/*----- Data structures ---------------------------------------------------*/
enum { UNUSED, STALE, USED }; /* Unix socket status values */
-enum { WANT_FRESH, WANT_EXISTING }; /* Socket address dispositions */
enum { DENY, ALLOW }; /* ACL verdicts */
static int address_families[] = { AF_INET, AF_INET6, -1 };
unsigned short minport, maxport;
} aclnode;
+/* Implicit bind records */
+typedef struct impbind {
+ struct impbind *next;
+ int af, how;
+ ipaddr minaddr, maxaddr, bindaddr;
+} impbind;
+enum { EXPLICIT, SAME };
+
+/* A type for an address range */
+typedef struct addrrange {
+ int type;
+ union {
+ struct { int af; ipaddr min, max; } range;
+ } u;
+} addrrange;
+enum { EMPTY, ANY, LOCAL, RANGE };
+
/* Local address records */
typedef struct full_ipaddr {
int af;
/* Access control lists */
static aclnode *bind_real, **bind_tail = &bind_real;
static aclnode *connect_real, **connect_tail = &connect_real;
+static impbind *impbinds, **impbind_tail = &impbinds;
/*----- Import the real versions of functions -----------------------------*/
}
}
+/* Store the address A in SA. */
+static void ipaddr_to_sockaddr(struct sockaddr *sa, const ipaddr *a)
+{
+ switch (sa->sa_family) {
+ case AF_INET:
+ SIN(sa)->sin_addr = a->v4;
+ break;
+ case AF_INET6:
+ SIN6(sa)->sin6_addr = a->v6;
+ SIN6(sa)->sin6_scope_id = 0;
+ SIN6(sa)->sin6_flowinfo = 0;
+ break;
+ default:
+ abort();
+ }
+}
+
/* Copy a whole socket address about. */
static void copy_sockaddr(struct sockaddr *sa_dst,
const struct sockaddr *sa_src)
#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);
#ifdef DEBUG
-/* Write to standard error a description of the ACL node A. */
-static void dump_aclnode(const aclnode *a)
+static void dump_addrrange(int af, const ipaddr *min, const ipaddr *max)
{
char buf[ADDRBUFSZ];
const char *p;
int plen;
- 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));
+ plen = common_prefix_length(af, min, max);
+ p = inet_ntop(af, min, buf, sizeof(buf));
fprintf(stderr, strchr(p, ':') ? "[%s]" : "%s", p);
if (plen < 0) {
- p = inet_ntop(a->af, &a->maxaddr, buf, sizeof(buf));
+ p = inet_ntop(af, &max, buf, sizeof(buf));
fprintf(stderr, strchr(p, ':') ? "-[%s]" : "-%s", p);
- } else if (plen < address_width(a->af))
+ } else if (plen < address_width(af))
fprintf(stderr, "/%d", plen);
+}
+
+/* Write to standard error a description of the ACL node A. */
+static void dump_aclnode(const aclnode *a)
+{
+ fprintf(stderr, "noip(%d): %c ", getpid(), a->act ? '+' : '-');
+ dump_addrrange(a->af, &a->minaddr, &a->maxaddr);
if (a->minport != 0 || a->maxport != 0xffff) {
fprintf(stderr, ":%u", (unsigned)a->minport);
if (a->minport != a->maxport)
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) &&
+ if (a->af == sa->sa_family &&
+ sockaddr_in_range_p(sa, &a->minaddr, &a->maxaddr) &&
a->minport <= port && port <= a->maxport) {
D( fprintf(stderr, "noip(%d): aha! %s\n", pid,
a->act ? "ALLOW" : "DENY"); )
return (rc);
}
-/* Encode the Internet address SA as a Unix-domain address SUN. If WANT is
- * WANT_FRESH, and SA's port number is zero, then we pick an arbitrary local
- * port. Otherwise we pick the port given. There's an unpleasant hack to
- * find servers bound to local wildcard addresses. Returns zero on success;
- * -1 on failure.
+/* Convert the IP address SA to a Unix-domain address SUN. Fail if the
+ * address seems already taken. If DESPARATEP then try cleaning up stale old
+ * sockets.
