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#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include "substdio.h"
#include "stralloc.h"
#include "str.h"
#include "byte.h"
#include "error.h"
#include "sig.h"
#include "subfd.h"
#include "fd.h"
#include "ip.h"
#include "ipalloc.h"
#include "case.h"
#include "sgetopt.h"
#include "exit.h"
#include "scan.h"
#include "fmt.h"
#include "env.h"
#include "dns.h"
#include "remoteinfo.h"
int verbosity = 1;
char temp[IPFMT + FMT_ULONG];
void out(s) char *s; { if (verbosity) substdio_puts(subfderr,s); }
void flush() { if (verbosity) substdio_flush(subfderr); }
void usage()
{ out("tcpclient: usage: \
tcpclient [ -qQvdDrRU ] [ -plocport ] [ -llocalname ] [ -ttimeoutinfo ] \
[ -Ttimeoutconn ] host port program\n"); flush(); _exit(100); }
void die(s) char *s;
{ out("tcpclient: fatal: "); out(s); out("\n"); flush(); _exit(111); }
void diep(s) char *s;
{ char *x = error_str(errno);
out("tcpclient: fatal: "); out(s); out(": ");
out(x); out("\n"); flush(); _exit(111); }
void nomem()
{ die("out of memory"); }
void warnconnect(ipr) struct ip_address *ipr;
{
char *x = error_str(errno);
temp[ip_fmt(temp,ipr)] = 0;
out("tcpclient: unable to connect to "); out(temp); out(": ");
out(x); out("\n"); flush(); }
void infoconnected(ipr) struct ip_address *ipr;
{ if (verbosity < 2) return;
temp[ip_fmt(temp,ipr)] = 0;
out("tcpclient: connected to "); out(temp); out("\n"); flush(); }
int flagdelay = 1;
int flagremoteinfo = 1;
int flagremotehost = 1;
char *forcelocal = 0;
unsigned long timeout = 26;
unsigned long timeout2 = 60;
stralloc tmp = {0};
ipalloc ia = {0};
struct sockaddr_in salocal;
struct ip_address iplocal;
unsigned long portlocal;
struct sockaddr_in saremote;
struct ip_address ipremote;
unsigned long portremote;
void main(argc,argv)
int argc;
char **argv;
{
int s;
int dummy;
int opt;
char *hostname;
char *portname;
struct servent *se;
int j;
portlocal = 0;
while ((opt = getopt(argc,argv,"dDvqQLhHrRp:Ut: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 'p': scan_ulong(optarg,&portlocal); break;
case 't': scan_ulong(optarg,&timeout); break;
case 'T': scan_ulong(optarg,&timeout2); break;
case 'U': usage();
default: _exit(100);
}
argc -= optind;
argv += optind;
hostname = *argv++;
if (!hostname) usage();
portname = *argv++;
if (!portname) usage();
if (!*argv) usage();
close(6);
close(7);
sig_pipeignore();
dns_init(1);
byte_zero(&salocal,sizeof(salocal));
salocal.sin_family = AF_INET;
salocal.sin_addr.s_addr = INADDR_ANY;
salocal.sin_port = htons((unsigned short) portlocal);
byte_zero(&saremote,sizeof(saremote));
saremote.sin_family = AF_INET;
if (!portname[scan_ulong(portname,&portremote)])
;
else {
se = getservbyname(portname,"tcp");
if (!se) die("unable to figure out port number");
portremote = ntohs(se->s_port);
/* i continue to be amazed at the stupidity of the s_port interface */
}
if (!str_diff(hostname,"0")) hostname = "0.0.0.0";
if (!hostname[ip_scan(hostname,&ipremote)]) {
s = socket(AF_INET,SOCK_STREAM,0);
if (s == -1) diep("unable to create socket");
if (bind(s,(struct sockaddr *) &salocal,sizeof(salocal)) == -1)
diep("unable to bind");
if (timeoutconn(s,&ipremote,portremote,(int) timeout2) == -1) {
warnconnect(&ipremote);
_exit(111);
}
}
else {
if (!stralloc_copys(&tmp,hostname)) nomem();
switch(dns_ip(&ia,&tmp)) {
case DNS_SOFT: die("temporarily unable to figure out host address");
case DNS_HARD: die("unable to figure out host address");
case DNS_MEM: nomem();
}
if (ia.len == 0) die("no IP addresses for that host");
for (j = 0;j < ia.len;++j) {
s = socket(AF_INET,SOCK_STREAM,0);
if (s == -1) diep("unable to create socket");
if (bind(s,(struct sockaddr *) &salocal,sizeof(salocal)) == -1)
diep("unable to bind");
byte_copy(&ipremote,4,&ia.ix[j].ip);
if (timeoutconn(s,&ipremote,portremote,(int) timeout2) == 0) break;
warnconnect(&ipremote);
close(s);
}
if (j == ia.len) _exit(111);
}
if (!flagdelay) {
int opt = 1;
setsockopt(s,IPPROTO_TCP,1,&opt,sizeof(opt)); /* 1 == TCP_NODELAY */
/* if it fails, bummer */
}
if (!env_init()) nomem();
if (!env_put("PROTO=TCP")) nomem();
if (!env_unset("TCPLOCALHOST")) nomem();
if (!env_unset("TCPREMOTEHOST")) nomem();
if (!env_unset("TCPREMOTEINFO")) nomem();
dummy = sizeof(salocal);
if (getsockname(s,(struct sockaddr *) &salocal,&dummy) == -1)
diep("unable to get local address");
portlocal = ntohs(salocal.sin_port);
byte_copy(&iplocal,4,&salocal.sin_addr);
temp[fmt_ulong(temp,portlocal)] = 0;
if (!env_put2("TCPLOCALPORT",temp)) nomem();
temp[ip_fmt(temp,&iplocal)] = 0;
if (!env_put2("TCPLOCALIP",temp)) nomem();
if (forcelocal) {
if (!env_put2("TCPLOCALHOST",forcelocal)) nomem();
}
else
switch(dns_ptr(&tmp,&iplocal)) {
case DNS_MEM: nomem();
case 0:
if (!stralloc_0(&tmp)) nomem();
case_lowers(tmp.s);
if (!env_put2("TCPLOCALHOST",tmp.s)) nomem();
}
dummy = sizeof(saremote);
if (getpeername(s,(struct sockaddr *) &saremote,&dummy) == -1)
diep("unable to get remote address");
portremote = ntohs(saremote.sin_port);
byte_copy(&ipremote,4,&saremote.sin_addr);
infoconnected(&ipremote);
temp[fmt_ulong(temp,portremote)] = 0;
if (!env_put2("TCPREMOTEPORT",temp)) nomem();
temp[ip_fmt(temp,&ipremote)] = 0;
if (!env_put2("TCPREMOTEIP",temp)) nomem();
if (flagremotehost)
switch(dns_ptr(&tmp,&ipremote)) {
case DNS_MEM: nomem();
case 0:
if (!stralloc_0(&tmp)) nomem();
case_lowers(tmp.s);
if (!env_put2("TCPREMOTEHOST",tmp.s)) nomem();
}
if (flagremoteinfo) {
char *rinfo;
rinfo = remoteinfo_get(&ipremote,portremote,&iplocal,portlocal,(int) timeout);
if (rinfo)
if (!env_put2("TCPREMOTEINFO",rinfo)) nomem();
}
if (fd_move(6,s) == -1) diep("unable to set up descriptor 6");
if (fd_copy(7,6) == -1) diep("unable to set up descriptor 7");
sig_pipedefault();
execvp(*argv,argv);
diep("unable to execute");
}
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