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net.c
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net.c
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/*
* net.c -- handles:
* all raw network i/o
*/
/*
* This is hereby released into the public domain.
* Robey Pointer, robey@netcom.com
*
* Changes after Feb 23, 1999 Copyright Eggheads Development Team
*
* Copyright (C) 1999 - 2017 Eggheads Development Team
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <fcntl.h>
#include "main.h"
#include <limits.h>
#include <string.h>
#include <netdb.h>
#include <sys/socket.h>
#if HAVE_SYS_SELECT_H
# include <sys/select.h>
#endif
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <setjmp.h>
#ifdef TLS
# include <openssl/err.h>
#endif
#ifndef HAVE_GETDTABLESIZE
# ifdef FD_SETSIZE
# define getdtablesize() FD_SETSIZE
# else
# define getdtablesize() 200
# endif
#endif
extern struct dcc_t *dcc;
extern int backgrd, use_stderr, resolve_timeout, dcc_total;
extern unsigned long otraffic_irc_today, otraffic_bn_today, otraffic_dcc_today,
otraffic_filesys_today, otraffic_trans_today,
otraffic_unknown_today;
char natip[121] = ""; /* Public IPv4 to report for systems behind NAT */
char listen_ip[121] = ""; /* IP (or hostname) for listening sockets */
char vhost[121] = ""; /* IPv4 vhost for outgoing connections */
#ifdef IPV6
char vhost6[121] = ""; /* IPv6 vhost for outgoing connections */
int pref_af = 0; /* Prefer IPv6 over IPv4? */
#endif
char firewall[121] = ""; /* Socks server for firewall. */
int firewallport = 1080; /* Default port of socks 4/5 firewalls. */
char botuser[11] = "eggdrop"; /* Username of the user running the bot. */
int dcc_sanitycheck = 0; /* Do some sanity checking on dcc connections. */
sock_list *socklist = NULL; /* Enough to be safe. */
sigjmp_buf alarmret; /* Env buffer for alarm() returns. */
/* Types of proxies */
#define PROXY_SOCKS 1
#define PROXY_SUN 2
/* I need an UNSIGNED long for dcc type stuff
*/
IP my_atoul(char *s)
{
IP ret = 0;
while ((*s >= '0') && (*s <= '9')) {
ret *= 10;
ret += ((*s) - '0');
s++;
}
return ret;
}
int expmem_net()
{
int i, tot = 0;
struct threaddata *td = threaddata();
for (i = 0; i < td->MAXSOCKS; i++) {
if (!(td->socklist[i].flags & (SOCK_UNUSED | SOCK_TCL))) {
if (td->socklist[i].handler.sock.inbuf != NULL)
tot += strlen(td->socklist[i].handler.sock.inbuf) + 1;
if (td->socklist[i].handler.sock.outbuf != NULL)
tot += td->socklist[i].handler.sock.outbuflen;
}
}
return tot;
}
/* Extract the IP address from a sockaddr struct and convert it
* to presentation format.
*/
char *iptostr(struct sockaddr *sa)
{
#ifdef IPV6
static char s[INET6_ADDRSTRLEN] = "";
if (sa->sa_family == AF_INET6)
inet_ntop(AF_INET6, &((struct sockaddr_in6 *)sa)->sin6_addr,
s, sizeof s);
else
#else
static char s[sizeof "255.255.255.255"] = "";
#endif
inet_ntop(AF_INET, &((struct sockaddr_in *)sa)->sin_addr.s_addr, s,
sizeof s);
return s;
}
/* Fills in a sockname struct with the given server and port. If the string
* pointed by src isn't an IP address and allowres is not null, the function
* will assume it's a hostname and will attempt to resolve it. This is
* convenient, but you should use the async dns functions where possible, to
* avoid blocking the bot while the lookup is performed.
