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path: root/ipsvd/tcpudp.c
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Diffstat (limited to 'ipsvd/tcpudp.c')
-rw-r--r--ipsvd/tcpudp.c120
1 files changed, 58 insertions, 62 deletions
diff --git a/ipsvd/tcpudp.c b/ipsvd/tcpudp.c
index 6e8ec32..9f098c3 100644
--- a/ipsvd/tcpudp.c
+++ b/ipsvd/tcpudp.c
@@ -22,9 +22,9 @@
*
* udp server is hacked up by reusing TCP code. It has the following
* limitation inherent in Unix DGRAM sockets implementation:
- * - local IP address is reptrieved (using recvmsg voodoo) but
+ * - local IP address is retrieved (using recvmsg voodoo) but
* child's socket is not bound to it (bind cannot be called on
- * already bound socket). Thus you still can get outgoing packets
+ * already bound socket). Thus it still can emit outgoing packets
* with wrong sorce IP...
* - don't know how to retrieve ORIGDST for udp.
*/
@@ -100,7 +100,7 @@ enum {
static void connection_status(void)
{
- /* UDP and "only 1 client max" TCP don't need this */
+ /* "only 1 client max" don't need this */
if (cmax > 1)
printf("%s: info: status %u/%u\n", applet_name, cnum, cmax);
}
@@ -131,34 +131,35 @@ int tcpudpsvd_main(int argc, char **argv)
const char *instructs;
char *msg_per_host = NULL;
unsigned len_per_host = len_per_host; /* gcc */
- int need_hostnames, need_remote_ip;
- int tcp;
+#ifndef SSLSVD
+ struct bb_uidgid_t ugid;
+#endif
+ bool need_hostnames, need_remote_ip, tcp;
+ uint16_t local_port;
+ char *local_hostname = NULL;
+ char *remote_hostname = (char*)""; /* "" used if no -h */
+ char *local_addr = local_addr; /* gcc */
+ char *remote_addr = remote_addr; /* gcc */
+ char *remote_ip = remote_addr; /* gcc */
+ len_and_sockaddr *lsa;
+ len_and_sockaddr local, remote;
+ socklen_t sa_len;
int pid;
int sock;
int conn;
unsigned backlog = 20;
- len_and_sockaddr *lsa;
- len_and_sockaddr local, remote;
- uint16_t local_port;
- uint16_t remote_port = remote_port; /* gcc */
- char *local_hostname = NULL;
- char *remote_hostname = (char*)""; /* "" used if no -h */
- char *local_ip = local_ip; /* gcc */
- char *remote_ip = remote_ip; /* gcc */
-#ifndef SSLSVD
- struct bb_uidgid_t ugid;
-#endif
+
tcp = (applet_name[0] == 't');
/* 3+ args, -i at most once, -p implies -h, -v is counter */
opt_complementary = "-3:?:i--i:ph:vv";
#ifdef SSLSVD
- getopt32(argc, argv, "c:C:i:x:u:l:Eb:hpt:vU:/:Z:K:",
+ getopt32(argc, argv, "+c:C:i:x:u:l:Eb:hpt:vU:/:Z:K:",
&str_c, &str_C, &instructs, &instructs, &user, &local_hostname,
&str_b, &str_t, &ssluser, &root, &cert, &key, &verbose
);
#else
- getopt32(argc, argv, "c:C:i:x:u:l:Eb:hpt:v",
+ getopt32(argc, argv, "+c:C:i:x:u:l:Eb:hpt:v",
&str_c, &str_C, &instructs, &instructs, &user, &local_hostname,
&str_b, &str_t, &verbose
);
@@ -213,10 +214,8 @@ int tcpudpsvd_main(int argc, char **argv)
if (option_mask32 & OPT_u)
if (!uidgid_get(&sslugid, ssluser, 1)) {
if (errno) {
- xfunc_exitcode = 100;
bb_perror_msg_and_die("fatal: cannot get user/group: %s", ssluser);
}
- xfunc_exitcode = 111;
bb_error_msg_and_die("fatal: unknown user/group '%s'", ssluser);
}
if (!cert) cert = "./cert.pem";
@@ -244,7 +243,8 @@ int tcpudpsvd_main(int argc, char **argv)
lsa = xhost2sockaddr(argv[0], local_port);
sock = xsocket(lsa->sa.sa_family, tcp ? SOCK_STREAM : SOCK_DGRAM, 0);
setsockopt_reuseaddr(sock);
- xbind(sock, &lsa->sa, lsa->len);
