From 07f78f990a68eda368d3e195edf34d42a196583e Mon Sep 17 00:00:00 2001
From: epoch <epoch@hack.thebackupbox.net>
Date: Mon, 16 Nov 2020 00:53:44 +0000
Subject: added a shorten program that I use in except for making shortened
 links on epo.k.vu

---
 .gitignore |  1 +
 Makefile   |  8 +++++++-
 shorten.c  | 37 +++++++++++++++++++++++++++++++++++++
 3 files changed, 45 insertions(+), 1 deletion(-)
 create mode 100644 shorten.c

diff --git a/.gitignore b/.gitignore
index 6dc11bf..e76a1a0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ uriescape
 urimatch
 uriunescape
 urijoin
+shorten
diff --git a/Makefile b/Makefile
index 7809a59..3910625 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,10 @@ CFLAGS:=-std=c11 -pedantic -Wall
 PREFIX:=/usr/local
 CC:=gcc
 
-all: urimatch uricut urijoin uricmp uriunescape uriescape
+all: urimatch uricut urijoin uricmp uriunescape uriescape shorten
+
+shorten: LDFLAGS=-lcrypto
+shorten: shorten.c
 
 urimatch: urimatch.c uri.h
 
@@ -37,3 +40,6 @@ install: all
 	install -t $(PREFIX)/bin copy_start_nevermind.sh
 	install -t $(PREFIX)/bin choose
 	install -t $(PREFIX)/bin query_param
+	install -t $(PREFIX)/bin shorten
+	chgrp shorten $(PREFIX)/bin/shorten
+	chmod g+s $(PREFIX)/bin/shorten
diff --git a/shorten.c b/shorten.c
new file mode 100644
index 0000000..ac76d84
--- /dev/null
+++ b/shorten.c
@@ -0,0 +1,37 @@
+#define _POSIX_C_SOURCE 200908
+#include <stdio.h>
+#include <sys/stat.h>
+#include <openssl/md5.h>
+#include <string.h>
+//#include <sys/types.h>
+#include <sys/xattr.h>
+
+#define BYTES_IN_SHORT 2
+#define CACHE_DIR "/var/cache/shorten"
+
+int main(int argc,char *argv[]) {
+  int i;
+  if(argc < 2) return 1;
+  unsigned char *p=MD5((unsigned char *)argv[1],strlen(argv[1]),NULL);
+  char filepath[4096];//too long, oh well
+  char out[256];
+  char tmp[3];
+  strcpy(out,"");
+  for(i=0;i<BYTES_IN_SHORT;i++) {
+    snprintf(tmp,sizeof(tmp),"%02x",p[i]);
+    strcat(out,tmp);
+  }
+  printf("%s\n",out);
+  snprintf(filepath,sizeof(filepath)-1,"%s/%s",CACHE_DIR,out);
+  FILE *fp;
+  if((fp=fopen(filepath,"w")) == NULL) {
+    fprintf(stderr,"shorten: failed to write a file: %s\n",filepath);
+    return 1;
+  }
+  fprintf(fp,"%s\n",argv[1]);
+  //disabled for now because tmpfs can't do extended attributes
+  //fprintf(stderr,"fsetxattr return: %d\n",fsetxattr(fileno(fp),"user.mime-type","text/uri-list",strlen("text/uri-list"),0));
+  //perror("fsetxattr");
+  fchmod(fileno(fp),0664);
+  fclose(fp);
+}
-- 
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