*/
int setsockname(sockname_t *addr, char *src, int port, int allowres)
{
struct hostent *hp;
int af = AF_UNSPEC;
#ifdef IPV6
int pref;
/* Clean start */
egg_bzero(addr, sizeof(sockname_t));
af = pref = pref_af ? AF_INET6 : AF_INET;
if (pref == AF_INET) {
if (!egg_inet_aton(src, &addr->addr.s4.sin_addr))
af = AF_INET6;
} else {
if (inet_pton(af, src, &addr->addr.s6.sin6_addr) != 1)
af = AF_INET;
}
if (af != pref)
if (((af == AF_INET6) &&
(inet_pton(af, src, &addr->addr.s6.sin6_addr) != 1)) ||
((af == AF_INET) &&
!egg_inet_aton(src, &addr->addr.s4.sin_addr)))
af = AF_UNSPEC;
if (af == AF_UNSPEC && allowres) {
/* src is a hostname. Attempt to resolve it.. */
if (!sigsetjmp(alarmret, 1)) {
alarm(resolve_timeout);
hp = gethostbyname2(src, pref_af ? AF_INET6 : AF_INET);
if (!hp)
hp = gethostbyname2(src, pref_af ? AF_INET : AF_INET6);
alarm(0);
} else
hp = NULL;
if (hp) {
if (hp->h_addrtype == AF_INET)
egg_memcpy(&addr->addr.s4.sin_addr, hp->h_addr, hp->h_length);
else
egg_memcpy(&addr->addr.s6.sin6_addr, hp->h_addr, hp->h_length);
af = hp->h_addrtype;
}
}
addr->family = (af == AF_UNSPEC) ? pref : af;
addr->addr.sa.sa_family = addr->family;
if (addr->family == AF_INET6) {
addr->addrlen = sizeof(struct sockaddr_in6);
addr->addr.s6.sin6_port = htons(port);
addr->addr.s6.sin6_family = AF_INET6;
} else {
addr->addrlen = sizeof(struct sockaddr_in);
addr->addr.s4.sin_port = htons(port);
addr->addr.s4.sin_family = AF_INET;
}
#else
int i, count;
egg_bzero(addr, sizeof(sockname_t));
/* If it's not an IPv4 address, check if its IPv6 (so it can fail/error
* appropriately). If it's not, and allowres is 1, use gethostbyname()
* to try and resolve. If allowres is 0, return AF_UNSPEC to allow
* dns.mod to do it's thing.
* Also, because we can't be sure inet_pton exists on the system, we
* have to resort to hackishly counting :s to see if its IPv6 or not.
* Go internet.
*/
if (!inet_pton(AF_INET, src, &addr->addr.s4.sin_addr)) {
/* Boring way to count :s */
count = 0;
for (i = 0; src[i]; i++) {
if (src[i] == ':') {
count++;
if (count == 2)
break;
}
}
if (count > 1) {
putlog(LOG_MISC, "*", "ERROR: This looks like an IPv6 address, \
but this Eggdrop was not compiled with IPv6 support.");
af = AF_UNSPEC;
}
else if (allowres) {
/* src is a hostname. Attempt to resolve it.. */
if (!sigsetjmp(alarmret, 1)) {
alarm(resolve_timeout);
hp = gethostbyname(src);
alarm(0);
} else
hp = NULL;
if (hp) {
egg_memcpy(&addr->addr.s4.sin_addr, hp->h_addr, hp->h_length);
af = hp->h_addrtype;
}
} else
af = AF_UNSPEC;
} else
af = AF_INET;
addr->family = addr->addr.s4.sin_family = AF_INET;
addr->addr.sa.sa_family = addr->family;
addr->addrlen = sizeof(struct sockaddr_in);
addr->addr.s4.sin_port = htons(port);
#endif
return af;
}
/* Get socket address to bind to for outbound connections
*/
void getvhost(sockname_t *addr, int af)
{
char *h = NULL;
if (af == AF_INET)
h = vhost;
#ifdef IPV6
else
h = vhost6;
#endif
if (setsockname(addr, (h ? h : ""), 0, 1) != af)
setsockname(addr, (af == AF_INET ? "0" : "::"), 0, 0);
/* Remember this 'self-lookup failed' thingie?
I have good news - you won't see it again ;) */
}
/* Sets/Unsets options for a specific socket.