+ */
+static int encode_unused_inet_addr(struct sockaddr *sa,
+ struct sockaddr_un *sun,
+ int desperatep)
+{
+ address waddr;
+ struct sockaddr_un wsun;
+ int rc;
+ char buf[ADDRBUFSZ];
+ int port = port_from_sockaddr(sa);
+
+ snprintf(sun->sun_path, sizeof(sun->sun_path), "%s/%s", sockdir,
+ present_sockaddr(sa, 0, buf, sizeof(buf)));
+ if ((rc = unix_socket_status(sun, !desperatep)) == USED) return (-1);
+ else if (rc == STALE) unlink(sun->sun_path);
+
+ wildcard_address(sa->sa_family, &waddr.sa);
+ port_to_sockaddr(&waddr.sa, port);
+ snprintf(wsun.sun_path, sizeof(wsun.sun_path), "%s/%s", sockdir,
+ present_sockaddr(&waddr.sa, 0, buf, sizeof(buf)));
+ if ((rc = unix_socket_status(&wsun, !desperatep)) == USED) return (-1);
+ else if (rc == STALE) unlink(wsun.sun_path);
+
+ return (0);
+}
+
+/* Encode the Internet address SA as a Unix-domain address SUN. If the flag
+ * `ENCF_FRESH' is set, and SA's port number is zero, then we pick an
+ * arbitrary local port. Otherwise we pick the port given. There's an
+ * unpleasant hack to find servers bound to local wildcard addresses.
+ * Returns zero on success; -1 on failure.
*/
+#define ENCF_FRESH 1u
static int encode_inet_addr(struct sockaddr_un *sun,
const struct sockaddr *sa,
- int want)
+ unsigned f)
{
int i;
int desperatep = 0;
address addr;
+ int port = port_from_sockaddr(sa);
char buf[ADDRBUFSZ];
int rc;
D( fprintf(stderr, "noip(%d): encode %s (%s)", getpid(),
present_sockaddr(sa, 0, buf, sizeof(buf)),
- want == WANT_EXISTING ? "EXISTING" : "FRESH"); )
+ (f&ENCF_FRESH) ? "FRESH" : "EXISTING"); )
sun->sun_family = AF_UNIX;
- if (port_from_sockaddr(sa) || want == WANT_EXISTING) {
+ if (port || !(f&ENCF_FRESH)) {
snprintf(sun->sun_path, sizeof(sun->sun_path), "%s/%s", sockdir,
present_sockaddr(sa, 0, buf, sizeof(buf)));
rc = unix_socket_status(sun, 0);
if (rc == STALE) unlink(sun->sun_path);
- if (rc != USED && want == WANT_EXISTING) {
+ if (rc != USED && !(f&ENCF_FRESH)) {
wildcard_address(sa->sa_family, &addr.sa);
- port_to_sockaddr(&addr.sa, port_from_sockaddr(sa));
+ port_to_sockaddr(&addr.sa, port);
snprintf(sun->sun_path, sizeof(sun->sun_path), "%s/%s", sockdir,
present_sockaddr(&addr.sa, 0, buf, sizeof(buf)));
if (unix_socket_status(sun, 0) == STALE) unlink(sun->sun_path);
copy_sockaddr(&addr.sa, sa);
for (i = 0; i < 10; i++) {
port_to_sockaddr(&addr.sa, randrange(minautoport, maxautoport));
- snprintf(sun->sun_path, sizeof(sun->sun_path), "%s/%s", sockdir,
- present_sockaddr(&addr.sa, 0, buf, sizeof(buf)));
- if (unix_socket_status(sun, 1) == UNUSED) goto found;
+ if (!encode_unused_inet_addr(&addr.sa, sun, 0)) goto found;
}
for (desperatep = 0; desperatep < 2; desperatep++) {
for (i = minautoport; i <= maxautoport; i++) {
port_to_sockaddr(&addr.sa, i);
- snprintf(sun->sun_path, sizeof(sun->sun_path), "%s/%s", sockdir,
- present_sockaddr(&addr.sa, 0, buf, sizeof(buf)));
- rc = unix_socket_status(sun, !desperatep);
- switch (rc) {
- case STALE: unlink(sun->sun_path);
- case UNUSED: goto found;
- }
+ if (!encode_unused_inet_addr(&addr.sa, sun, 0)) goto found;
}
}
errno = EADDRINUSE;
D( fprintf(stderr, " -- can't resolve\n"); )
return (-1);
- found:;
}
+found:
D( fprintf(stderr, " -> `%s'\n", sun->sun_path); )
return (0);
}
return (0);
}
+/* We found the real address SA, with length LEN; if it's a Unix-domain
+ * address corresponding to a fake socket, convert it to cover up the
+ * deception. Whatever happens, put the result at FAKE and store its length
+ * at FAKELEN.
