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-rw-r--r--lib/radsecproxy/util.c256
1 files changed, 256 insertions, 0 deletions
diff --git a/lib/radsecproxy/util.c b/lib/radsecproxy/util.c
new file mode 100644
index 0000000..ad974ac
--- /dev/null
+++ b/lib/radsecproxy/util.c
@@ -0,0 +1,256 @@
+/* Copyright (c) 2007-2009, UNINETT AS */
+/* See LICENSE for licensing information. */
+
+/* Code contributions from:
+ *
+ * Stefan Winter <stefan.winter@restena.lu>
+ */
+
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/select.h>
+#include <stdarg.h>
+#include "debug.h"
+#include "util.h"
+
+char *stringcopy(const char *s, int len) {
+ char *r;
+ if (!s)
+ return NULL;
+ if (!len)
+ len = strlen(s);
+ r = malloc(len + 1);
+ if (!r)
+ debug(DBG_ERR, "stringcopy: malloc failed");
+ memcpy(r, s, len);
+ r[len] = '\0';
+ return r;
+}
+
+void printfchars(char *prefixfmt, char *prefix, char *charfmt, char *chars, int len) {
+ int i;
+ unsigned char *s = (unsigned char *)chars;
+ if (prefix)
+ printf(prefixfmt ? prefixfmt : "%s: ", prefix);
+ for (i = 0; i < len; i++)
+ printf(charfmt ? charfmt : "%c", s[i]);
+ printf("\n");
+}
+
+void port_set(struct sockaddr *sa, uint16_t port) {
+ switch (sa->sa_family) {
+ case AF_INET:
+ ((struct sockaddr_in *)sa)->sin_port = htons(port);
+ break;
+ case AF_INET6:
+ ((struct sockaddr_in6 *)sa)->sin6_port = htons(port);
+ break;
+ }
+}
+
+struct sockaddr *addr_copy(struct sockaddr *in) {
+ struct sockaddr *out = NULL;
+
+ switch (in->sa_family) {
+ case AF_INET:
+ out = malloc(sizeof(struct sockaddr_in));
+ if (out) {
+ memset(out, 0, sizeof(struct sockaddr_in));
+ ((struct sockaddr_in *)out)->sin_addr = ((struct sockaddr_in *)in)->sin_addr;
+ }
+ break;
+ case AF_INET6:
+ out = malloc(sizeof(struct sockaddr_in6));
+ if (out) {
+ memset(out, 0, sizeof(struct sockaddr_in6));
+ ((struct sockaddr_in6 *)out)->sin6_addr = ((struct sockaddr_in6 *)in)->sin6_addr;
+ }
+ break;
+ }
+ out->sa_family = in->sa_family;
+#ifdef SIN6_LEN
+ out->sa_len = in->sa_len;
+#endif
+ return out;
+}
+
+char *addr2string(struct sockaddr *addr) {
+ union {
+ struct sockaddr *sa;
+ struct sockaddr_in *sa4;
+ struct sockaddr_in6 *sa6;
+ } u;
+ struct sockaddr_in sa4;
+ static char addr_buf[2][INET6_ADDRSTRLEN];
+ static int i = 0;
+ i = !i;
+ u.sa = addr;
+ if (u.sa->sa_family == AF_INET6) {
+ if (IN6_IS_ADDR_V4MAPPED(&u.sa6->sin6_addr)) {
+ memset(&sa4, 0, sizeof(sa4));
+ sa4.sin_family = AF_INET;
+ sa4.sin_port = u.sa6->sin6_port;
+ memcpy(&sa4.sin_addr, &u.sa6->sin6_addr.s6_addr[12], 4);
+ u.sa4 = &sa4;
+ }
+ }
+ if (getnameinfo(u.sa, SOCKADDRP_SIZE(u.sa), addr_buf[i], sizeof(addr_buf[i]),
+ NULL, 0, NI_NUMERICHOST)) {
+ debug(DBG_WARN, "getnameinfo failed");
+ return "getnameinfo_failed";
+ }
+ return addr_buf[i];
+}
+
+#if 0
+/* not in use */
+int connectport(int type, char *host, char *port) {
+ struct addrinfo hints, *res0, *res;
+ int s = -1;
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_socktype = type;
+ hints.ai_family = AF_UNSPEC;
+
+ if (getaddrinfo(host, port, &hints, &res0) != 0) {
+ debug(DBG_ERR, "connectport: can't resolve host %s port %s", host, port);
+ return -1;
+ }
+
+ for (res = res0; res; res = res->ai_next) {
+ s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
+ if (s < 0) {
+ debug(DBG_WARN, "connectport: socket failed");
+ continue;
+ }
+ if (connect(s, res->ai_addr, res->ai_addrlen) == 0)
+ break;
+ debug(DBG_WARN, "connectport: connect failed");
+ close(s);
+ s = -1;
+ }
+ freeaddrinfo(res0);
+ return s;
+}
+#endif
+
+/* Disable the "Don't Fragment" bit for UDP sockets. It is set by default, which may cause an "oversized"
+ RADIUS packet to be discarded on first attempt (due to Path MTU discovery).
