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-rw-r--r--source4/lib/socket_wrapper/socket_wrapper.c304
1 files changed, 260 insertions, 44 deletions
diff --git a/source4/lib/socket_wrapper/socket_wrapper.c b/source4/lib/socket_wrapper/socket_wrapper.c
index d95806783d..d9f61f7e3c 100644
--- a/source4/lib/socket_wrapper/socket_wrapper.c
+++ b/source4/lib/socket_wrapper/socket_wrapper.c
@@ -63,7 +63,9 @@
with this format we have 8 chars left for the directory name
*/
-#define SOCKET_FORMAT "%u_%05u"
+#define SOCKET_FORMAT "%c%02X%04X"
+#define SOCKET_TYPE_CHAR_TCP 'T'
+#define SOCKET_TYPE_CHAR_UDP 'U'
static struct sockaddr *sockaddr_dup(const void *data, socklen_t len)
{
@@ -80,6 +82,7 @@ struct socket_info
int type;
int protocol;
int bound;
+ int bcast;
char *path;
char *tmp_path;
@@ -108,45 +111,199 @@ static const char *socket_wrapper_dir(void)
return s;
}
+static unsigned int socket_wrapper_default_iface(void)
+{
+ const char *s = getenv("SOCKET_WRAPPER_DEFAULT_IFACE");
+ if (s) {
+ unsigned int iface;
+ if (sscanf(s, "%u", &iface) == 1) {
+ if (iface >= 1 && iface <= 0xFF) {
+ return iface;
+ }
+ }
+ }
+
+ return 1;/* 127.0.0.1 */
+}
+
static int convert_un_in(const struct sockaddr_un *un, struct sockaddr_in *in, socklen_t *len)
{
+ unsigned int iface;
unsigned int prt;
const char *p;
- int type;
+ char type;
if ((*len) < sizeof(struct sockaddr_in)) {
return 0;
}
- in->sin_family = AF_INET;
- in->sin_port = htons(1025); /* Default to 1025 */
p = strrchr(un->sun_path, '/');
if (p) p++; else p = un->sun_path;
- if (sscanf(p, SOCKET_FORMAT, &type, &prt) == 2) {
- in->sin_port = htons(prt);
+ if (sscanf(p, SOCKET_FORMAT, &type, &iface, &prt) != 3) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (type != SOCKET_TYPE_CHAR_TCP && type != SOCKET_TYPE_CHAR_UDP) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (iface == 0 || iface > 0xFF) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (prt > 0xFFFF) {
+ errno = EINVAL;
+ return -1;
}
- in->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+
+ in->sin_addr.s_addr = htonl((127<<24) | iface);
+ in->sin_port = htons(prt);
+
*len = sizeof(struct sockaddr_in);
return 0;
}
-static int convert_in_un(struct socket_info *si, const struct sockaddr_in *in, struct sockaddr_un *un)
+static int convert_in_un_remote(struct socket_info *si, const struct sockaddr_in *in, struct sockaddr_un *un,
+ int *bcast)
{
- int type = si->type;
- uint16_t prt = ntohs(in->sin_port);
+ char u_type = '\0';
+ char b_type = '\0';
+ char a_type = '\0';
+ char type = '\0';
+ unsigned int addr= ntohl(in->sin_addr.s_addr);
+ unsigned int prt = ntohs(in->sin_port);
+ unsigned int iface;
+ int is_bcast = 0;
+
+ if (bcast) *bcast = 0;
+
+ if (prt == 0) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ switch (si->type) {
+ case SOCK_STREAM:
+ u_type = SOCKET_TYPE_CHAR_TCP;
+ break;