*
* Returns: 0 - on success
* -1 - socket not found
* -2 - illegal operation
*/
int sockoptions(int sock, int operation, int sock_options)
{
int i;
struct threaddata *td = threaddata();
for (i = 0; i < td->MAXSOCKS; i++)
if ((td->socklist[i].sock == sock) &&
!(td->socklist[i].flags & SOCK_UNUSED)) {
if (operation == EGG_OPTION_SET)
td->socklist[i].flags |= sock_options;
else if (operation == EGG_OPTION_UNSET)
td->socklist[i].flags &= ~sock_options;
else
return -2;
return 0;
}
return -1;
}
/* Return a free entry in the socket entry
*/
int allocsock(int sock, int options)
{
int i;
struct threaddata *td = threaddata();
for (i = 0; i < td->MAXSOCKS; i++) {
if (td->socklist[i].flags & SOCK_UNUSED) {
/* yay! there is table space */
td->socklist[i].handler.sock.inbuf = NULL;
td->socklist[i].handler.sock.outbuf = NULL;
td->socklist[i].handler.sock.inbuflen = 0;
td->socklist[i].handler.sock.outbuflen = 0;
td->socklist[i].flags = options;
td->socklist[i].sock = sock;
#ifdef TLS
td->socklist[i].ssl = 0;
#endif
return i;
}
}
/* Try again if enlarging socketlist works */
if (increase_socks_max())
return -1;
else
return allocsock(sock, options);
}
/* Return a free entry in the socket entry for a tcl socket
*
* alloctclsock() can be called by Tcl threads
*/
int alloctclsock(register int sock, int mask, Tcl_FileProc *proc, ClientData cd)
{
int f = -1;
register int i;
struct threaddata *td = threaddata();
for (i = 0; i < td->MAXSOCKS; i++) {
if (td->socklist[i].flags & SOCK_UNUSED) {
if (f == -1)
f = i;
} else if ((td->socklist[i].flags & SOCK_TCL) &&
td->socklist[i].sock == sock) {
f = i;
break;
}
}
if (f != -1) {
td->socklist[f].sock = sock;
td->socklist[f].flags = SOCK_TCL;
td->socklist[f].handler.tclsock.mask = mask;
td->socklist[f].handler.tclsock.proc = proc;
td->socklist[f].handler.tclsock.cd = cd;
return f;
}
/* Try again if enlarging socketlist works */
if (increase_socks_max())
return -1;
else
return alloctclsock(sock, mask, proc, cd);
}
/* Request a normal socket for i/o
*/
void setsock(int sock, int options)
{
int i = allocsock(sock, options), parm;
struct threaddata *td = threaddata();
if (i == -1) {
putlog(LOG_MISC, "*", "Sockettable full.");
return;
}
if (((sock != STDOUT) || backgrd) && !(td->socklist[i].flags & SOCK_NONSOCK)) {
parm = 1;
setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &parm, sizeof(int));
parm = 0;
setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *) &parm, sizeof(int));
}
if (options & SOCK_LISTEN) {
/* Tris says this lets us grab the same port again next time */
parm = 1;
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *) &parm, sizeof(int));
}
/* Yay async i/o ! */
fcntl(sock, F_SETFL, O_NONBLOCK);
}
int getsock(int af, int options)
{
int sock = socket(af, SOCK_STREAM, 0);
if (sock >= 0)
setsock(sock, options);
else
putlog(LOG_MISC, "*", "Warning: Can't create new socket: %s!",
