#include <assert.h>
#include <ctype.h>
#include <errno.h>
+#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
_(recvfrom, ssize_t, (int, void *buf, size_t, int, \
struct sockaddr *from, socklen_t *fromlen)) \
_(sendmsg, ssize_t, (int, const struct msghdr *, int)) \
- _(recvmsg, ssize_t, (int, struct msghdr *, int))
+ _(recvmsg, ssize_t, (int, struct msghdr *, int)) \
+ _(ioctl, int, (int, unsigned long, ...))
/* Function pointers to set up. */
#define DECL(imp, ret, args) static ret (*real_##imp) args;
/* Debugging */
#ifdef DEBUG
# define D(body) { if (debug) { body } }
+# define Dpid pid_t pid = debug ? getpid() : -1
#else
# define D(body) ;
+# define Dpid
#endif
/* Preservation of error status */
#define WANT(n_) do { if (sz < (n_)) goto nospace; } while (0)
#define PUTC(c_) do { *buf++ = (c_); sz--; } while (0)
+ if (!sa) return "<null-address>";
if (!sz) return "<no-space-in-buffer>";
if (!len) len = family_socklen(sa->sa_family);
const char *p;
int plen;
- fprintf(stderr, "noip: %c ", a->act ? '+' : '-');
+ fprintf(stderr, "noip(%d): %c ", getpid(), a->act ? '+' : '-');
plen = common_prefix_length(a->af, &a->minaddr, &a->maxaddr);
p = inet_ntop(a->af, &a->minaddr, buf, sizeof(buf));
fprintf(stderr, strchr(p, ':') ? "[%s]" : "%s", p);
dump_aclnode(a);
act = a->act;
}
- fprintf(stderr, "noip: [default policy: %s]\n",
+ fprintf(stderr, "noip(%d): [default policy: %s]\n", getpid(),
act == ALLOW ? "DENY" : "ALLOW");
}
{
unsigned short port = port_from_sockaddr(sa);
int act = ALLOW;
+ Dpid;
D({ char buf[ADDRBUFSZ];
- fprintf(stderr, "noip: check %s\n",
+ fprintf(stderr, "noip(%d): check %s\n", pid,
present_sockaddr(sa, 0, buf, sizeof(buf))); })
for (; a; a = a->next) {
D( dump_aclnode(a); )
if (sockaddr_in_range_p(sa, &a->minaddr, &a->maxaddr) &&
a->minport <= port && port <= a->maxport) {
- D( fprintf(stderr, "noip: aha! %s\n", a->act ? "ALLOW" : "DENY"); )
+ D( fprintf(stderr, "noip(%d): aha! %s\n", pid,
+ a->act ? "ALLOW" : "DENY"); )
return (a->act);
}
act = a->act;
}
- D( fprintf(stderr, "noip: nothing found: %s\n", act ? "DENY" : "ALLOW"); )
+ D( fprintf(stderr, "noip(%d): nothing found: %s\n", pid,
+ act ? "DENY" : "ALLOW"); )
return (!act);
}
char buf[ADDRBUFSZ];
int rc;
- D( fprintf(stderr, "noip: encode %s (%s)",
+ D( fprintf(stderr, "noip(%d): encode %s (%s)", getpid(),
present_sockaddr(sa, 0, buf, sizeof(buf)),
want == WANT_EXISTING ? "EXISTING" : "FRESH"); )
sun->sun_family = AF_UNIX;
if (len > sizeof(*sun)) return (-1);
((char *)sun)[len] = 0;
nn = strlen(sun->sun_path);
- D( fprintf(stderr, "noip: decode `%s'", sun->sun_path); )
+ D( fprintf(stderr, "noip(%d): decode `%s'", getpid(), sun->sun_path); )
if (af_hint && !sun->sun_path[0]) {
wildcard_address(af_hint, sa);
D( fprintf(stderr, " -- unbound socket\n"); )
/* SK is (or at least might be) a Unix-domain socket we created when an
* Internet socket was asked for. We've decided it should be an Internet
- * socket after all, with family AF_HINT, so convert it.
+ * socket after all, with family AF_HINT, so convert it. If TMP is not null,
+ * then don't replace the existing descriptor: store the new socket in *TMP
+ * and return zero.
