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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
static int check_fname(const char* fname)
{
while (*fname) {
if (strchr("/.", *(fname++))) {
return 0;
}
}
return 1;
}
static int dump_file(const char* fname)
{
int fd = open(fname, O_RDONLY);
if (fd == -1) {
fprintf(stderr, "Failed to open %s\n", fname);
return 1;
}
char buf[1024];
int buflen;
while ((buflen = read(fd, buf, sizeof(buf))) > 0) {
write(1, buf, buflen);
}
close(fd);
return 0;
}
int main(int argc, char** argv)
{
const char* file = getenv("KEYPER_FILE");
const char* disable_file_env = getenv("KEYPER_DISABLE_FILE");
char disable_file[4096];
if (!disable_file_env) {
const char* home = getenv("HOME");
if (!home) {
fprintf(stderr, "No $HOME environment variable\n");
return 2;
}
snprintf(disable_file, sizeof(disable_file) - 1, "%s/keyper-disable", home);
} else {
strncpy(disable_file, disable_file_env, sizeof(disable_file) - 1);
}
if (!file) {
fprintf(stderr, "No KEYPER_FILE value.\n");
return 1;
}
if (disable_file[0] != '/') {
fprintf(stderr, "$KEYPER_DISABLE_FILE must be an absolute path!\n");
return 1;
}
if (file[0] != '/') {
fprintf(stderr, "$KEYPER_FILE must be an absolute path!\n");
return 1;
}
struct stat statbuf;
if (!stat(disable_file, &statbuf)) {
fprintf(stderr, "Keyper disabled because %s exists.\n", disable_file);
return 127;
}
return dump_file(file);
}
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