+ */
+static void return_fake_name(struct sockaddr *sa, socklen_t len,
+ struct sockaddr *fake, socklen_t *fakelen)
+{
+ address addr;
+ socklen_t alen;
+
+ if (sa->sa_family == AF_UNIX &&
+ !decode_inet_addr(&addr.sa, 0, SUN(sa), len)) {
+ sa = &addr.sa;
+ len = family_socklen(addr.sa.sa_family);
+ }
+ alen = len;
+ if (len > *fakelen) len = *fakelen;
+ if (len > 0) memcpy(fake, sa, len);
+ *fakelen = alen;
+}
+
+/*----- Implicit binding --------------------------------------------------*/
+
+#ifdef DEBUG
+
+static void dump_impbind(const impbind *i)
+{
+ char buf[ADDRBUFSZ];
+
+ fprintf(stderr, "noip(%d): ", getpid());
+ dump_addrrange(i->af, &i->minaddr, &i->maxaddr);
+ switch (i->how) {
+ case SAME: fprintf(stderr, " <self>"); break;
+ case EXPLICIT:
+ fprintf(stderr, " %s", inet_ntop(i->af, &i->bindaddr,
+ buf, sizeof(buf)));
+ break;
+ default: abort();
+ }
+ fputc('\n', stderr);
+}
+
+static void dump_impbind_list(void)
+{
+ const impbind *i;
+
+ for (i = impbinds; i; i = i->next) dump_impbind(i);
+}
+
+#endif
+
/* The socket SK is about to be used to communicate with the remote address
* SA. Assign it a local address so that getpeername(2) does something
* useful.
{
address addr;
socklen_t mylen = sizeof(*sun);
+ const impbind *i;
+ Dpid;
if (acl_allows_p(connect_real, *sa)) {
if (fixup_real_ip_socket(sk, (*sa)->sa_family, 0)) return (-1);
if (sun->sun_family == AF_UNIX) {
if (mylen < sizeof(*sun)) ((char *)sun)[mylen] = 0;
if (!sun->sun_path[0]) {
+ D( fprintf(stderr, "noip(%d): checking impbind list...\n", pid); )
+ for (i = impbinds; i; i = i->next) {
+ D( dump_impbind(i); )
+ if ((*sa)->sa_family == i->af &&
+ sockaddr_in_range_p(*sa, &i->minaddr, &i->maxaddr)) {
+ D( fprintf(stderr, "noip(%d): match!\n", pid); )
+ addr.sa.sa_family = (*sa)->sa_family;
+ ipaddr_to_sockaddr(&addr.sa, &i->bindaddr);
+ goto found;
+ }
+ }
+ D( fprintf(stderr, "noip(%d): no match; using wildcard\n", pid); )
wildcard_address((*sa)->sa_family, &addr.sa);
- encode_inet_addr(sun, &addr.sa, WANT_FRESH);
+ found:
+ encode_inet_addr(sun, &addr.sa, ENCF_FRESH);
if (real_bind(sk, SA(sun), SUN_LEN(sun))) return (-1);
}
- encode_inet_addr(sun, *sa, WANT_EXISTING);
+ encode_inet_addr(sun, *sa, 0);
*sa = SA(sun);
*len = SUN_LEN(sun);
}
return (0);
}
-/* We found the real address SA, with length LEN; if it's a Unix-domain
- * address corresponding to a fake socket, convert it to cover up the
- * deception. Whatever happens, put the result at FAKE and store its length
- * at FAKELEN.