*/
-static int fixup_real_ip_socket(int sk, int af_hint)
+static int fixup_real_ip_socket(int sk, int af_hint, int *tmp)
{
int nsk;
int type;
} while (0);
OPTS(FIX)
#undef FIX
- if ((f = fcntl(sk, F_GETFL)) < 0 ||
- (fd = fcntl(sk, F_GETFD)) < 0 ||
- fcntl(nsk, F_SETFL, f) < 0 ||
- dup2(nsk, sk) < 0) {
+ if (tmp)
+ *tmp = nsk;
+ else {
+ if ((f = fcntl(sk, F_GETFL)) < 0 ||
+ (fd = fcntl(sk, F_GETFD)) < 0 ||
+ fcntl(nsk, F_SETFL, f) < 0 ||
+ dup2(nsk, sk) < 0) {
+ close(nsk);
+ return (-1);
+ }
+ unlink(sun.sun_path);
close(nsk);
- return (-1);
- }
- unlink(sun.sun_path);
- close(nsk);
- if (fcntl(sk, F_SETFD, fd) < 0) {
- perror("noip: fixup_real_ip_socket F_SETFD");
- abort();
+ if (fcntl(sk, F_SETFD, fd) < 0) {
+ perror("noip: fixup_real_ip_socket F_SETFD");
+ abort();
+ }
}
return (0);
}
socklen_t mylen = sizeof(*sun);
if (acl_allows_p(connect_real, *sa)) {
- if (fixup_real_ip_socket(sk, (*sa)->sa_family)) return (-1);
+ if (fixup_real_ip_socket(sk, (*sa)->sa_family, 0)) return (-1);
} else {
if (real_getsockname(sk, SA(sun), &mylen) < 0) return (-1);
if (sun->sun_family == AF_UNIX) {
maxaddr = minaddr;
mask_address(af, &minaddr, n, 0);
mask_address(af, &maxaddr, n, 1);
+ RESCAN(del);
} else
maxaddr = minaddr;
parse_ports(&p, &minport, &maxport);
if (*p != ',') break;
if (*p) p++;
}
+ if (*p) goto bad;
+ *pp = p;
return;
bad:
- D( fprintf(stderr, "noip: bad acl spec (ignored)\n"); )
+ D( fprintf(stderr, "noip(%d): bad acl spec (ignored)\n", getpid()); )
return;
}
if (*p != '-') goto bad; p++;
NEXTNUMBER(q, del); y = strtoul(q, 0, 0); RESCAN(del);
minautoport = x; maxautoport = y;
+ SKIPSPC; if (*p) goto bad;
+ *pp = p;
return;
bad:
- D( fprintf(stderr, "bad port range (ignored)\n"); )
+ D( fprintf(stderr, "noip(%d): bad port range (ignored)\n", getpid()); )
return;
}
char buf[1024];
size_t n;
char *p, *q, *cmd;
+ Dpid;
parse_acl_env("NOIP_REALBIND_BEFORE", &bind_tail);
parse_acl_env("NOIP_REALCONNECT_BEFORE", &connect_tail);
}
if ((p = getenv("NOIP_CONFIG")) == 0)
snprintf(p = buf, sizeof(buf), "%s/.noip", home());
- D( fprintf(stderr, "noip: config file: %s\n", p); )
+ D( fprintf(stderr, "noip(%d): config file: %s\n", pid, p); )
if ((fp = fopen(p, "r")) == 0) {
- D( fprintf(stderr, "noip: couldn't read config: %s\n",
- strerror(errno)); )
+ D( fprintf(stderr, "noip(%d): couldn't read config: %s\n",
+ pid, strerror(errno)); )
goto done;
}
while (fgets(buf, sizeof(buf), fp)) {
snprintf(buf, sizeof(buf), "%s/noip-%s", tmpdir(), user());
sockdir = xstrdup(buf);
}
- D( fprintf(stderr, "noip: socketdir: %s\n", sockdir);
- fprintf(stderr, "noip: autoports: %u-%u\n",
- minautoport, maxautoport);
- fprintf(stderr, "noip: realbind acl:\n");
+ D( fprintf(stderr, "noip(%d): socketdir: %s\n", pid, sockdir);
+ fprintf(stderr, "noip(%d): autoports: %u-%u\n",
+ pid, minautoport, maxautoport);