+ case SOCK_DGRAM:
+ u_type = SOCKET_TYPE_CHAR_UDP;
+ a_type = SOCKET_TYPE_CHAR_UDP;
+ b_type = SOCKET_TYPE_CHAR_UDP;
+ break;
+ }
+
+ if (a_type && addr == 0xFFFFFFFF) {
+ /* 255.255.255.255 only udp */
+ is_bcast = 2;
+ type = a_type;
+ iface = socket_wrapper_default_iface();
+ } else if (b_type && addr == 0x7FFFFFFF) {
+ /* 127.255.255.255 only udp */
+ is_bcast = 1;
+ type = b_type;
+ iface = socket_wrapper_default_iface();
+ } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
+ /* 127.0.0.X */
+ is_bcast = 0;
+ type = u_type;
+ iface = (addr & 0x000000FF);
+ } else {
+ errno = ENETUNREACH;
+ return -1;
+ }
+
+ if (bcast) *bcast = is_bcast;
+
+ if (is_bcast) {
+ snprintf(un->sun_path, sizeof(un->sun_path), "%s/EINVAL",
+ socket_wrapper_dir());
+ /* the caller need to do more processing */
+ return 0;
+ }
+
+ snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
+ socket_wrapper_dir(), type, iface, prt);
+
+ return 0;
+}
+
+static int convert_in_un_alloc(struct socket_info *si, const struct sockaddr_in *in, struct sockaddr_un *un,
+ int *bcast)
+{
+ char u_type = '\0';
+ char d_type = '\0';
+ char b_type = '\0';
+ char a_type = '\0';
+ char type = '\0';
+ unsigned int addr= ntohl(in->sin_addr.s_addr);
+ unsigned int prt = ntohs(in->sin_port);
+ unsigned int iface;
+ struct stat st;
+ int is_bcast = 0;
+
+ if (bcast) *bcast = 0;
+
+ switch (si->type) {
+ case SOCK_STREAM:
+ u_type = SOCKET_TYPE_CHAR_TCP;
+ d_type = SOCKET_TYPE_CHAR_TCP;
+ break;
+ case SOCK_DGRAM:
+ u_type = SOCKET_TYPE_CHAR_UDP;
+ d_type = SOCKET_TYPE_CHAR_UDP;
+ a_type = SOCKET_TYPE_CHAR_UDP;
+ b_type = SOCKET_TYPE_CHAR_UDP;
+ break;
+ }
+
+ if (addr == 0) {
+ /* 0.0.0.0 */
+ is_bcast = 0;
+ type = d_type;
+ iface = socket_wrapper_default_iface();
+ } else if (a_type && addr == 0xFFFFFFFF) {
+ /* 255.255.255.255 only udp */
+ is_bcast = 2;
+ type = a_type;
+ iface = socket_wrapper_default_iface();
+ } else if (b_type && addr == 0x7FFFFFFF) {
+ /* 127.255.255.255 only udp */
+ is_bcast = 1;
+ type = b_type;
+ iface = socket_wrapper_default_iface();
+ } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
+ /* 127.0.0.X */
+ is_bcast = 0;
+ type = u_type;
+ iface = (addr & 0x000000FF);
+ } else {
+ errno = EADDRNOTAVAIL;
+ return -1;
+ }
+
+ if (bcast) *bcast = is_bcast;
+
if (prt == 0) {
- struct stat st;
/* handle auto-allocation of ephemeral ports */
- prt = 5000;
- do {
+ for (prt = 5001; prt < 10000; prt++) {
snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
- socket_wrapper_dir(), type, ++prt);
- } while (stat(un->sun_path, &st) == 0 && prt < 10000);
- ((struct sockaddr_in *)si->myname)->sin_port = htons(prt);
- }
+ socket_wrapper_dir(), type, iface, prt);
+ if (stat(un->sun_path, &st) == 0) continue;
+
+ ((struct sockaddr_in *)si->myname)->sin_port = htons(prt);
+ return 0;
+ }
+ errno = ENFILE;
+ return -1;
+ }
+
snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
- socket_wrapper_dir(), type, prt);
+ socket_wrapper_dir(), type, iface, prt);
return 0;
}
@@ -162,7 +319,7 @@ static struct socket_info *find_socket_info(int fd)
}
static int sockaddr_convert_to_un(struct socket_info *si, const struct sockaddr *in_addr, socklen_t in_len,
- struct sockaddr_un *out_addr)
+ struct sockaddr_un *out_addr, int alloc_sock, int *bcast)
{
if (!out_addr)
return 0;
@@ -171,7 +328,19 @@ static int sockaddr_convert_to_un(struct socket_info *si, const struct sockaddr
switch (in_addr->sa_family) {
case AF_INET:
- return convert_in_un(si, (const struct sockaddr_in *)in_addr, out_addr);
+ switch (si->type) {
+ case SOCK_STREAM:
+ case SOCK_DGRAM:
+ break;
+ default:
+ errno = ESOCKTNOSUPPORT;
+ return -1;
+ }
+ if (alloc_sock) {
+ return convert_in_un_alloc(si, (const struct sockaddr_in *)in_addr, out_addr, bcast);
+ } else {
+ return convert_in_un_remote(si, (const struct sockaddr_in *)in_addr, out_addr, bcast);
+ }
case AF_UNIX:
memcpy(out_addr, in_addr, sizeof(*out_addr));
return 0;
@@ -200,6 +369,14 @@ static int sockaddr_convert_from_un(const struct socket_info *si,
switch (family) {
case AF_INET:
+ switch (si->type) {
+ case SOCK_STREAM:
+ case SOCK_DGRAM:
+ break;
+ default:
+ errno = ESOCKTNOSUPPORT;
+ return -1;
+ }
return convert_un_in(in_addr, (struct sockaddr_in *)out_addr, out_len);
case AF_UNIX:
memcpy(out_addr, in_addr, sizeof(*in_addr));
@@ -288,28 +465,46 @@ static int swrap_auto_bind(struct socket_info *si)
struct sockaddr_un un_addr;
struct sockaddr_in in;
int i;
+ char type;
+ int ret;
+ struct stat st;
un_addr.sun_family = AF_UNIX;
+
+ switch (si->type) {
+ case SOCK_STREAM:
+ type = SOCKET_TYPE_CHAR_TCP;
+ break;
+ case SOCK_DGRAM:
+ type = SOCKET_TYPE_CHAR_UDP;
+ break;
+ default:
+ errno = ESOCKTNOSUPPORT;
+ return -1;
+ }
for (i=0;i<1000;i++) {
snprintf(un_addr.sun_path, sizeof(un_addr.sun_path),
"%s/"SOCKET_FORMAT, socket_wrapper_dir(),
- SOCK_DGRAM, i + 10000);
- if (bind(si->fd, (struct sockaddr *)&un_addr,
- sizeof(un_addr)) == 0) {
- si->tmp_path = strdup(un_addr.sun_path);
- si->bound = 1;
- break;
- }
+ type, socket_wrapper_default_iface(), i + 10000);
+ if (stat(un_addr.sun_path, &st) == 0) continue;
+
+ ret = real_bind(si->fd, (struct sockaddr *)&un_addr, sizeof(un_addr));
+ if (ret == -1) return ret;
+
+ si->tmp_path = strdup(un_addr.sun_path);
+ si->bound = 1;
+ break;
}
if (i == 1000) {
+ errno = ENFILE;
return -1;
}
memset(&in, 0, sizeof(in));
in.sin_family = AF_INET;
in.sin_port = htons(i);
- in.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+ in.sin_addr.s_addr = htonl(127<<24 | socket_wrapper_default_iface());
si->myname_len = sizeof(in);
si->myname = sockaddr_dup(&in, si->myname_len);
@@ -328,25 +523,24 @@ int swrap_connect(int s, const struct sockaddr *serv_addr, socklen_t addrlen)