- */
-static void return_fake_name(struct sockaddr *sa, socklen_t len,
- struct sockaddr *fake, socklen_t *fakelen)
-{
- address addr;
- socklen_t alen;
-
- if (sa->sa_family == AF_UNIX &&
- !decode_inet_addr(&addr.sa, 0, SUN(sa), len)) {
- sa = &addr.sa;
- len = family_socklen(addr.sa.sa_family);
- }
- alen = len;
- if (len > *fakelen) len = *fakelen;
- if (len > 0) memcpy(fake, sa, len);
- *fakelen = alen;
-}
-
/*----- Configuration -----------------------------------------------------*/
/* Return the process owner's home directory. */
*pp = p;
}
-/* Make a new ACL node. ACT is the verdict; AF is the address family;
- * MINADDR and MAXADDR are the ranges on IP addresses; MINPORT and MAXPORT
- * are the ranges on port numbers; TAIL is the list tail to attach the new
- * node to.
- */
-#define ACLNODE(tail_, act_, \
- af_, minaddr_, maxaddr_, minport_, maxport_) do { \
- aclnode *a_; \
- NEW(a_); \
- a_->act = (act_); \
- a_->af = (af_); \
- a_->minaddr = (minaddr_); a_->maxaddr = (maxaddr_); \
- a_->minport = (minport_); a_->maxport = (maxport_); \
- *tail_ = a_; tail_ = &a_->next; \
-} while (0)
-
-/* Parse an ACL line. *PP points to the end of the line; *TAIL points to
- * the list tail (i.e., the final link in the list). An ACL entry has the
- * form +|- [any | local | ADDR | ADDR - ADDR | ADDR/ADDR | ADDR/INT] PORTS
- * where PORTS is parsed by parse_ports above; an ACL line consists of a
- * comma-separated sequence of entries..
+/* Parse an address range designator starting at PP and store a
+ * representation of it in R. An address range designator has the form:
+ *
+ * any | local | ADDR | ADDR - ADDR | ADDR/ADDR | ADDR/INT
*/
-static void parse_acl_line(char **pp, aclnode ***tail)
+static int parse_addrrange(char **pp, addrrange *r)
{
- ipaddr minaddr, maxaddr;
- unsigned short minport, maxport;
- int i, af, n;
- int act;
+ char *p = *pp, *q;
+ int n;
int del;
- char *p = *pp;
- char *q;
+ int af;
- for (;;) {
+ SKIPSPC;
+ if (KWMATCHP("any")) r->type = ANY;
+ else if (KWMATCHP("local")) r->type = LOCAL;
+ else {
+ parse_nextaddr(&p, &q, &del);
+ af = guess_address_family(q);
+ if (inet_pton(af, q, &r->u.range.min) <= 0) goto bad;
+ RESCAN(del);
SKIPSPC;
- if (*p == '+') act = ALLOW;
- else if (*p == '-') act = DENY;
- else goto bad;
+ if (*p == '-') {
+ p++;
+ parse_nextaddr(&p, &q, &del);
+ if (inet_pton(af, q, &r->u.range.max) <= 0) goto bad;
+ RESCAN(del);
+ } else if (*p == '/') {
+ p++;
+ NEXTNUMBER(q, del);
+ n = strtoul(q, 0, 0);
+ r->u.range.max = r->u.range.min;
+ mask_address(af, &r->u.range.min, n, 0);
+ mask_address(af, &r->u.range.max, n, 1);
+ RESCAN(del);
+ } else
+ r->u.range.max = r->u.range.min;
+ r->type = RANGE;
+ r->u.range.af = af;
+ }
+ *pp = p;
+ return (0);
- p++;
- SKIPSPC;
- if (KWMATCHP("any")) {
- parse_ports(&p, &minport, &maxport);