+ fprintf(stderr, "noip(%d): realbind acl:\n", pid);
dump_acl(bind_real);
- fprintf(stderr, "noip: realconnect acl:\n");
+ fprintf(stderr, "noip(%d): realconnect acl:\n", pid);
dump_acl(connect_real); )
}
/*----- Overridden system calls -------------------------------------------*/
+static void dump_syserr(long rc)
+ { fprintf(stderr, " => %ld (E%d)\n", rc, errno); }
+
+static void dump_sysresult(long rc)
+{
+ if (rc < 0) dump_syserr(rc);
+ else fprintf(stderr, " => %ld\n", rc);
+}
+
+static void dump_addrresult(long rc, const struct sockaddr *sa,
+ socklen_t len)
+{
+ char addrbuf[ADDRBUFSZ];
+
+ if (rc < 0) dump_syserr(rc);
+ else {
+ fprintf(stderr, " => %ld [%s]\n", rc,
+ present_sockaddr(sa, len, addrbuf, sizeof(addrbuf)));
+ }
+}
+
int socket(int pf, int ty, int proto)
{
+ int sk;
+
+ D( fprintf(stderr, "noip(%d): SOCKET pf=%d, type=%d, proto=%d",
+ getpid(), pf, ty, proto); )
+
switch (pf) {
default:
if (!family_known_p(pf)) {
+ D( fprintf(stderr, " -> unknown; refuse\n"); )
errno = EAFNOSUPPORT;
- return (-1);
+ sk = -1;
}
+ D( fprintf(stderr, " -> inet; substitute"); )
pf = PF_UNIX;
proto = 0;
+ break;
case PF_UNIX:
#ifdef PF_NETLINK
case PF_NETLINK:
#endif
- return (real_socket(pf, ty, proto));
+ D( fprintf(stderr, " -> safe; permit"); )
+ break;
}
+ sk = real_socket(pf, ty, proto);
+ D( dump_sysresult(sk); )
+ return (sk);
}
int socketpair(int pf, int ty, int proto, int *sk)
{
- if (pf == PF_INET) {
+ int rc;
+
+ D( fprintf(stderr, "noip(%d): SOCKETPAIR pf=%d, type=%d, proto=%d",
+ getpid(), pf, ty, proto); )
+ if (!family_known_p(pf))
+ D( fprintf(stderr, " -> unknown; permit"); )
+ else {
+ D( fprintf(stderr, " -> inet; substitute"); )
pf = PF_UNIX;
proto = 0;
}
- return (real_socketpair(pf, ty, proto, sk));
+ rc = real_socketpair(pf, ty, proto, sk);
+ D( if (rc < 0) dump_syserr(rc);
+ else fprintf(stderr, " => %d (%d, %d)\n", rc, sk[0], sk[1]); )
+ return (rc);
}
int bind(int sk, const struct sockaddr *sa, socklen_t len)
{
struct sockaddr_un sun;
+ int rc;
+ Dpid;
- if (family_known_p(sa->sa_family)) {
+ D({ char buf[ADDRBUFSZ];
+ fprintf(stderr, "noip(%d): BIND sk=%d, sa[%d]=%s", pid,
+ sk, len, present_sockaddr(sa, len, buf, sizeof(buf))); })
+
+ if (!family_known_p(sa->sa_family))
+ D( fprintf(stderr, " -> unknown af; pass through"); )
+ else {
+ D( fprintf(stderr, " -> checking...\n"); )
PRESERVING_ERRNO({
if (acl_allows_p(bind_real, sa)) {
- if (fixup_real_ip_socket(sk, sa->sa_family))
+ if (fixup_real_ip_socket(sk, sa->sa_family, 0))
return (-1);
} else {
encode_inet_addr(&sun, sa, WANT_FRESH);
len = SUN_LEN(&sun);
}
});
+ D( fprintf(stderr, "noip(%d): BIND ...", pid); )
}
- return (real_bind(sk, sa, len));
+ rc = real_bind(sk, sa, len);
+ D( dump_sysresult(rc); )
+ return (rc);
}
int connect(int sk, const struct sockaddr *sa, socklen_t len)
{