return real_connect(s, serv_addr, addrlen);
}
- /* only allow pseudo loopback connections */
- if (serv_addr->sa_family == AF_INET &&
- ((const struct sockaddr_in *)serv_addr)->sin_addr.s_addr !=
- htonl(INADDR_LOOPBACK)) {
- errno = ENETUNREACH;
- return -1;
- }
-
if (si->bound == 0 && si->domain != AF_UNIX) {
ret = swrap_auto_bind(si);
if (ret == -1) return -1;
}
- ret = sockaddr_convert_to_un(si, (const struct sockaddr *)serv_addr, addrlen, &un_addr);
+ ret = sockaddr_convert_to_un(si, (const struct sockaddr *)serv_addr, addrlen, &un_addr, 0, NULL);
if (ret == -1) return -1;
ret = real_connect(s, (struct sockaddr *)&un_addr,
sizeof(struct sockaddr_un));
+ /* to give better errors */
+ if (serv_addr->sa_family == AF_INET) {
+ if (ret == -1 && errno == ENOENT) {
+ errno = EHOSTUNREACH;
+ }
+ }
+
if (ret == 0) {
si->peername_len = addrlen;
si->peername = sockaddr_dup(serv_addr, addrlen);
@@ -368,12 +562,7 @@ int swrap_bind(int s, const struct sockaddr *myaddr, socklen_t addrlen)
si->myname_len = addrlen;
si->myname = sockaddr_dup(myaddr, addrlen);
- if (myaddr->sa_family == AF_INET &&
- ((const struct sockaddr_in *)myaddr)->sin_addr.s_addr == 0) {
- ((struct sockaddr_in *)si->myname)->sin_addr.s_addr =
- htonl(INADDR_LOOPBACK);
- }
- ret = sockaddr_convert_to_un(si, (const struct sockaddr *)myaddr, addrlen, &un_addr);
+ ret = sockaddr_convert_to_un(si, (const struct sockaddr *)myaddr, addrlen, &un_addr, 1, &si->bcast);
if (ret == -1) return -1;
unlink(un_addr.sun_path);
@@ -501,6 +690,7 @@ ssize_t swrap_sendto(int s, const void *buf, size_t len, int flags, const str
struct sockaddr_un un_addr;
int ret;
struct socket_info *si = find_socket_info(s);
+ int bcast = 0;
if (!si) {
return real_sendto(s, buf, len, flags, to, tolen);
@@ -511,11 +701,37 @@ ssize_t swrap_sendto(int s, const void *buf, size_t len, int flags, const str
if (ret == -1) return -1;
}
- ret = sockaddr_convert_to_un(si, to, tolen, &un_addr);
+ ret = sockaddr_convert_to_un(si, to, tolen, &un_addr, 0, &bcast);
if (ret == -1) return -1;
+ if (bcast) {
+ struct stat st;
+ unsigned int iface;
+ unsigned int prt = ntohs(((const struct sockaddr_in *)to)->sin_port);
+ char type;
+
+ type = SOCKET_TYPE_CHAR_UDP;
+
+ for(iface=0; iface <= 0xFF; iface++) {
+ snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s/"SOCKET_FORMAT,
+ socket_wrapper_dir(), type, iface, prt);
+ if (stat(un_addr.sun_path, &st) != 0) continue;
+
+ /* ignore the any errors in broadcast sends */
+ real_sendto(s, buf, len, flags, (struct sockaddr *)&un_addr, sizeof(un_addr));
+ }
+ return len;
+ }
+
ret = real_sendto(s, buf, len, flags, (struct sockaddr *)&un_addr, sizeof(un_addr));
+ /* to give better errors */
+ if (to->sa_family == AF_INET) {
+ if (ret == -1 && errno == ENOENT) {
+ errno = EHOSTUNREACH;
+ }
+ }
+
return ret;
}
generated by cgit (git 2.34.1) at 2024-11-08 17:29:25 +0000