gemini server written in C used with inetd
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#include <err.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <syslog.h>
#include <unistd.h>
#include "utils.h"
#if defined(__OpenBSD__) || defined(__FreeBSD__) || defined( _NetBSD__) || defined(__DragonFly__)
#include <string.h>
#else
#include <bsd/string.h>
#endif
/* e*foo() functions are the equivalent of foo() but handle errors.
* In case an error happens:
* The error is printed to stdout
* return 1
*/
#ifdef __OpenBSD__
void
eunveil(const char *path, const char *permissions)
{
if (unveil(path, permissions) == -1) {
syslog(LOG_DAEMON, "unveil on %s failed", path);
err(1, "unveil on %s failed", path);
}
}
void
epledge(const char *promises, const char *execpromises)
{
if (pledge(promises, execpromises) == -1) {
syslog(LOG_DAEMON, "pledge failed for: %s", promises);
err(1, "pledge failed for: %s", promises);
}
}
#endif
size_t
estrlcpy(char *dst, const char *src, size_t dstsize)
{
size_t n = 0;
n = strlcpy(dst, src, dstsize);
if (n >= dstsize) {
err(1, "strlcpy failed for %s = %s", dst, src);
}
return n;
}
size_t
estrlcat(char *dst, const char *src, size_t dstsize)
{
size_t size;
if ((size = strlcat(dst, src, dstsize)) >= dstsize)
err(1, "strlcat on %s + %s", dst, src);
return size;
}
int
esetenv(const char *name, const char *value, int overwrite)
{
int ret = 0;
ret = setenv(name, value, overwrite);
if (ret != 0) {
err(1, "setenv %s:%s", name, value);
}
return ret;
}
/* send error in syslog, to stdout and die */
void
errlog(const char *format, ...)
{
char e[1024] = {'\0'};
va_list ap;
fflush(stdout); /* make sure older messages are printed */
va_start(ap, format);
vsnprintf(e, sizeof(e), format, ap);
va_end(ap);
syslog(LOG_DAEMON, "%s", e);
err(1, "%s", e);
}