struct sockaddr_un sun;
int rc;
+ Dpid;
- if (!family_known_p(sa->sa_family))
+ D({ char buf[ADDRBUFSZ];
+ fprintf(stderr, "noip(%d): CONNECT sk=%d, sa[%d]=%s", pid,
+ sk, len, present_sockaddr(sa, len, buf, sizeof(buf))); })
+
+ if (!family_known_p(sa->sa_family)) {
+ D( fprintf(stderr, " -> unknown af; pass through"); )
rc = real_connect(sk, sa, len);
- else {
+ } else {
+ D( fprintf(stderr, " -> checking...\n"); )
PRESERVING_ERRNO({
do_implicit_bind(sk, &sa, &len, &sun);
});
+ D( fprintf(stderr, "noip(%d): CONNECT ...", pid); )
rc = real_connect(sk, sa, len);
if (rc < 0) {
switch (errno) {
}
}
}
+ D( dump_sysresult(rc); )
return (rc);
}
const struct sockaddr *to, socklen_t tolen)
{
struct sockaddr_un sun;
+ ssize_t n;
+ Dpid;
+
+ D({ char addrbuf[ADDRBUFSZ];
+ fprintf(stderr, "noip(%d): SENDTO sk=%d, len=%lu, flags=%d, to[%d]=%s",
+ pid, sk, (unsigned long)len, flags, tolen,
+ present_sockaddr(to, tolen, addrbuf, sizeof(addrbuf))); })
- if (to && to->sa_family == AF_INET) {
+ if (!to)
+ D( fprintf(stderr, " -> null address; leaving"); )
+ else if (!family_known_p(to->sa_family))
+ D( fprintf(stderr, " -> unknown af; pass through"); )
+ else {
+ D( fprintf(stderr, " -> checking...\n"); )
PRESERVING_ERRNO({
do_implicit_bind(sk, &to, &tolen, &sun);
});
+ D( fprintf(stderr, "noip(%d): SENDTO ...", pid); )
}
- return (real_sendto(sk, buf, len, flags, to, tolen));
+ n = real_sendto(sk, buf, len, flags, to, tolen);
+ D( dump_sysresult(n); )
+ return (n);
}
ssize_t recvfrom(int sk, void *buf, size_t len, int flags,
char sabuf[1024];
socklen_t mylen = sizeof(sabuf);
ssize_t n;
+ Dpid;
- if (!from)
- return real_recvfrom(sk, buf, len, flags, 0, 0);
- PRESERVING_ERRNO({
- n = real_recvfrom(sk, buf, len, flags, SA(sabuf), &mylen);
- if (n < 0)
- return (-1);
- return_fake_name(SA(sabuf), mylen, from, fromlen);
- });
+ D( fprintf(stderr, "noip(%d): RECVFROM sk=%d, len=%lu, flags=%d",
+ pid, sk, (unsigned long)len, flags); )
+
+ if (!from) {
+ D( fprintf(stderr, " -> null addr; pass through"); )
+ n = real_recvfrom(sk, buf, len, flags, 0, 0);
+ } else {
+ PRESERVING_ERRNO({
+ n = real_recvfrom(sk, buf, len, flags, SA(sabuf), &mylen);
+ if (n >= 0) {
+ D( fprintf(stderr, " -> converting...\n"); )
+ return_fake_name(SA(sabuf), mylen, from, fromlen);
+ D( fprintf(stderr, "noip(%d): ... RECVFROM", pid); )
+ }
+ });
+ }
+ D( dump_addrresult(n, from, fromlen ? *fromlen : 0); )
return (n);
}
ssize_t sendmsg(int sk, const struct msghdr *msg, int flags)
{
struct sockaddr_un sun;
- const struct sockaddr *sa;
+ const struct sockaddr *sa = SA(msg->msg_name);
struct msghdr mymsg;
-
- if (msg->msg_name && SA(msg->msg_name)->sa_family == AF_INET) {
+ ssize_t n;
+ Dpid;
+
+ D({ char addrbuf[ADDRBUFSZ];
+ fprintf(stderr, "noip(%d): SENDMSG sk=%d, "
+ "msg_flags=%d, msg_name[%d]=%s, ...",
+ pid, sk, msg->msg_flags, msg->msg_namelen,