strerror(errno));
return sock;
}
/* Done with a socket
*/
void killsock(register int sock)
{
register int i;
struct threaddata *td = threaddata();
/* Ignore invalid sockets. */
if (sock < 0)
return;
for (i = 0; i < td->MAXSOCKS; i++) {
if ((td->socklist[i].sock == sock) && !(td->socklist[i].flags & SOCK_UNUSED)) {
if (!(td->socklist[i].flags & SOCK_TCL)) { /* nothing to free for tclsocks */
#ifdef TLS
if (td->socklist[i].ssl) {
SSL_shutdown(td->socklist[i].ssl);
nfree(SSL_get_app_data(td->socklist[i].ssl));
SSL_free(td->socklist[i].ssl);
td->socklist[i].ssl = NULL;
}
#endif
close(td->socklist[i].sock);
if (td->socklist[i].handler.sock.inbuf != NULL) {
nfree(td->socklist[i].handler.sock.inbuf);
td->socklist[i].handler.sock.inbuf = NULL;
}
if (td->socklist[i].handler.sock.outbuf != NULL) {
nfree(td->socklist[i].handler.sock.outbuf);
td->socklist[i].handler.sock.outbuf = NULL;
td->socklist[i].handler.sock.outbuflen = 0;
}
}
td->socklist[i].flags = SOCK_UNUSED;
return;
}
}
putlog(LOG_MISC, "*", "Warning: Attempt to kill un-allocated socket %d!", sock);
}
/* Done with a tcl socket
*
* killtclsock() can be called by Tcl threads
*/
void killtclsock(register int sock)
{
register int i;
struct threaddata *td = threaddata();
if (sock < 0)
return;
for (i = 0; i < td->MAXSOCKS; i++) {
if ((td->socklist[i].flags & SOCK_TCL) && td->socklist[i].sock == sock) {
td->socklist[i].flags = SOCK_UNUSED;
return;
}
}
}
/* Send connection request to proxy
*/
static int proxy_connect(int sock, sockname_t *addr)
{
sockname_t name;
char host[121], s[256];
int i, port, proxy;
if (!firewall[0])
return -2;
#ifdef IPV6
if (addr->family == AF_INET6) {
putlog(LOG_MISC, "*", "Eggdrop doesn't support IPv6 connections "
"through proxies yet.");
return -1;
}
#endif
if (firewall[0] == '!') {
proxy = PROXY_SUN;
strncpyz(host, &firewall[1], sizeof host);
} else {
proxy = PROXY_SOCKS;
strcpy(host, firewall);
}
port = addr->addr.s4.sin_port;
setsockname(&name, host, firewallport, 1);
if (connect(sock, &name.addr.sa, name.addrlen) < 0 && errno != EINPROGRESS)
return -1;
if (proxy == PROXY_SOCKS) {
for (i = 0; i < threaddata()->MAXSOCKS; i++)
if (!(socklist[i].flags & SOCK_UNUSED) && socklist[i].sock == sock)
socklist[i].flags |= SOCK_PROXYWAIT; /* drummer */
egg_memcpy(host, &addr->addr.s4.sin_addr.s_addr, 4);
egg_snprintf(s, sizeof s, "\004\001%c%c%c%c%c%c%s", port % 256,
(port >> 8) % 256, host[0], host[1], host[2], host[3], botuser);
tputs(sock, s, strlen(botuser) + 9); /* drummer */
} else if (proxy == PROXY_SUN) {
inet_ntop(AF_INET, &addr->addr.s4.sin_addr, host, sizeof host);
egg_snprintf(s, sizeof s, "%s %d\n", host, port);
tputs(sock, s, strlen(s)); /* drummer */
}
return sock;
}
/* Starts a connection attempt through a socket
*
* The server address should be filled in addr by setsockname() or by the
* non-blocking dns functions and setsnport().
