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

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;
+};