+ present_sockaddr(sa, msg->msg_namelen,
+ addrbuf, sizeof(addrbuf))); })
+
+ if (!sa)
+ D( fprintf(stderr, " -> null address; leaving"); )
+ else if (!family_known_p(sa->sa_family))
+ D( fprintf(stderr, " -> unknown af; pass through"); )
+ else {
+ D( fprintf(stderr, " -> checking...\n"); )
PRESERVING_ERRNO({
- sa = SA(msg->msg_name);
mymsg = *msg;
do_implicit_bind(sk, &sa, &mymsg.msg_namelen, &sun);
mymsg.msg_name = SA(sa);
msg = &mymsg;
});
+ D( fprintf(stderr, "noip(%d): SENDMSG ...", pid); )
}
- return (real_sendmsg(sk, msg, flags));
+ n = real_sendmsg(sk, msg, flags);
+ D( dump_sysresult(n); )
+ return (n);
}
ssize_t recvmsg(int sk, struct msghdr *msg, int flags)
{
char sabuf[1024];
- struct sockaddr *sa;
- socklen_t len;
+ struct sockaddr *sa = SA(msg->msg_name);
+ socklen_t len = msg->msg_namelen;
ssize_t n;
+ Dpid;
+
+ D( fprintf(stderr, "noip(%d): RECVMSG sk=%d msg_flags=%d, ...",
+ pid, sk, msg->msg_flags); )
- if (!msg->msg_name)
+ if (!msg->msg_name) {
+ D( fprintf(stderr, " -> null addr; pass through"); )
return (real_recvmsg(sk, msg, flags));
- PRESERVING_ERRNO({
- sa = SA(msg->msg_name);
- len = msg->msg_namelen;
- msg->msg_name = sabuf;
- msg->msg_namelen = sizeof(sabuf);
- n = real_recvmsg(sk, msg, flags);
- if (n < 0)
- return (-1);
- return_fake_name(SA(sabuf), msg->msg_namelen, sa, &len);
- msg->msg_name = sa;
- msg->msg_namelen = len;
- });
+ } else {
+ PRESERVING_ERRNO({
+ msg->msg_name = sabuf;
+ msg->msg_namelen = sizeof(sabuf);
+ n = real_recvmsg(sk, msg, flags);
+ if (n >= 0) {
+ D( fprintf(stderr, " -> converting...\n"); )
+ return_fake_name(SA(sabuf), msg->msg_namelen, sa, &len);
+ D( fprintf(stderr, "noip(%d): ... RECVMSG", pid); )
+ }
+ msg->msg_name = sa;
+ msg->msg_namelen = len;
+ });
+ }
+ D( dump_addrresult(n, sa, len); )
return (n);
}
{
char sabuf[1024];
socklen_t mylen = sizeof(sabuf);
- int nsk = real_accept(sk, SA(sabuf), &mylen);
+ int nsk;
+ Dpid;
- if (nsk < 0)
- return (-1);
- return_fake_name(SA(sabuf), mylen, sa, len);
+ D( fprintf(stderr, "noip(%d): ACCEPT sk=%d", pid, sk); )
+
+ nsk = real_accept(sk, SA(sabuf), &mylen);
+ if (nsk < 0) /* failed */;
+ else if (!sa) D( fprintf(stderr, " -> address not wanted"); )
+ else {
+ D( fprintf(stderr, " -> converting...\n"); )
+ return_fake_name(SA(sabuf), mylen, sa, len);
+ D( fprintf(stderr, "noip(%d): ... ACCEPT", pid); )
+ }
+ D( dump_addrresult(nsk, sa, len ? *len : 0); )
return (nsk);
}
int getsockname(int sk, struct sockaddr *sa, socklen_t *len)
{
+ int rc;
+ Dpid;
+
+ D( fprintf(stderr, "noip(%d): GETSOCKNAME sk=%d", pid, sk); )
PRESERVING_ERRNO({
char sabuf[1024];
socklen_t mylen = sizeof(sabuf);
- if (real_getsockname(sk, SA(sabuf), &mylen))
- return (-1);
- return_fake_name(SA(sabuf), mylen, sa, len);
+ rc = real_getsockname(sk, SA(sabuf), &mylen);
+ if (rc >= 0) {