*
* returns < 0 if connection refused:
* -1 strerror() type error
*/
int open_telnet_raw(int sock, sockname_t *addr)
{
sockname_t name;
socklen_t res_len;
fd_set sockset;
struct timeval tv;
int i, rc, res;
getvhost(&name, addr->family);
if (bind(sock, &name.addr.sa, name.addrlen) < 0) {
return -1;
}
for (i = 0; i < threaddata()->MAXSOCKS; i++) {
if (!(socklist[i].flags & SOCK_UNUSED) && (socklist[i].sock == sock))
socklist[i].flags = (socklist[i].flags & ~SOCK_VIRTUAL) | SOCK_CONNECT;
}
if (addr->family == AF_INET && firewall[0])
return proxy_connect(sock, addr);
rc = connect(sock, &addr->addr.sa, addr->addrlen);
if (rc < 0) {
if (errno == EINPROGRESS) {
/* Async connection... don't return socket descriptor
* until after we confirm if it was successful or not */
tv.tv_sec = 1;
tv.tv_usec = 0;
FD_ZERO(&sockset);
FD_SET(sock, &sockset);
select(sock + 1, &sockset, NULL, NULL, &tv);
res_len = sizeof(res);
getsockopt(sock, SOL_SOCKET, SO_ERROR, &res, &res_len);
if (res == 115)
return sock; // This could probably fail somewhere
if (res == 111) {
debug1("net: attempted socket connection refused: %s", iptostr(&addr->addr.sa));
return -4;
}
if (res != 0) {
debug1("net: getsockopt error %d", res);
return -1;
}
return sock; /* async success! */
}
else {
return -1;
}
}
return sock;
}
/* Ordinary non-binary connection attempt
* Return values:
* >=0: connect successful, returned is the socket number
* -1: look at errno or use strerror()
* -2: lookup failed or server is not a valid IP string
* -3: could not allocate socket
* -4: connection failed
*/
int open_telnet(int idx, char *server, int port)
{
int ret;
ret = setsockname(&dcc[idx].sockname, server, port, 1);
if (ret == AF_UNSPEC)
return -2;
dcc[idx].port = port;
dcc[idx].sock = getsock(ret, 0);
if (dcc[idx].sock < 0)
return -3;
ret = open_telnet_raw(dcc[idx].sock, &dcc[idx].sockname);
if (ret < 0) {
if (findidx(dcc[idx].sock) >= 0) {
killsock(dcc[idx].sock);
}
}
return ret;
}
/* Returns a socket number for a listening socket that will accept any
* connection on the given address. The address can be filled in by
* setsockname().
*/
int open_address_listen(sockname_t *addr)
{
int sock = 0;
sock = getsock(addr->family, SOCK_LISTEN);
if (sock < 0)
return -1;
#if defined IPV6 && IPV6_V6ONLY
if (addr->family == AF_INET6) {
int on = 0;
setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (char *) &on, sizeof(on));
}
#endif
if (bind(sock, &addr->addr.sa, addr->addrlen) < 0) {
killsock(sock);
return -2;
}
if (getsockname(sock, &addr->addr.sa, &addr->addrlen) < 0) {
killsock(sock);
return -1;
}
if (listen(sock, 1) < 0) {
killsock(sock);
return -1;
}
return sock;
}
/* Returns a socket number for a listening socket that will accept any
* connection -- port # is returned in port
*/
int open_listen(int *port)
{
int sock;
sockname_t name;
(void) setsockname(&name, listen_ip, *port, 1);
sock = open_address_listen(&name);
if (name.addr.sa.sa_family == AF_INET)
*port = ntohs(name.addr.s4.sin_port);
#ifdef IPV6
else
*port = ntohs(name.addr.s6.sin6_port);
#endif
return sock;
}
/* Short routine to answer a connect received on a listening socket.
* Returned is the new socket.
* If port is not NULL, it points to an integer to hold the port number
* of the caller.
*/
int answer(int sock, sockname_t *caller, unsigned short *port, int binary)
{
int new_sock;
caller->addrlen = sizeof(caller->addr);
new_sock = accept(sock, &caller->addr.sa, &caller->addrlen);
if (new_sock < 0)
return -1;
caller->family = caller->addr.sa.sa_family;
if (port) {
if (caller->family == AF_INET)
*port = ntohs(caller->addr.s4.sin_port);
#ifdef IPV6
else
*port = ntohs(caller->addr.s6.sin6_port);
#endif
}
setsock(new_sock, (binary ? SOCK_BINARY : 0));
return new_sock;
}
int getdccaddr(sockname_t *addr, char *s, size_t l)
{
return getdccfamilyaddr(addr, s, l, AF_UNSPEC);
}
/* Get DCC compatible address for a client to connect (e.g. 1660944385)
* If addr is not NULL, it should point to the listening socket's address.