+bad:
+ return (-1);
+}
+
+/* Call FUNC on each individual address range in R. */
+static void foreach_addrrange(const addrrange *r,
+ void (*func)(int af,
+ const ipaddr *min,
+ const ipaddr *max,
+ void *p),
+ void *p)
+{
+ ipaddr minaddr, maxaddr;
+ int i, af;
+
+ switch (r->type) {
+ case EMPTY:
+ break;
+ case ANY:
for (i = 0; address_families[i] >= 0; i++) {
af = address_families[i];
memset(&minaddr, 0, sizeof(minaddr));
maxaddr = minaddr; mask_address(af, &maxaddr, 0, 1);
- ACLNODE(*tail, act, af, minaddr, maxaddr, minport, maxport);
+ func(af, &minaddr, &maxaddr, p);
}
- } else if (KWMATCHP("local")) {
- parse_ports(&p, &minport, &maxport);
+ break;
+ case LOCAL:
for (i = 0; address_families[i] >= 0; i++) {
af = address_families[i];
memset(&minaddr, 0, sizeof(minaddr));
maxaddr = minaddr; mask_address(af, &maxaddr, 0, 1);
- ACLNODE(*tail, act, af, minaddr, minaddr, minport, maxport);
- ACLNODE(*tail, act, af, maxaddr, maxaddr, minport, maxport);
+ func(af, &minaddr, &minaddr, p);
+ func(af, &maxaddr, &maxaddr, p);
}
for (i = 0; i < n_local_ipaddrs; i++) {
- ACLNODE(*tail, act, local_ipaddrs[i].af,
- local_ipaddrs[i].addr, local_ipaddrs[i].addr,
- minport, maxport);
+ func(local_ipaddrs[i].af,
+ &local_ipaddrs[i].addr, &local_ipaddrs[i].addr,
+ p);
}
+ break;
+ case RANGE:
+ func(r->u.range.af, &r->u.range.min, &r->u.range.max, p);
+ break;
+ default:
+ abort();
+ }
+}
+
+struct add_aclnode_ctx {
+ int act;
+ unsigned short minport, maxport;
+ aclnode ***tail;
+};
+
+static void add_aclnode(int af, const ipaddr *min, const ipaddr *max,
+ void *p)
+{
+ struct add_aclnode_ctx *ctx = p;
+ aclnode *a;
+
+ NEW(a);
+ a->act = ctx->act;
+ a->af = af;
+ a->minaddr = *min; a->maxaddr = *max;
+ a->minport = ctx->minport; a->maxport = ctx->maxport;
+ **ctx->tail = a; *ctx->tail = &a->next;
+}
+
+/* Parse an ACL line. *PP points to the end of the line; *TAIL points to
+ * the list tail (i.e., the final link in the list). An ACL entry has the
+ * form +|- ADDR-RANGE PORTS
+ * where PORTS is parsed by parse_ports above; an ACL line consists of a
+ * comma-separated sequence of entries..
+ */
+static void parse_acl_line(char **pp, aclnode ***tail)
+{
+ struct add_aclnode_ctx ctx;
+ addrrange r;
+ char *p = *pp;
+
+ ctx.tail = tail;
+ for (;;) {
+ SKIPSPC;
+ if (*p == '+') ctx.act = ALLOW;
+ else if (*p == '-') ctx.act = DENY;
+ else goto bad;
+
+ p++;
+ if (parse_addrrange(&p, &r)) goto bad;
+ parse_ports(&p, &ctx.minport, &ctx.maxport);
+ foreach_addrrange(&r, add_aclnode, &ctx);
+ SKIPSPC;
+ if (*p != ',') break;
+ if (*p) p++;
+ }
+ if (*p) goto bad;
+ *pp = p;
+ return;
+
+bad:
+ D( fprintf(stderr, "noip(%d): bad acl spec (ignored)\n", getpid()); )
+ return;
+}
+
+/* Parse an ACL from an environment variable VAR, attaching it to the list
+ * TAIL.
