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ipsvd: use IP:PORT syntax for environment vars. Pros:

Browse Source 
1. it's saner (matches internal libc sockaddr abstraction).
2. it's smaller.
Cons: not compatible with smarden's ipsvd.
Fix IPv6 define typos.
Stop interpreting options in prog's args.
Code size -162 bytes.
This commit is contained in:
Denis Vlasenko 2007-04-04 10:16:15 +00:00
parent 02fd66885c
commit 64a15124e7
2 changed files with 74 additions and 71 deletions
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120
ipsvd/tcpudp.c
View File

@ -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);
}

25
ipsvd/udp_io.c
View File

@ -18,12 +18,13 @@ socket_want_pktinfo(int fd)
#ifdef IP_PKTINFO
setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &const_int_1, sizeof(int));
#endif
#ifdef IPV6_PKTINFO
#if ENABLE_FEATURE_IPV6 && defined(IPV6_PKTINFO)
setsockopt(fd, IPPROTO_IPV6, IPV6_PKTINFO, &const_int_1, sizeof(int));
#endif
}
#ifdef UNUSED
ssize_t
send_to_from(int fd, void *buf, size_t len, int flags,
const struct sockaddr *from, const struct sockaddr *to,
@ -34,8 +35,11 @@ send_to_from(int fd, void *buf, size_t len, int flags,
#else
struct iovec iov[1];
struct msghdr msg;
char cbuf[LSA_SIZEOF_SA];
/* actually, max(sizeof(in_pktinfo),sizeof(in6_pktinfo)) */
char cbuf[sizeof(struct in_pktinfo)
#if ENABLE_FEATURE_IPV6 && defined(IPV6_PKTINFO)
| sizeof(struct in6_pktinfo) /* (a|b) is poor man's max(a,b) */
#endif
];
struct cmsghdr* cmsgptr;
if (from->sa_family != AF_INET
@ -73,11 +77,11 @@ send_to_from(int fd, void *buf, size_t len, int flags,
/* pktptr->ipi_ifindex = 0; -- already done by memset(cbuf...) */
pktptr->ipi_spec_dst = ((struct sockaddr_in*)from)->sin_addr;
}
#if ENABLE_FEATURE_IPV6 && defined(IP6_PKTINFO)
#if ENABLE_FEATURE_IPV6 && defined(IPV6_PKTINFO)
else if (to->sa_family == AF_INET6 && from->sa_family == AF_INET6) {
struct in6_pktinfo *pktptr;
cmsgptr->cmsg_level = IPPROTO_IPV6;
cmsgptr->cmsg_type = IP6_PKTINFO;
cmsgptr->cmsg_type = IPV6_PKTINFO;
cmsgptr->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
pktptr = (struct in6_pktinfo *)(CMSG_DATA(cmsgptr));
/* pktptr->ipi6_ifindex = 0; -- already done by memset(cbuf...) */
@ -87,8 +91,12 @@ send_to_from(int fd, void *buf, size_t len, int flags,
return sendmsg(fd, &msg, flags);
#endif
}
#endif /* UNUSED */
/* NB: this will never set port# in *to! */
/* NB: this will never set port# in 'to'!
* _Only_ IP/IPv6 address part of 'to' is _maybe_ modified.
* Typical usage is to preinit it with "default" value
* before calling recv_from_to(). */
ssize_t
recv_from_to(int fd, void *buf, size_t len, int flags,
struct sockaddr *from, struct sockaddr *to,
@ -123,7 +131,6 @@ recv_from_to(int fd, void *buf, size_t len, int flags,
return recv_length;
/* Here we try to retrieve destination IP and memorize it */
memset(to, 0, sa_size);
for (cmsgptr = CMSG_FIRSTHDR(&msg);
cmsgptr != NULL;
cmsgptr = CMSG_NXTHDR(&msg, cmsgptr)
@ -138,9 +145,9 @@ recv_from_to(int fd, void *buf, size_t len, int flags,
#undef pktinfo
break;
}
#if ENABLE_FEATURE_IPV6 && defined(IP6_PKTINFO)
#if ENABLE_FEATURE_IPV6 && defined(IPV6_PKTINFO)
if (cmsgptr->cmsg_level == IPPROTO_IPV6
&& cmsgptr->cmsg_type == IP6_PKTINFO
&& cmsgptr->cmsg_type == IPV6_PKTINFO
) {
#define pktinfo(cmsgptr) ( (struct in6_pktinfo*)(CMSG_DATA(cmsgptr)) )
to->sa_family = AF_INET6;