* Otherwise, this function will try to figure out the public address of the
* machine, using listen_ip and natip. If restrict_af is set, it will limit
* the possible IPs to the specified family. The result is a string useable
* for DCC requests
*/
int getdccfamilyaddr(sockname_t *addr, char *s, size_t l, int restrict_af)
{
char h[121];
sockname_t name, *r = &name;
int af = AF_UNSPEC;
#ifdef IPV6
IP ip = 0;
#endif
if (addr)
r = addr;
else
setsockname(r, listen_ip, 0, 1);
if (
#ifdef IPV6
((r->family == AF_INET6) &&
IN6_IS_ADDR_UNSPECIFIED(&r->addr.s6.sin6_addr)) ||
#endif
(r->family == AF_INET && !r->addr.s4.sin_addr.s_addr)) {
/* We can't send :: or 0.0.0.0 for dcc, so try
to figure out some real address */
#ifdef IPV6
/* If it's listening on an IPv6 :: address,
try using vhost6 as the source IP */
if (pref_af && (r->family == AF_INET6) && (restrict_af != AF_INET)) {
if (inet_pton(AF_INET6, vhost6, &r->addr.s6.sin6_addr) != 1) {
r = &name;
gethostname(h, sizeof h);
setsockname(r, h, 0, 1);
if (r->family == AF_INET) {
/* setsockname tries to resolve both ipv4 and ipv6. ipv4 dns
resolution comes later in precedence, so if we get an ipv4
back, reset it to the original addr struct and try
again */
if (addr) {
r = addr;
} else {
setsockname(r, listen_ip, 0, 1);
}
af = AF_INET;
}
}
}
#endif
/* If IPv6 didn't work, or it's listening on an IPv4
0.0.0.0 address, try using vhost4 as the source */
if ((
#ifdef IPV6
!pref_af ||
#endif
af) && (restrict_af != AF_INET6)) {
if (!egg_inet_aton(vhost, &r->addr.s4.sin_addr)) {
/* And if THAT fails, try DNS resolution of hostname */
r = &name;
gethostname(h, sizeof h);
setsockname(r, h, 0, 1);
}
}
}
if (
#ifdef IPV6
((r->family == AF_INET6) &&
IN6_IS_ADDR_UNSPECIFIED(&r->addr.s6.sin6_addr)) ||
((r->family == AF_INET6) && (restrict_af == AF_INET)) ||
((r->family == AF_INET) && (restrict_af == AF_INET6)) ||
#endif
(!natip[0] && (r->family == AF_INET) && !r->addr.s4.sin_addr.s_addr))
return 0;
#ifdef IPV6
if (r->family == AF_INET6) {
if (IN6_IS_ADDR_V4MAPPED(&r->addr.s6.sin6_addr) ||
IN6_IS_ADDR_UNSPECIFIED(&r->addr.s6.sin6_addr)) {
egg_memcpy(&ip, r->addr.s6.sin6_addr.s6_addr + 12, sizeof ip);
egg_snprintf(s, l, "%lu", natip[0] ? iptolong(inet_addr(natip)) :
ntohl(ip));
} else
inet_ntop(AF_INET6, &r->addr.s6.sin6_addr, s, l);
} else
#endif
egg_snprintf(s, l, "%lu", natip[0] ? iptolong(inet_addr(natip)) :
ntohl(r->addr.s4.sin_addr.s_addr));
return 1;
}
/* Builds the fd_sets for select(). Eggdrop only cares about readable
* sockets, but tcl also cares for writable/exceptions.
* preparefdset() can be called by Tcl Threads
*/
int preparefdset(fd_set *fd, sock_list *slist, int slistmax, int tclonly, int tclmask)
{
int fdtmp, i, foundsocks = 0;
FD_ZERO(fd);
for (i = 0; i < slistmax; i++) {
if (!(slist[i].flags & (SOCK_UNUSED | SOCK_VIRTUAL))) {
if ((slist[i].sock == STDOUT) && !backgrd)
fdtmp = STDIN;
else
fdtmp = slist[i].sock;
/*
* Looks like that having more than a call, in the same
* program, to the FD_SET macro, triggers a bug in gcc.