+ D( fprintf(stderr, " -> converting...\n"); )
+ return_fake_name(SA(sabuf), mylen, sa, len);
+ D( fprintf(stderr, "noip(%d): ... GETSOCKNAME", pid); )
+ }
});
- return (0);
+ D( dump_addrresult(rc, sa, *len); )
+ return (rc);
}
int getpeername(int sk, struct sockaddr *sa, socklen_t *len)
{
+ int rc;
+ Dpid;
+
+ D( fprintf(stderr, "noip(%d): GETPEERNAME sk=%d", pid, sk); )
PRESERVING_ERRNO({
char sabuf[1024];
socklen_t mylen = sizeof(sabuf);
- if (real_getpeername(sk, SA(sabuf), &mylen))
- return (-1);
- return_fake_name(SA(sabuf), mylen, sa, len);
+ rc = real_getpeername(sk, SA(sabuf), &mylen);
+ if (rc >= 0) {
+ D( fprintf(stderr, " -> converting...\n"); )
+ return_fake_name(SA(sabuf), mylen, sa, len);
+ D( fprintf(stderr, "noip(%d): ... GETPEERNAME", pid); )
+ }
});
+ D( dump_addrresult(rc, sa, *len); )
return (0);
}
return (real_setsockopt(sk, lev, opt, p, len));
}
+int ioctl(int fd, unsigned long op, ...)
+{
+ va_list ap;
+ void *arg;
+ int sk;
+ int rc;
+
+ va_start(ap, op);
+ arg = va_arg(ap, void *);
+
+ switch (op) {
+ case SIOCGIFADDR:
+ case SIOCGIFBRDADDR:
+ case SIOCGIFDSTADDR:
+ case SIOCGIFNETMASK:
+ PRESERVING_ERRNO({
+ if (fixup_real_ip_socket(fd, AF_INET, &sk)) goto real;
+ });
+ rc = real_ioctl(sk, op, arg);
+ PRESERVING_ERRNO({ close(sk); });
+ break;
+ default:
+ real:
+ rc = real_ioctl(fd, op, arg);
+ break;
+ }
+ va_end(ap);
+ return (rc);
+}
+
/*----- Initialization ----------------------------------------------------*/
/* Clean up the socket directory, deleting stale sockets. */
address addr;
struct sockaddr_un sun;
struct stat st;
+ Dpid;
if ((dir = opendir(sockdir)) == 0) return;
sun.sun_family = AF_UNIX;
if (decode_inet_addr(&addr.sa, 0, &sun, SUN_LEN(&sun)) ||
stat(sun.sun_path, &st) ||
!S_ISSOCK(st.st_mode)) {
- D( fprintf(stderr, "noip: ignoring unknown socketdir entry `%s'\n",
- sun.sun_path); )
+ D( fprintf(stderr, "noip(%d): ignoring unknown socketdir entry `%s'\n",
+ pid, sun.sun_path); )
continue;
}
if (unix_socket_status(&sun, 0) == STALE) {
- D( fprintf(stderr, "noip: clearing away stale socket %s\n",
- d->d_name); )
+ D( fprintf(stderr, "noip(%d): clearing away stale socket %s\n",
+ pid, d->d_name); )
unlink(sun.sun_path);
}
}
struct ifaddrs *ifa_head, *ifa;
ipaddr a;
int i;
+ Dpid;
+ D( fprintf(stderr, "noip(%d): fetching local addresses...\n", pid); )
if (getifaddrs(&ifa_head)) { perror("getifaddrs"); return; }
for (n_local_ipaddrs = 0, ifa = ifa_head;
n_local_ipaddrs < MAX_LOCAL_IPADDRS && ifa;
continue;
ipaddr_from_sockaddr(&a, ifa->ifa_addr);
D({ char buf[ADDRBUFSZ];
- fprintf(stderr, "noip: local addr %s = %s", ifa->ifa_name,
+ fprintf(stderr, "noip(%d): local addr %s = %s", pid,
+ ifa->ifa_name,
inet_ntop(ifa->ifa_addr->sa_family, &a,
buf, sizeof(buf))); })
for (i = 0; i < n_local_ipaddrs; i++) {
~mdw / preload-hacks / blobdiff