn)-1]))
inet_aton(hostn, (struct in_addr *)&server.sf_addr);