* SIGBUS crashing binaries used to be produced on a number
* (prolly all?) of 64 bits architectures.
* Make your best to avoid to make it happen again.
*
* ITE
*/
if (slist[i].flags & SOCK_TCL) {
if (!(slist[i].handler.tclsock.mask & tclmask))
continue;
} else if (tclonly)
continue;
foundsocks = 1;
FD_SET(fdtmp, fd);
}
}
return foundsocks;
}
/* A safer version of write() that deals with partial writes. */
void safe_write(int fd, const void *buf, size_t count)
{
const char *bytes = buf;
ssize_t ret;
static int inhere = 0;
do {
if ((ret = write(fd, bytes, count)) == -1 && errno != EINTR) {
if (!inhere) {
inhere = 1;
putlog(LOG_MISC, "*", "Unexpected write() failure on attempt to write %zd bytes to fd %d: %s.", count, fd, strerror(errno));
inhere = 0;
}
break;
}
} while ((bytes += ret, count -= ret));
}
/* Attempts to read from all sockets in slist (upper array boundary slistmax-1)
* fills s with up to 511 bytes if available, and returns the array index
* Also calls all handler procs for Tcl sockets
* sockread() can be called by Tcl threads
*
* on EOF: returns -1, with socket in len
* on socket error: returns -2
* if nothing is ready: returns -3
* tcl sockets busy: returns -5
*/
int sockread(char *s, int *len, sock_list *slist, int slistmax, int tclonly)
{
struct timeval t;
fd_set fdr, fdw, fde;
int fds, i, x, have_r, have_w, have_e;
int grab = 511, tclsock = -1, events = 0;
struct threaddata *td = threaddata();
fds = getdtablesize();
#ifdef FD_SETSIZE
if (fds > FD_SETSIZE)
fds = FD_SETSIZE; /* Fixes YET ANOTHER freebsd bug!!! */
#endif
have_r = preparefdset(&fdr, slist, slistmax, tclonly, TCL_READABLE);
have_w = preparefdset(&fdw, slist, slistmax, 1, TCL_WRITABLE);
have_e = preparefdset(&fde, slist, slistmax, 1, TCL_EXCEPTION);
/* select() may modify the timeval argument - copy it */
t.tv_sec = td->blocktime.tv_sec;
t.tv_usec = td->blocktime.tv_usec;
x = select((SELECT_TYPE_ARG1) fds,
SELECT_TYPE_ARG234 (have_r ? &fdr : NULL),
SELECT_TYPE_ARG234 (have_w ? &fdw : NULL),
SELECT_TYPE_ARG234 (have_e ? &fde : NULL),
SELECT_TYPE_ARG5 &t);
if (x == -1)
return -2; /* socket error */
for (i = 0; i < slistmax; i++) {
if (!tclonly && ((!(slist[i].flags & (SOCK_UNUSED | SOCK_TCL))) &&
((FD_ISSET(slist[i].sock, &fdr)) ||
#ifdef TLS
(slist[i].ssl && (SSL_pending(slist[i].ssl) ||
!SSL_is_init_finished(slist[i].ssl))) ||
#endif
((slist[i].sock == STDOUT) && (!backgrd) &&
(FD_ISSET(STDIN, &fdr)))))) {
if (slist[i].flags & (SOCK_LISTEN | SOCK_CONNECT)) {
/* Listening socket -- don't read, just return activity */
/* Same for connection attempt */
/* (for strong connections, require a read to succeed first) */
if (slist[i].flags & SOCK_PROXYWAIT) /* drummer */
/* Hang around to get the return code from proxy */
grab = 10;
#ifdef TLS
else if (!(slist[i].flags & SOCK_STRONGCONN) &&
(!(slist[i].ssl) || SSL_is_init_finished(slist[i].ssl))) {
#else
else if (!(slist[i].flags & SOCK_STRONGCONN)) {
#endif
debug1("net: connect! sock %d", slist[i].sock);
s[0] = 0;
*len = 0;
return i;
}
} else if (slist[i].flags & SOCK_PASS) {
s[0] = 0;
*len = 0;
return i;
}
errno = 0;
if ((slist[i].sock == STDOUT) && !backgrd)
x = read(STDIN, s, grab);
else
#ifdef TLS
{
if (slist[i].ssl) {
x = SSL_read(slist[i].ssl, s, grab);