+*/
+
+void disable_DF_bit(int socket, struct addrinfo *res) {
+ if ((res->ai_family == AF_INET) && (res->ai_socktype == SOCK_DGRAM)) {
+#if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT)
+ /*
+ * Turn off Path MTU discovery on IPv4/UDP sockets, Linux variant.
+ */
+ int r, action;
+ debug(DBG_INFO, "disable_DF_bit: disabling DF bit (Linux variant)");
+ action = IP_PMTUDISC_DONT;
+ r = setsockopt(socket, IPPROTO_IP, IP_MTU_DISCOVER, &action, sizeof(action));
+ if (r == -1)
+ debug(DBG_WARN, "Failed to set IP_MTU_DISCOVER");
+#else
+ debug(DBG_INFO, "Non-Linux platform, unable to unset DF bit for UDP. You should check with tcpdump whether radsecproxy will send its UDP packets with DF bit set!");
+#endif
+ }
+}
+
+int bindtoaddr(struct addrinfo *addrinfo, int family, int reuse, int v6only) {
+ int s, on = 1;
+ struct addrinfo *res;
+
+ for (res = addrinfo; res; res = res->ai_next) {
+ if (family != AF_UNSPEC && family != res->ai_family)
+ continue;
+ s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
+ if (s < 0) {
+ debug(DBG_WARN, "bindtoaddr: socket failed");
+ continue;
+ }
+
+ disable_DF_bit(s,res);
+
+ if (reuse)
+ setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
+#ifdef IPV6_V6ONLY
+ if (v6only)
+ setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on));
+#endif
+ if (!bind(s, res->ai_addr, res->ai_addrlen))
+ return s;
+ debug(DBG_WARN, "bindtoaddr: bind failed");
+ close(s);
+ }
+ return -1;
+}
+
+int connectnonblocking(int s, const struct sockaddr *addr, socklen_t addrlen, struct timeval *timeout) {
+ int origflags, error = 0, r = -1;
+ fd_set writefds;
+ socklen_t len;
+
+ origflags = fcntl(s, F_GETFL, 0);
+ fcntl(s, F_SETFL, origflags | O_NONBLOCK);
+ if (!connect(s, addr, addrlen)) {
+ r = 0;
+ goto exit;
+ }
+ if (errno != EINPROGRESS)
+ goto exit;
+
+ FD_ZERO(&writefds);
+ FD_SET(s, &writefds);
+ if (select(s + 1, NULL, &writefds, NULL, timeout) < 1)
+ goto exit;
+
+ len = sizeof(error);
+ if (!getsockopt(s, SOL_SOCKET, SO_ERROR, (char*)&error, &len) && !error)
+ r = 0;
+
+exit:
+ fcntl(s, F_SETFL, origflags);
+ return r;
+}
+
+int connecttcp(struct addrinfo *addrinfo, struct addrinfo *src, uint16_t timeout) {
+ int s;
+ struct addrinfo *res;
+ struct timeval to;
+
+ s = -1;
+ if (timeout) {
+ if (addrinfo && addrinfo->ai_next && timeout > 5)
+ timeout = 5;
+ to.tv_sec = timeout;
+ to.tv_usec = 0;
+ }
+
+ for (res = addrinfo; res; res = res->ai_next) {
+ s = bindtoaddr(src, res->ai_family, 1, 1);
+ if (s < 0) {
+ debug(DBG_WARN, "connecttoserver: socket failed");
+ continue;
+ }
+ if ((timeout
+ ? connectnonblocking(s, res->ai_addr, res->ai_addrlen, &to)
+ : connect(s, res->ai_addr, res->ai_addrlen)) == 0)
+ break;
+ debug(DBG_WARN, "connecttoserver: connect failed");
+ close(s);
+ s = -1;
+ }
+ return s;
+}
+
+/* Local Variables: */
+/* c-file-style: "stroustrup" */
+/* End: */
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