+ */
+static void parse_acl_env(const char *var, aclnode ***tail)
+{
+ char *p, *q;
+
+ if ((p = getenv(var)) != 0) {
+ p = q = xstrdup(p);
+ parse_acl_line(&q, tail);
+ free(p);
+ }
+}
+
+struct add_impbind_ctx {
+ int af, how;
+ ipaddr addr;
+};
+
+static void add_impbind(int af, const ipaddr *min, const ipaddr *max,
+ void *p)
+{
+ struct add_impbind_ctx *ctx = p;
+ impbind *i;
+
+ if (ctx->af && af != ctx->af) return;
+ NEW(i);
+ i->af = af;
+ i->how = ctx->how;
+ i->minaddr = *min; i->maxaddr = *max;
+ switch (ctx->how) {
+ case EXPLICIT: i->bindaddr = ctx->addr;
+ case SAME: break;
+ default: abort();
+ }
+ *impbind_tail = i; impbind_tail = &i->next;
+}
+
+/* Parse an implicit-bind line. An implicit-bind entry has the form
+ * ADDR-RANGE {ADDR | same}
+ */
+static void parse_impbind_line(char **pp)
+{
+ struct add_impbind_ctx ctx;
+ char *p = *pp, *q;
+ addrrange r;
+ int del;
+
+ for (;;) {
+ if (parse_addrrange(&p, &r)) goto bad;
+ SKIPSPC;
+ if (KWMATCHP("same")) {
+ ctx.how = SAME;
+ ctx.af = 0;
} else {
+ ctx.how = EXPLICIT;
parse_nextaddr(&p, &q, &del);
- af = guess_address_family(q);
- if (inet_pton(af, q, &minaddr) <= 0) goto bad;
+ ctx.af = guess_address_family(q);
+ if (inet_pton(ctx.af, q, &ctx.addr) < 0) goto bad;
RESCAN(del);
- SKIPSPC;
- if (*p == '-') {
- p++;
- parse_nextaddr(&p, &q, &del);
- if (inet_pton(af, q, &maxaddr) <= 0) goto bad;
- RESCAN(del);
- } else if (*p == '/') {
- p++;
- NEXTNUMBER(q, del);
- n = strtoul(q, 0, 0);
- maxaddr = minaddr;
- mask_address(af, &minaddr, n, 0);
- mask_address(af, &maxaddr, n, 1);
- RESCAN(del);
- } else
- maxaddr = minaddr;
- parse_ports(&p, &minport, &maxport);
- ACLNODE(*tail, act, af, minaddr, maxaddr, minport, maxport);
}
+ foreach_addrrange(&r, add_impbind, &ctx);
SKIPSPC;
if (*p != ',') break;
if (*p) p++;
return;
bad:
- D( fprintf(stderr, "noip(%d): bad acl spec (ignored)\n", getpid()); )
+ D( fprintf(stderr, "noip(%d): bad implicit-bind spec (ignored)\n",
+ getpid()); )
return;
}
+/* Parse implicit-bind instructions from an environment variable VAR,
+ * attaching it to the list.
+ */
+static void parse_impbind_env(const char *var)
+{
+ char *p, *q;
+
+ if ((p = getenv(var)) != 0) {
+ p = q = xstrdup(p);
+ parse_impbind_line(&q);
+ free(p);
+ }
+}
+
/* Parse the autoports configuration directive. Syntax is MIN - MAX. */
static void parse_autoports(char **pp)
{
SKIPSPC;
NEXTNUMBER(q, del); x = strtoul(q, 0, 0); RESCAN(del);
SKIPSPC;
- if (*p != '-') goto bad; p++;
+ if (*p != '-') goto bad;
+ p++;
NEXTNUMBER(q, del); y = strtoul(q, 0, 0); RESCAN(del);
minautoport = x; maxautoport = y;
SKIPSPC; if (*p) goto bad;
return;
}
-/* Parse an ACL from an environment variable VAR, attaching it to the list
- * TAIL. */
-static void parse_acl_env(const char *var, aclnode ***tail)
-{
- char *p, *q;
-
- if ((p = getenv(var)) != 0) {
- p = q = xstrdup(p);
- parse_acl_line(&q, tail);
- free(p);
- }
-}
-
/* Read the configuration from the config file and environment. */
static void readconfig(void)
{
parse_acl_env("NOIP_REALBIND_BEFORE", &bind_tail);
parse_acl_env("NOIP_REALCONNECT_BEFORE", &connect_tail);
+ parse_impbind_env("NOIP_IMPBIND_BEFORE");
if ((p = getenv("NOIP_AUTOPORTS")) != 0) {
p = q = xstrdup(p);
parse_autoports(&q);
parse_acl_line(&p, &bind_tail);
else if (strcmp(cmd, "realconnect") == 0)
parse_acl_line(&p, &connect_tail);
+ else if (strcmp(cmd, "impbind") == 0)
