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[core] add option to read config file from stdin

add option to read config file from stdin using: -f -
(with "-" indicating to read config file from stdin)

This was already been possible using temporary files, unlinked and
passed to lighttpd as -f /proc/self/fd/XX (with XX as fd number)
on systems (or containers) in which /proc/self/fd/ is available

Note: using -f - is incompatible with one-shot mode (-1)
since one-shot mode expects stdin to be connected to the client
master
Glenn Strauss 7 months ago
parent
commit
2663bda37c
  1. 38
      src/configfile.c

38
src/configfile.c

@ -2,6 +2,7 @@
#include "base.h"
#include "burl.h"
#include "chunk.h"
#include "fdevent.h"
#include "http_etag.h"
#include "keyvalue.h"
@ -1995,6 +1996,39 @@ static int config_parse(server *srv, config_t *context, const char *source, cons
return ret == -1 ? -1 : 0;
}
__attribute_cold__
static int config_parse_stdin(server *srv, config_t *context) {
buffer * const b = chunk_buffer_acquire();
size_t dlen;
ssize_t n = -1;
do {
if (n > 0)
buffer_commit(b, n);
size_t avail = buffer_string_space(b);
dlen = buffer_string_length(b);
if (__builtin_expect( (avail < 1024), 0)) {
/*(arbitrary limit: 32 MB file; expect < 1 MB)*/
if (dlen >= 32*1024*1024) {
log_error(srv->errh, __FILE__, __LINE__,
"config read from stdin is way too large");
break;
}
avail = chunk_buffer_prepare_append(b, b->size+avail);
}
n = read(STDIN_FILENO, b->ptr+dlen, avail);
} while (n > 0 || (n == -1 && errno == EINTR));
int rc = -1;
if (0 == n)
rc = dlen ? config_parse(srv, context, "-", b->ptr, dlen) : 0;
else
log_perror(srv->errh, __FILE__, __LINE__, "config read from stdin");
if (dlen)
safe_memclear(b->ptr, dlen);
chunk_buffer_release(b);
return rc;
}
static int config_parse_file_stream(server *srv, config_t *context, const char *fn) {
off_t dlen = 32*1024*1024;/*(arbitrary limit: 32 MB file; expect < 1 MB)*/
char *data = fdevent_load_file(fn, &dlen, NULL, malloc, free);
@ -2204,7 +2238,9 @@ int config_read(server *srv, const char *fn) {
array_insert_unique(context.all_configs, (data_unset *)dc);
context.current = dc;
ret = config_parse_file_stream(srv, &context, fn);
ret = (0 != strcmp(fn, "-")) /*(incompatible with one-shot mode)*/
? config_parse_file_stream(srv, &context, fn)
: config_parse_stdin(srv, &context);
/* remains nothing if parser is ok */
force_assert(!(0 == ret && context.ok && 0 != context.configs_stack.used));

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