ifconfig-ipv6(-push): allow using hostnames
PATCH 1/1 ifconfig-ipv6(-push): allow using hostnames
Similarly to ifconfig(-push), its IPv6 counterpart is now able to accept hostnames as well instead of IP addresses in numeric form.
Basically this means that the user is now allowed to specify something like this:
ifconfig-ipv6-push my.hostname.cx/64
This is exactly the same behaviour that we already have with ifconfig(-push).
The generic code introduced in this patch will be later used to implement the /bits parsing support for IPv4 addresses.
Trac: #808
Signed-off-by Antonio Quartulli <[email protected]...>
--- src/openvpn/options.c | 61 ------------------------ src/openvpn/options.h | 4 -- src/openvpn/socket.c | 126 +++++++++++++++++++++++++++++++++++++++++++++----- src/openvpn/socket.h | 12 +++++ 4 files changed, 126 insertions(+), 77 deletions(-)
src/openvpn/options.c +0 -61
@@ -1026,67 +1026,6 @@ get_ip_addr(const char *ip_string, int msglevel, bool *error)return ret; } -/* helper: parse a text string containing an IPv6 address + netbits -* in "standard format" (2001:dba::/32) -* "/nn" is optional, default to /64 if missing -* -* return true if parsing succeeded, modify *network and *netbits -*/ -bool -get_ipv6_addr (const char *prefix_str,struct in6_addr *network, -unsigned int *netbits,int msglevel) -{ -char *sep, *endp; -int bits; -struct in6_addr t_network; - - sep =strchr ( prefix_str,'/' ); -if (sep ==NULL ) - { - bits =64 ; - } -else - { - bits =strtol ( sep+1 , &endp,10 ); -if (*endp !='\0' || bits <0 || bits >128 ) - { -msg (msglevel,"IPv6 prefix '%s': invalid '/bits' spec" , prefix_str); -return false; - } - } - -/* temporary replace '/' in caller-provided string with '\0', otherwise -* inet_pton() will refuse prefix string -* (alternative would be to strncpy() the prefix to temporary buffer) -*/ - -if (sep !=NULL ) - { - *sep ='\0' ; - } - -if (inet_pton (AF_INET6 , prefix_str, &t_network ) !=1 ) - { -msg (msglevel,"IPv6 prefix '%s': invalid IPv6 address" , prefix_str); -return false; - } - -if (sep !=NULL ) - { - *sep ='/' ; - } - -if (netbits !=NULL ) - { - *netbits = bits; - } -if (network !=NULL ) - { - *network = t_network; - } -return true;/* parsing OK, values set */ -} -/** * Returns newly allocated string containing address part without "/nn". *
src/openvpn/options.h +0 -4
@@ -811,8 +811,4 @@ void options_string_import(struct options *options,unsigned int *option_types_found, struct env_set *es); -bool get_ipv6_addr (const char *prefix_str,struct in6_addr *network, -unsigned int *netbits,int msglevel ); - -#endif /* ifndef OPTIONS_H */
src/openvpn/socket.c +114 -12
152 lines not on this page · raw message
src/openvpn/socket.h +12 -0
@@ -533,12 +533,24 @@ bool unix_socket_get_peer_uid_gid(const socket_descriptor_t sd, int *uid, int *g#define GETADDR_CACHE_MASK (GETADDR_DATAGRAM|GETADDR_PASSIVE) +/** +* Translate an IPv4 addr or hostname from string form to in_addr_t +* +* In case of resolve error, it will try again for +* resolve_retry_seconds seconds. +*/ in_addr_t getaddr (unsigned int flags,const char *hostname,int resolve_retry_seconds,bool *succeeded,volatile int *signal_received); +/** +* Translate an IPv6 addr or hostname from string form to in6_addr +*/ +bool get_ipv6_addr (const char *hostname,struct in6_addr *network, +unsigned int *netbits,int msglevel); + int openvpn_getaddrinfo(unsigned int flags, const char *hostname, const char *servname,
Signature · 1 line
2.11.1
Quoted 88 lines · Antonio Quartulli
src/openvpn/socket.c +80
-0@@ -75,12 +75,102 @@ sf2gaf(const unsigned int getaddr_flags,/* * Functions related to the translation of DNS names to IP addresses. */ +static int +get_addr_generic (sa_family_t af,unsigned int flags,const char *hostname, +void *network,unsigned int *netbits, +int resolve_retry_seconds,volatile int *signal_received, +int msglevel) +{ +char *endp, *sep, *var_host; +uint8_t bits, max_bits; +struct addrinfo *ai; +int ret =-1 ; + +ASSERT (hostname); + +/* assign family specific default values */ +switch (af) + { +case AF_INET : + bits =0 ; + max_bits =sizeof (in_addr_t) *8 ; +break ; +case AF_INET6 : + bits =64 ; + max_bits =sizeof (struct in6_addr ) *8 ; +break ; +default : +ASSERT (0 ); + } + +/* we need to modify the hostname received as input, but we don't want to +* touch it directly as it might be a constant string. +* +* Therefore, we clone the string here and free it at the end of the +* function */ + var_host =strdup (hostname); +ASSERT (var_host); + +/* check if this hostname has a /bits suffix */ + sep =strchr (var_host ,'/' ); +if (sep) + { + bits =strtoul (sep +1 , &endp,10 ); +if ((*endp !='\0' ) || (bits > max_bits)) + { +msg (msglevel,"IP prefix '%s': invalid '/bits' spec" , hostname); + goto out; + } +/* temporary truncate string at '/'. This allows the IP +* parsing routines to properly work. Will be restored later. +*/ + *sep ='\0' ; + } + + ret =openvpn_getaddrinfo (flags & ~GETADDR_HOST_ORDER , var_host,NULL , + resolve_retry_seconds, signal_received, af, &ai); +if ((ret ==0 ) && network) + { +struct in6_addr *ip6; +in_addr_t *ip4; + +switch (af) + { +case AF_INET : + ip4 = network; + *ip4 = ((struct sockaddr_in *)ai->ai_addr)->sin_addr.s_addr; + +if (flags &GETADDR_HOST_ORDER ) + { + *ip4 =ntohl (*ip4); + } +break ; +case AF_INET6 : + ip6 = network; + *ip6 = ((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr; +break ; +default : +ASSERT (0 ); + } +freeaddrinfo (ai); + } +
src/openvpn/socket.c sf2gaf(const unsigned int getaddr_flags, · line 167
Quoted 10 lines
src/openvpn/socket.c +10
-0+if (netbits) + { + *netbits = bits; + } + +/* restore '/' separator, if any */ +if (sep) + { + *sep ='/' ; + }
Actually this part is useless. sep points somewhere inside var_host, but var_host is going to be free'd at the next line, therefore the block above can be removed.
Cheers,
Signature · 1 line
Antonio Quartulli