+ parse_impbind_line(&p);
else if (strcmp(cmd, "autoports") == 0)
parse_autoports(&p);
else if (strcmp(cmd, "debug") == 0)
debug = *p ? atoi(p) : 1;
else
- D( fprintf(stderr, "noip: bad config command %s\n", cmd); )
+ D( fprintf(stderr, "noip(%d): bad config command %s\n", pid, cmd); )
}
fclose(fp);
done:
parse_acl_env("NOIP_REALBIND", &bind_tail);
parse_acl_env("NOIP_REALCONNECT", &connect_tail);
+ parse_impbind_env("NOIP_IMPBIND");
parse_acl_env("NOIP_REALBIND_AFTER", &bind_tail);
parse_acl_env("NOIP_REALCONNECT_AFTER", &connect_tail);
+ parse_impbind_env("NOIP_IMPBIND_AFTER");
*bind_tail = 0;
*connect_tail = 0;
+ *impbind_tail = 0;
if (!sockdir) sockdir = getenv("NOIP_SOCKETDIR");
if (!sockdir) {
snprintf(buf, sizeof(buf), "%s/noip-%s", tmpdir(), user());
fprintf(stderr, "noip(%d): realbind acl:\n", pid);
dump_acl(bind_real);
fprintf(stderr, "noip(%d): realconnect acl:\n", pid);
- dump_acl(connect_real); )
+ dump_acl(connect_real);
+ fprintf(stderr, "noip(%d): impbind list:\n", pid);
+ dump_impbind_list(); )
}
/*----- 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 (family_known_p(pf)) {
+ 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;
+
+ 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)) {
+ 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, 0))
return (-1);
} else {
- encode_inet_addr(&sun, sa, WANT_FRESH);
+ encode_inet_addr(&sun, sa, ENCF_FRESH);
sa = SA(&sun);
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 && family_known_p(to->sa_family)) {
+ 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;
+ ssize_t n;
+ Dpid;
- if (msg->msg_name && family_known_p(SA(msg->msg_name)->sa_family)) {
+ 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;
- if (!msg->msg_name)
+ D( fprintf(stderr, "noip(%d): RECVMSG sk=%d msg_flags=%d, ...",
+ pid, sk, msg->msg_flags); )
+
+ 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)
{
- PRESERVING_ERRNO({
- char sabuf[1024];
- socklen_t mylen = sizeof(sabuf);
- if (real_getsockname(sk, SA(sabuf), &mylen))
- return (-1);
+ char sabuf[1024];
+ socklen_t mylen = sizeof(sabuf);
+ int rc;
+ Dpid;
+
+ D( fprintf(stderr, "noip(%d): GETSOCKNAME sk=%d", pid, sk); )
+ rc = real_getsockname(sk, SA(sabuf), &mylen);
+ if (rc >= 0) {
+ D( fprintf(stderr, " -> converting...\n"); )
return_fake_name(SA(sabuf), mylen, sa, len);
- });
- return (0);
+ D( fprintf(stderr, "noip(%d): ... GETSOCKNAME", pid); )
+ }
+ D( dump_addrresult(rc, sa, *len); )
+ return (rc);
}
int getpeername(int sk, struct sockaddr *sa, socklen_t *len)
{
- PRESERVING_ERRNO({
- char sabuf[1024];
- socklen_t mylen = sizeof(sabuf);
- if (real_getpeername(sk, SA(sabuf), &mylen))
- return (-1);
+ char sabuf[1024];
+ socklen_t mylen = sizeof(sabuf);
+ int rc;
+ Dpid;
+
+ D( fprintf(stderr, "noip(%d): GETPEERNAME sk=%d", pid, sk); )
+ 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);
}
int getsockopt(int sk, int lev, int opt, void *p, socklen_t *len)
{
switch (lev) {
- case SOL_IP:
- case SOL_TCP:
- case SOL_UDP:
+ case IPPROTO_IP:
+ case IPPROTO_IPV6:
+ case IPPROTO_TCP:
+ case IPPROTO_UDP:
if (*len > 0)
memset(p, 0, *len);
return (0);
int setsockopt(int sk, int lev, int opt, const void *p, socklen_t len)
{
switch (lev) {
- case SOL_IP:
- case SOL_TCP:
- case SOL_UDP:
+ case IPPROTO_IP:
+ case IPPROTO_IPV6:
+ case IPPROTO_TCP:
+ case IPPROTO_UDP:
return (0);
}
switch (opt) {
~mdw / preload-hacks / blobdiff