if (x < 0) {
int err = SSL_get_error(slist[i].ssl, x);
if (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE)
errno = EAGAIN;
else
debug1("sockread(): SSL error = %s",
ERR_error_string(ERR_get_error(), 0));
x = -1;
}
} else
x = read(slist[i].sock, s, grab);
}
#else
x = read(slist[i].sock, s, grab);
#endif
if (x <= 0) { /* eof */
if (errno != EAGAIN) { /* EAGAIN happens when the operation would
* block on a non-blocking socket, if the
* socket is going to die, it will die later,
* otherwise it will connect. */
*len = slist[i].sock;
slist[i].flags &= ~SOCK_CONNECT;
debug1("net: eof!(read) socket %d", slist[i].sock);
return -1;
} else {
debug3("sockread EAGAIN: %d %d (%s)", slist[i].sock, errno,
strerror(errno));
continue; /* EAGAIN */
}
}
s[x] = 0;
*len = x;
if (slist[i].flags & SOCK_PROXYWAIT) {
debug2("net: socket: %d proxy errno: %d", slist[i].sock, s[1]);
slist[i].flags &= ~(SOCK_CONNECT | SOCK_PROXYWAIT);
switch (s[1]) {
case 90: /* Success */
s[0] = 0;
*len = 0;
return i;
case 91: /* Failed */
errno = ECONNREFUSED;
break;
case 92: /* No identd */
case 93: /* Identd said wrong username */
/* A better error message would be "socks misconfigured"
* or "identd not working" but this is simplest.
*/
errno = ENETUNREACH;
break;
}
*len = slist[i].sock;
return -1;
}
return i;
} else if (tclsock == -1 && (slist[i].flags & SOCK_TCL)) {
events = FD_ISSET(slist[i].sock, &fdr) ? TCL_READABLE : 0;
events |= FD_ISSET(slist[i].sock, &fdw) ? TCL_WRITABLE : 0;
events |= FD_ISSET(slist[i].sock, &fde) ? TCL_EXCEPTION : 0;
events &= slist[i].handler.tclsock.mask;
if (events)
tclsock = i;
}
}
if (!tclonly) {
s[0] = 0;
*len = 0;
}
if (tclsock != -1) {
(*slist[tclsock].handler.tclsock.proc)(slist[tclsock].handler.tclsock.cd,
events);
return -5;
}
return -3;
}
/* sockgets: buffer and read from sockets
*
* Attempts to read from all registered sockets for up to one second. if
* after one second, no complete data has been received from any of the
* sockets, 's' will be empty, 'len' will be 0, and sockgets will return -3.
* if there is returnable data received from a socket, the data will be
* in 's' (null-terminated if non-binary), the length will be returned
* in len, and the socket number will be returned.
* normal sockets have their input buffered, and each call to sockgets
* will return one line terminated with a '\n'. binary sockets are not
* buffered and return whatever coems in as soon as it arrives.
* listening sockets will return an empty string when a connection comes in.
* connecting sockets will return an empty string on a successful connect,
* or EOF on a failed connect.
* if an EOF is detected from any of the sockets, that socket number will be
* put in len, and -1 will be returned.
* the maximum length of the string returned is 512 (including null)
*
* Returns -4 if we handled something that shouldn't be handled by the
* dcc functions. Simply ignore it.
* Returns -5 if tcl sockets are busy but not eggdrop sockets.
*/
int sockgets(char *s, int *len)
{
char xx[514], *p, *px;
int ret, i, data = 0;
for (i = 0; i < threaddata()->MAXSOCKS; i++) {
/* Check for stored-up data waiting to be processed */
if (!(socklist[i].flags & (SOCK_UNUSED | SOCK_TCL | SOCK_BUFFER)) &&