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#include <sys/types.h>
#include <sys/param.h>
#include <netdb.h>
#include "sig.h"
#include "exit.h"
#include "sgetopt.h"
#include "uint16.h"
#include "fmt.h"
#include "scan.h"
#include "str.h"
#include "ip4.h"
#include "uint16.h"
#include "socket.h"
#include "fd.h"
#include "stralloc.h"
#include "buffer.h"
#include "error.h"
#include "strerr.h"
#include "pathexec.h"
#include "timeoutconn.h"
#include "remoteinfo.h"
#include "dns.h"
#define FATAL "tcpclient: fatal: "
#define CONNECT "tcpclient: unable to connect to "
void nomem(void)
{
strerr_die2x(111,FATAL,"out of memory");
}
void usage(void)
{
strerr_die1x(100,"tcpclient: usage: tcpclient \
[ -hHrRdDqQv ] \
[ -i localip ] \
[ -p localport ] \
[ -T timeoutconn ] \
[ -l localname ] \
[ -t timeoutinfo ] \
host port program");
}
int verbosity = 1;
int flagdelay = 1;
int flagremoteinfo = 1;
int flagremotehost = 1;
unsigned long itimeout = 26;
unsigned long ctimeout[2] = { 2, 58 };
char iplocal[4] = { 0,0,0,0 };
uint16 portlocal = 0;
char *forcelocal = 0;
char ipremote[4];
uint16 portremote;
char *hostname;
static stralloc addresses;
static stralloc moreaddresses;
static stralloc tmp;
static stralloc fqdn;
char strnum[FMT_ULONG];
char ipstr[IP4_FMT];
char seed[128];
main(int argc,char **argv)
{
unsigned long u;
int opt;
char *x;
int j;
int s;
int cloop;
dns_random_init(seed);
close(6);
close(7);
sig_ignore(sig_pipe);
while ((opt = getopt(argc,argv,"dDvqQhHrRi:p:t:T:l:")) != opteof)
switch(opt) {
case 'd': flagdelay = 1; break;
case 'D': flagdelay = 0; break;
case 'v': verbosity = 2; break;
case 'q': verbosity = 0; break;
case 'Q': verbosity = 1; break;
case 'l': forcelocal = optarg; break;
case 'H': flagremotehost = 0; break;
case 'h': flagremotehost = 1; break;
case 'R': flagremoteinfo = 0; break;
case 'r': flagremoteinfo = 1; break;
case 't': scan_ulong(optarg,&itimeout); break;
case 'T': j = scan_ulong(optarg,&ctimeout[0]);
if (optarg[j] == '+') ++j;
scan_ulong(optarg + j,&ctimeout[1]);
break;
case 'i': if (!ip4_scan(optarg,iplocal)) usage(); break;
case 'p': scan_ulong(optarg,&u); portlocal = u; break;
default: usage();
}
argv += optind;
if (!verbosity)
buffer_2->fd = -1;
hostname = *argv;
if (!hostname) usage();
if (str_equal(hostname,"")) hostname = "127.0.0.1";
if (str_equal(hostname,"0")) hostname = "127.0.0.1";
x = *++argv;
if (!x) usage();
if (!x[scan_ulong(x,&u)])
portremote = u;
else {
struct servent *se;
se = getservbyname(x,"tcp");
if (!se)
strerr_die3x(111,FATAL,"unable to figure out port number for ",x);
portremote = ntohs(se->s_port);
/* i continue to be amazed at the stupidity of the s_port interface */
}
if (!*++argv) usage();
if (!stralloc_copys(&tmp,hostname)) nomem();
if (dns_ip4_qualify(&addresses,&fqdn,&tmp) == -1)
strerr_die4sys(111,FATAL,"temporarily unable to figure out IP address for ",hostname,": ");
if (addresses.len < 4)
strerr_die3x(111,FATAL,"no IP address for ",hostname);
if (addresses.len == 4) {
ctimeout[0] += ctimeout[1];
ctimeout[1] = 0;
}
for (cloop = 0;cloop < 2;++cloop) {
if (!stralloc_copys(&moreaddresses,"")) nomem();
for (j = 0;j + 4 <= addresses.len;j += 4) {
s = socket_tcp();
if (s == -1)
strerr_die2sys(111,FATAL,"unable to create socket: ");
if (socket_bind4(s,iplocal,portlocal) == -1)
strerr_die2sys(111,FATAL,"unable to bind socket: ");
if (timeoutconn(s,addresses.s + j,portremote,ctimeout[cloop]) == 0)
goto CONNECTED;
close(s);
if (!cloop && ctimeout[1] && (errno == error_timeout)) {
if (!stralloc_catb(&moreaddresses,addresses.s + j,4)) nomem();
}
else {
strnum[fmt_ulong(strnum,portremote)] = 0;
ipstr[ip4_fmt(ipstr,addresses.s + j)] = 0;
strerr_warn5(CONNECT,ipstr," port ",strnum,": ",&strerr_sys);
}
}
if (!stralloc_copy(&addresses,&moreaddresses)) nomem();
}
_exit(111);
CONNECTED:
if (!flagdelay)
socket_tcpnodelay(s); /* if it fails, bummer */
if (!pathexec_env("PROTO","TCP")) nomem();
if (socket_local4(s,iplocal,&portlocal) == -1)
strerr_die2sys(111,FATAL,"unable to get local address: ");
strnum[fmt_ulong(strnum,portlocal)] = 0;
if (!pathexec_env("TCPLOCALPORT",strnum)) nomem();
ipstr[ip4_fmt(ipstr,iplocal)] = 0;
if (!pathexec_env("TCPLOCALIP",ipstr)) nomem();
x = forcelocal;
if (!x)
if (dns_name4(&tmp,iplocal) == 0) {
if (!stralloc_0(&tmp)) nomem();
x = tmp.s;
}
if (!pathexec_env("TCPLOCALHOST",x)) nomem();
if (socket_remote4(s,ipremote,&portremote) == -1)
strerr_die2sys(111,FATAL,"unable to get remote address: ");
strnum[fmt_ulong(strnum,portremote)] = 0;
if (!pathexec_env("TCPREMOTEPORT",strnum)) nomem();
ipstr[ip4_fmt(ipstr,ipremote)] = 0;
if (!pathexec_env("TCPREMOTEIP",ipstr)) nomem();
if (verbosity >= 2)
strerr_warn4("tcpclient: connected to ",ipstr," port ",strnum,0);
x = 0;
if (flagremotehost)
if (dns_name4(&tmp,ipremote) == 0) {
if (!stralloc_0(&tmp)) nomem();
x = tmp.s;
}
if (!pathexec_env("TCPREMOTEHOST",x)) nomem();
x = 0;
if (flagremoteinfo)
if (remoteinfo(&tmp,ipremote,portremote,iplocal,portlocal,itimeout) == 0) {
if (!stralloc_0(&tmp)) nomem();
x = tmp.s;
}
if (!pathexec_env("TCPREMOTEINFO",x)) nomem();
if (fd_move(6,s) == -1)
strerr_die2sys(111,FATAL,"unable to set up descriptor 6: ");
if (fd_copy(7,6) == -1)
strerr_die2sys(111,FATAL,"unable to set up descriptor 7: ");
sig_uncatch(sig_pipe);
pathexec(argv);
strerr_die4sys(111,FATAL,"unable to run ",*argv,": ");
}
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