From: short <>
Date: Mon, 9 Jul 2001 22:48:40 +0000 (+0000)
Subject: "identd" client, by Tomas Bures <ghort@atrey.karlin.mff.cuni.cz>
X-Git-Tag: rh71~83
X-Git-Url: https://git.jankratochvil.net/?p=nethome.git;a=commitdiff_plain;h=1390b87ff8b7df739397fd8a5792067a3cff2a58

"identd" client, by Tomas Bures <ghort@atrey.karlin.mff.cuni.cz>
---

diff --git a/src/ghortident.c b/src/ghortident.c
new file mode 100644
index 0000000..d25ff0c
--- /dev/null
+++ b/src/ghortident.c
@@ -0,0 +1,172 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <netinet/in.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#define DBG 0
+
+int parseparams(int argc, char *argv[], ulong *adres, uint *rport, uint *lport, uint *service)
+{
+	char *s;
+	uint c, d;
+	
+	if (argc<1) return 255;
+	
+	*lport=80;
+	*service=113;
+	
+	switch (argc)
+	{
+		case 2:
+			fprintf(stderr,"Error: missing remote port!\n");
+		case 1:
+			fprintf(stderr,"Usage: ident <xxx.xxx.xxx.xxx> <remote port> [local port] [ident port]\n");
+			return 1;
+		default:
+		case 5:
+			c=0;
+			s=argv[4];
+			while (*s)
+			{
+				if (c<65536 && *s>='0' && *s<='9') c=c*10+*s-'0';
+				else
+				{
+					fprintf(stderr,"Error: wrong ident port!\n");
+					return 5;
+				}
+				s++;
+			}
+			*service=c;
+		case 4:
+			c=0;
+			s=argv[3];
+			while (*s)
+			{
+				if (c<65536 && *s>='0' && *s<='9') c=c*10+*s-'0';
+				else
+				{
+					fprintf(stderr,"Error: wrong local port!\n");
+					return 4;
+				}
+				s++;
+			}
+			*lport=c;
+		case 3:
+			*adres=0;
+			c=d=0;
+			s=argv[1];
+			while (*s)
+			{	
+				if (*s>='0' && *s<='9') 
+				{
+					c=c*10+*s-'0';
+					if (c>255)
+					{
+						fprintf(stderr,"Error: wrong address!\n");
+						return 2;
+					}
+				}
+				else
+					if (*s=='.')
+					{
+						*adres=*adres*256+c;
+						c=0;
+						if (d++>=3)
+						{
+							fprintf(stderr,"Error: wrong address!\n");
+							return 2;
+						}
+					}
+					else 
+					{
+						fprintf(stderr,"Error: wrong address!\n"); 
+						return 2;
+					}
+				s++;
+			}
+			*adres=*adres*256+c;
+			
+			c=0;
+			s=argv[2];
+			while (*s)
+			{
+				if (c<65536 && *s>='0' && *s<='9') c=c*10+*s-'0';
+				else
+				{
+					fprintf(stderr,"Error: wrong remote port!\n");
+					return 3;
+				}
+				s++;
+			}
+			*rport=c;
+	}
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	int sock;
+	struct sockaddr_in addr;
+	char buf[256];
+	int count;
+	ulong adres;
+	uint rport, lport, service;
+	int err;
+	static const int val_one=1;
+
+	if (parseparams(argc,argv,&adres,&rport,&lport,&service)) return 3;
+
+	if (DBG) fprintf(stderr,"addr: %lX  rport: %u  lport: %u  service: %i\n",adres,rport,lport,service);
+
+	addr.sin_family=AF_INET;
+	addr.sin_addr.s_addr=htonl(adres);
+	addr.sin_port=htons(service);
+
+	sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
+	setsockopt(sock,SOL_SOCKET,SO_KEEPALIVE,&val_one,sizeof(val_one));
+
+	if (DBG) 
+	{
+		err=errno;
+		fprintf(stderr,"socket: %i, errno: %i\n",sock,err);
+	}
+	if (sock==-1) 
+	{
+		fprintf(stderr,"Error: cannot create socket!\n");
+		return 4;
+	}
+
+	count=connect(sock,(struct sockaddr*)&addr,sizeof(addr));
+	if (DBG)
+	{
+		err=errno;
+		fprintf(stderr,"connect: %i, errno: %i\n",count,err);	
+	}
+
+	if (count)
+	{
+		fprintf(stderr,"Error: connection failed!\n");
+		return 5;
+	}
+
+	count=snprintf(buf,sizeof(buf),"%d , %d\n",rport,lport);
+	if (count==-1) return 1;
+	if (write(sock,buf,count)!=count) return 2;
+	
+	for (;;)
+	{
+		count=read(sock,buf,sizeof(buf)-1);
+		if (count<=0) break;
+		buf[count]=0;
+		printf("%s",buf);
+		fflush(stdout);
+	}
+
+	if (DBG) fprintf(stderr,"count = %d , errno = %d\n",count,errno);
+	close(sock);
+	return 0;
+}
+