+ sa_len = lsa->len; /* I presume sockaddr len stays the same */
+ xbind(sock, &lsa->sa, sa_len);
if (tcp)
xlisten(sock, backlog);
else /* udp: needed for recv_from_to to work: */
@@ -260,9 +260,7 @@ int tcpudpsvd_main(int argc, char **argv)
#endif
if (verbose) {
- /* we do it only for ":port" cosmetics... oh well */
- char *addr = xmalloc_sockaddr2dotted(&lsa->sa, lsa->len);
-
+ char *addr = xmalloc_sockaddr2dotted(&lsa->sa, sa_len);
printf("%s: info: listening on %s", applet_name, addr);
free(addr);
#ifndef SSLSVD
@@ -287,10 +285,14 @@ int tcpudpsvd_main(int argc, char **argv)
again2:
sig_unblock(SIGCHLD);
if (tcp) {
- remote.len = lsa->len;
+ remote.len = sa_len;
conn = accept(sock, &remote.sa, &remote.len);
- } else
- conn = recv_from_to(sock, NULL, 0, MSG_PEEK, &remote.sa, &local.sa, lsa->len);
+ } else {
+ /* In case we won't be able to recover local below.
+ * Also sets port - recv_from_to is unable to do it. */
+ local = *lsa;
+ conn = recv_from_to(sock, NULL, 0, MSG_PEEK, &remote.sa, &local.sa, sa_len);
+ }
sig_block(SIGCHLD);
if (conn < 0) {
if (errno != EINTR)
@@ -302,7 +304,7 @@ int tcpudpsvd_main(int argc, char **argv)
if (max_per_host) {
/* Drop connection immediately if cur_per_host > max_per_host
* (minimizing load under SYN flood) */
- remote_ip = xmalloc_sockaddr2dotted_noport(&remote.sa, lsa->len);
+ remote_ip = xmalloc_sockaddr2dotted_noport(&remote.sa, sa_len);
cur_per_host = ipsvd_perhost_add(remote_ip, max_per_host, &hccp);
if (cur_per_host > max_per_host) {
/* ipsvd_perhost_add detected that max is exceeded
@@ -319,16 +321,21 @@ int tcpudpsvd_main(int argc, char **argv)
if (!tcp) {
/* Voodoo magic: making udp sockets each receive its own
- * packets is not trivial */
+ * packets is not trivial, and I still not sure
+ * I do it 100% right.
+ * 1) we have to do it before fork()
+ * 2) order is important - is it right now? */
- /* Make plain write work for this socket by supplying default
+ /* Make plain write/send work for this socket by supplying default
* destination address. This also restricts incoming packets
* to ones coming from this remote IP. */
- xconnect(0, &remote.sa, lsa->len);
+ xconnect(0, &remote.sa, sa_len);
+ /* hole? at this point we have no wildcard udp socket...
+ * can this cause clients to get "port unreachable" icmp? */
/* Open new non-connected UDP socket for further clients */
sock = xsocket(lsa->sa.sa_family, tcp ? SOCK_STREAM : SOCK_DGRAM, 0);
setsockopt_reuseaddr(sock);
- xbind(sock, &lsa->sa, lsa->len);
+ xbind(sock, &lsa->sa, sa_len);
socket_want_pktinfo(sock);
}
@@ -355,50 +362,44 @@ int tcpudpsvd_main(int argc, char **argv)
if (tcp)
close(sock);
- if (need_remote_ip) {
- if (!max_per_host)
- remote_ip = xmalloc_sockaddr2dotted_noport(&remote.sa, lsa->len);
- /* else it is already done */
- remote_port = get_nport(&remote.sa);
- remote_port = ntohs(remote_port);
- }
+ if (need_remote_ip)
+ remote_addr = xmalloc_sockaddr2dotted(&remote.sa, sa_len);
if (need_hostnames) {
if (option_mask32 & OPT_h) {
- remote_hostname = xmalloc_sockaddr2host(&remote.sa, lsa->len);
+ remote_hostname = xmalloc_sockaddr2host_noport(&remote.sa, sa_len);
if (!remote_hostname) {
- bb_error_msg("warning: cannot look up hostname for %s", remote_ip);
+ bb_error_msg("warning: cannot look up hostname for %s", remote_addr);
remote_hostname = (char*)"";
}
}
/* Find out local IP peer connected to.
