Mnemonic: tools_static.c
Abstract: A small set of very simple tools to support Uta == RMR.
uta_tokenise -- simple string tokeniser
+ uta_rmip_tokenise -- tokenise and remove ip addresses from the list
uta_h2ip -- look up host name and return an ip address
uta_lookup_rtg -- looks in env for rtg host:port
uta_has_str -- searches buffer of tokens for a string
#include <sys/socket.h>
#include <netdb.h>
+// --- some protos needed for better organisation --------
+int is_this_myip( if_addrs_t* l, char* addr );
+
+
+// ----------------------------------------------------------------------------------
/*
Simple tokeniser. Split a null terminated string into tokens recording the
return n;
}
+/*
+ Tokenise and remove matches.
+ Given a buffer of 'sep' separated tokens, and a list of things,
+ return up to max tokens with any tokens that matched things in
+ the list. Toks is the user supplied array of char* which we will
+ fill in (up to max) with pointers to tokens from buf. This
+ damages buf, so the caller must dup the string if it must be
+ preserved for later, original, use. The pointers returned in
+ toks will reference portions of bufs.
+
+ Returns the number of tokens referenced by toks.
+*/
+static int uta_rmip_tokenise( char* buf, if_addrs_t* iplist, char** toks, int max, char sep ) {
+ int ntoks = 0; // total toks in the original buffer
+ int pcount = 0; // count after prune
+ char** all_toks;
+ int i;
+ int j;
+
+
+ all_toks = malloc( sizeof( char * ) * max ); // refernce to all tokens; we'll prune
+ pcount = ntoks = uta_tokenise( buf, all_toks, max, sep ); // split them up
+ j = 0;
+ if( ntoks > 0 ) {
+ for( i = 0; i < ntoks; i++ ) {
+ if( is_this_myip( iplist, all_toks[i] ) ) {
+ pcount--; // ours, prune
+ } else {
+ toks[j++] = all_toks[i]; // not one of ours, keep it
+ }
+ }
+ }
+
+ free( all_toks );
+ return pcount;
+}
+
/*
Xlate hostname (expected to be name:port) to an IP address that nano will tolerate.
We'll use the first address from the list to keep it simple. If the first character
hent = gethostbyname( dname );
if( hent == NULL || hent->h_addr_list == NULL ) {
- //fprintf( stderr, "[WARN] h2ip: dns lookup failed for: %s\n", dname );
+ //rmr_vlog( RMR_VL_WARN, "h2ip: dns lookup failed for: %s\n", dname );
free( dname );
return NULL;
}
that could be in the route table.
If the environment variable which limits the binding of our listen port
- to a single interface (ENV_BIND_IF) then ONLY that address is added to
- the list so that we don't pick up entries from the rtable that are for other
+ to a single interface (ENV_BIND_IF) then ONLY that interface/address is added
+ to the list so that we don't pick up entries from the rtable that are for other
processes listening on different interfaces.
+
+ The ENV_BIN_IF environment variable may be either an IP address (v6 must be in
+ square braces), or an interface name (e.g. eth0).
*/
if_addrs_t* mk_ip_list( char* port ) {
if_addrs_t* l;
char wbuf[NI_MAXHOST+128];
char* fmt;
char* envp; // at the environment var if there
-
+ char* target_if = NULL; // target interface supplied by ENV_BIND_IF
+ char* tok;
if( (l = (if_addrs_t *) malloc( sizeof( if_addrs_t ) )) == NULL ) {
}
if( (envp = getenv( ENV_BIND_IF )) != NULL ) {
- snprintf( wbuf, sizeof( wbuf ), "%s:%s", envp, port ); // smash port onto the addr as is
- l->addrs[l->naddrs] = strdup( wbuf );
- l->naddrs++;
- if( DEBUG ) fprintf( stderr, "[INFO] rmr: using only specific bind interface when searching specific RT entries: %s\n", wbuf );
- return l;
+ if( isdigit( *envp ) || *envp == '[' ) { // ip address given and not device name
+ snprintf( wbuf, sizeof( wbuf ), "%s:%s", envp, port ); // smash port onto the addr as is
+ l->addrs[l->naddrs] = strdup( wbuf );
+ l->naddrs++;
+ if( DEBUG ) rmr_vlog( RMR_VL_INFO, "rmr: using only specific bind interface when searching specific RT entries: %s\n", wbuf );
+ return l;
+ }
+
+ target_if = envp; // device name given, suss it out below
}
getifaddrs( &ifs );
for( ele = ifs; ele; ele = ele->ifa_next ) {
- *octs = 0;
+ memset( octs, 0, sizeof( octs ) );
+ if( ele && strcmp( ele->ifa_name, "lo" ) && // do NOT capture the loopback interface address
+ (target_if == NULL || strcmp( ele->ifa_name, target_if ) == 0 ) ) { // no target, or matches ENV_BIND_IF target
- if( ele && strcmp( ele->ifa_name, "lo" ) ) {
if( ele->ifa_addr->sa_family == AF_INET ) {
getnameinfo( ele->ifa_addr, sizeof( struct sockaddr_in ), octs, NI_MAXHOST, NULL, 0, NI_NUMERICHOST );
fmt = "%s:%s";
}
if( *octs ) {
+ if( (tok = strchr( octs, '%' )) != NULL ) { // for unknown reasons some ip6 addrs have %if-name appended; truncate
+ *tok = 0;
+ }
if( l->naddrs < 128 ) {
+ if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "capture address: %s: %s\n", ele->ifa_name, octs );
+
snprintf( wbuf, sizeof( wbuf ), fmt, octs, port ); // smash port onto the addr
l->addrs[l->naddrs] = strdup( wbuf );
l->naddrs++;
return 0;
}
+ if( addr == NULL ) {
+ return 0;
+ }
+
for( i = 0; i < l->naddrs; i++ ) {
- if( strcmp( addr, l->addrs[i] ) == 0 ) {
+ if( l->addrs[i] != NULL && strcmp( addr, l->addrs[i] ) == 0 ) {
return 1;
}
}
return rc;
}
+/*
+ Given a list manager block, return the default IP address.
+ For now, that is just the first address on the list which
+ easily could be non-deterministic and change with each restart
+ of the application if a specific interface is not provided via
+ the environment variable (ENV_BIND_IF) and if there is more than
+ one device available on the container/physical host.
+*/
+static char* get_default_ip( if_addrs_t* iplist ) {
+
+ if( iplist != NULL && iplist->naddrs > 0 && iplist->addrs != NULL ) {
+ return strdup( iplist->addrs[0] );
+ }
+
+ return NULL;
+}
+
#endif
Code Review / ric-plt / lib / rmr.git / blobdiff