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authorvenaas <venaas>2009-01-26 10:49:17 +0000
committervenaas <venaas@e88ac4ed-0b26-0410-9574-a7f39faa03bf>2009-01-26 10:49:17 +0000
commitea5f7bbd32c0943bb7ab52331ab524ec40a86ec7 (patch)
tree1fd2214cc26037337e620db419149711807090db
parent64dad5a7723089248b12b98cb2cd2ab0c4a68cd3 (diff)
new code for handling parsing and resolving etc of host, port and prefixes
git-svn-id: https://svn.testnett.uninett.no/radsecproxy/trunk@459 e88ac4ed-0b26-0410-9574-a7f39faa03bf
-rw-r--r--resolve.c155
-rw-r--r--resolve.h14
2 files changed, 169 insertions, 0 deletions
diff --git a/resolve.c b/resolve.c
new file mode 100644
index 0000000..198181c
--- /dev/null
+++ b/resolve.c
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2006-2009 Stig Venaas <venaas@uninett.no>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ */
+
+void resolve_freehostport(struct hostportres *hp) {
+ if (hp) {
+ free(hp->host);
+ free(hp->port);
+ if (hp->addrinfo)
+ freeaddrinfo(hp->addrinfo);
+ free(hp);
+ }
+}
+
+int resolve_parsehostport(struct hostportres *hp, char *hostport, char *default_port) {
+ char *p, *field;
+ int ipv6 = 0;
+
+ p = hostport;
+ /* allow literal addresses and port, e.g. [2001:db8::1]:1812 */
+ if (*p == '[') {
+ p++;
+ field = p;
+ for (; *p && *p != ']' && *p != ' ' && *p != '\t' && *p != '\n'; p++);
+ if (*p != ']') {
+ debug(DBG_ERR, "no ] matching initial [");
+ return 0;
+ }
+ ipv6 = 1;
+ } else {
+ field = p;
+ for (; *p && *p != ':' && *p != ' ' && *p != '\t' && *p != '\n'; p++);
+ }
+ if (field == p) {
+ debug(DBG_ERR, "missing host/address");
+ return 0;
+ }
+
+ hp->host = stringcopy(field, p - field);
+ if (ipv6) {
+ p++;
+ if (*p && *p != ':' && *p != ' ' && *p != '\t' && *p != '\n') {
+ debug(DBG_ERR, "unexpected character after ]");
+ return 0;
+ }
+ }
+ if (*p == ':') {
+ /* port number or service name is specified */;
+ field = ++p;
+ for (; *p && *p != ' ' && *p != '\t' && *p != '\n'; p++);
+ if (field == p) {
+ debug(DBG_ERR, "syntax error, : but no following port");
+ return 0;
+ }
+ hp->port = stringcopy(field, p - field);
+ } else
+ hp->port = default_port ? stringcopy(default_port, 0) : NULL;
+ return 1;
+}
+
+struct hostportres *resolve_newhostport(char *hostport, char *default_port, int socktype, uint8_t passive, uint8_t prefixok) {
+ struct hostportres *hp;
+ struct addrinfo hints, *res;
+ char *slash, *s;
+ int plen = 0;
+
+ hp = malloc(sizeof(struct hostportres));
+ if (!hp) {
+ debug(DBG_ERR, "resolve_newhostport: malloc failed");
+ goto errexit;
+ }
+ memset(hp, 0, sizeof(struct hostportres));
+
+ if (!resolve_parsehostport(hp, hostport, default_port))
+ goto errexit;
+
+ if (!strcmp(hp->host, "*")) {
+ free(hp->host);
+ hp->host = NULL;
+ }
+
+ slash = hp->host ? strchr(hp->host, '/') : NULL;
+ if (slash) {
+ if (!prefixok) {
+ debug(DBG_WARN, "resolve_newhostport: prefix not allowed here", hp->host);
+ goto errexit;
+ }
+ s = slash + 1;
+ if (!*s) {
+ debug(DBG_WARN, "resolve_newhostport: prefix length must be specified after the / in %s", hp->host);
+ goto errexit;
+ }
+ for (; *s; s++)
+ if (*s < '0' || *s > '9') {
+ debug(DBG_WARN, "resolve_newhostport: %s in %s is not a valid prefix length", slash + 1, hp->host);
+ goto errexit;
+ }
+ plen = atoi(slash + 1);
+ if (plen < 0 || plen > 128) {
+ debug(DBG_WARN, "resolve_newhostport: %s in %s is not a valid prefix length", slash + 1, hp->host);
+ goto errexit;
+ }
+ *slash = '\0';
+ }
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_socktype = socktype;
+ hints.ai_family = AF_UNSPEC;
+ if (passive)
+ hints.ai_flags = AI_PASSIVE;
+
+ if (!hp->host && !hp->port) {
+ /* getaddrinfo() doesn't like host and port to be NULL */
+ if (getaddrinfo(hp->host, default_port, &hints, &hp->addrinfo)) {
+ debug(DBG_WARN, "resolve_newhostport: can't resolve (null) port (null)");
+ goto errexit;
+ }
+ for (res = hp->addrinfo; res; res = res->ai_next)
+ port_set(res->ai_addr, 0);
+ } else {
+ if (slash)
+ hints.ai_flags |= AI_NUMERICHOST;
+ if (getaddrinfo(hp->host, hp->port, &hints, &hp->addrinfo)) {
+ debug(DBG_WARN, "resolve_newhostport: can't resolve %s port %s", hp->host ? hp->host : "(null)", hp->port ? hp->port : "(null)");
+ goto errexit;
+ }
+ if (slash) {
+ *slash = '/';
+ switch (hp->addrinfo->ai_family) {
+ case AF_INET:
+ if (plen > 32) {
+ debug(DBG_WARN, "resolve_newhostport: prefix length must be <= 32 in %s", hp->host);
+ goto errexit;
+ }
+ break;
+ case AF_INET6:
+ break;
+ default:
+ debug(DBG_WARN, "resolve_newhostport: prefix must be IPv4 or IPv6 in %s", hp->host);
+ goto errexit;
+ }
+ hp->prefixlen = (uint8_t)plen;
+ } else
+ hp->prefixlen = 255;
+ }
+ return hp;
+
+ errexit:
+ resolve_freehostport(hostportres);
+ return NULL;
+}
diff --git a/resolve.h b/resolve.h
new file mode 100644
index 0000000..fdb83b9
--- /dev/null
+++ b/resolve.h
@@ -0,0 +1,14 @@
+/*
+ * Copyright (C) 2006-2009 Stig Venaas <venaas@uninett.no>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ */
+
+struct hostportres {
+ char *host;
+ char *port;
+ uint8_t prefixlen;
+ struct addrinfo *addrinfo;
+};