* Errors ignored (I'm not paranoid enough to imagine kernel
* which doesn't know local IP). */
- if (tcp)
+ if (tcp) {
+ local.len = sa_len;
getsockname(0, &local.sa, &local.len);
- local_ip = xmalloc_sockaddr2dotted_noport(&local.sa, lsa->len);
- local_port = get_nport(&local.sa);
- local_port = ntohs(local_port);
+ }
+ local_addr = xmalloc_sockaddr2dotted(&local.sa, sa_len);
if (!local_hostname) {
- local_hostname = xmalloc_sockaddr2host_noport(&local.sa, lsa->len);
+ local_hostname = xmalloc_sockaddr2host_noport(&local.sa, sa_len);
if (!local_hostname)
- bb_error_msg_and_die("warning: cannot look up hostname for %s"+9, local_ip);
+ bb_error_msg_and_die("warning: cannot look up hostname for %s"+9, local_addr);
}
}
if (verbose) {
pid = getpid();
- printf("%s: info: pid %u from %s\n", applet_name, pid, remote_ip);
+ printf("%s: info: pid %u from %s\n", applet_name, pid, remote_addr);
if (max_per_host)
printf("%s: info: concurrency %u %s %u/%u\n",
applet_name, pid, remote_ip, cur_per_host, max_per_host);
- printf("%s: info: start %u %s:%s :%s:%s:%u\n",
+ printf("%s: info: start %u %s:%s :%s:%s\n",
applet_name, pid,
- local_hostname, local_ip,
- remote_hostname, remote_ip, (unsigned)remote_port);
+ local_hostname, local_addr,
+ remote_hostname, remote_addr);
}
-// TODO: stop splitiing port# from IP?
if (!(option_mask32 & OPT_E)) {
/* setup ucspi env */
const char *proto = tcp ? "TCP" : "UDP";
@@ -408,19 +409,14 @@ int tcpudpsvd_main(int argc, char **argv)
* an outbond connection to local handler, and it needs
* to know where it originally tried to connect */
if (tcp && getsockopt(0, SOL_IP, SO_ORIGINAL_DST, &lsa->sa, &lsa->len) == 0) {
- char *ip = xmalloc_sockaddr2dotted_noport(&lsa->sa, lsa->len);
- unsigned port = get_nport(&lsa->sa);
- port = ntohs(port);
- xsetenv("TCPORIGDSTIP", ip);
- xsetenv("TCPORIGDSTPORT", utoa(port));
- free(ip);
+ char *addr = xmalloc_sockaddr2dotted(&lsa->sa, sa_len);
+ xsetenv("TCPORIGDSTADDR", addr);
+ free(addr);
}
xsetenv("PROTO", proto);
- xsetenv_proto(proto, "LOCALIP", local_ip);
- xsetenv_proto(proto, "LOCALPORT", utoa(local_port));
+ xsetenv_proto(proto, "LOCALADDR", local_addr);
xsetenv_proto(proto, "LOCALHOST", local_hostname);
- xsetenv_proto(proto, "REMOTEIP", remote_ip);
- xsetenv_proto(proto, "REMOTEPORT", utoa(remote_port));
+ xsetenv_proto(proto, "REMOTEADDR", remote_addr);
if (option_mask32 & OPT_h) {
xsetenv_proto(proto, "REMOTEHOST", remote_hostname);
}
generated by cgit v1.1 at 2024-12-24 17:38:42 +0000