lighttpd 1.4.x https://www.lighttpd.net/
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#include "first.h"
#include "base.h"
#include "plugin.h"
#include "log.h"
#include "stat_cache.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
typedef struct {
/* unparsed pieces */
buffer *path_pieces_raw;
/* pieces for path creation */
size_t len;
buffer **path_pieces;
} plugin_config;
typedef struct {
PLUGIN_DATA;
buffer *tmp_buf;
plugin_config **config_storage;
plugin_config conf;
} plugin_data;
INIT_FUNC(mod_evhost_init) {
plugin_data *p;
p = calloc(1, sizeof(*p));
p->tmp_buf = buffer_init();
return p;
}
FREE_FUNC(mod_evhost_free) {
plugin_data *p = p_d;
UNUSED(srv);
if (!p) return HANDLER_GO_ON;
if (p->config_storage) {
size_t i;
for (i = 0; i < srv->config_context->used; i++) {
plugin_config *s = p->config_storage[i];
if (NULL == s) continue;
if(s->path_pieces) {
size_t j;
for (j = 0; j < s->len; j++) {
buffer_free(s->path_pieces[j]);
}
free(s->path_pieces);
}
buffer_free(s->path_pieces_raw);
free(s);
}
free(p->config_storage);
}
buffer_free(p->tmp_buf);
free(p);
return HANDLER_GO_ON;
}
static int mod_evhost_parse_pattern(plugin_config *s) {
char *ptr = s->path_pieces_raw->ptr,*pos;
s->path_pieces = NULL;
for(pos=ptr;*ptr;ptr++) {
if(*ptr == '%') {
size_t len;
s->path_pieces = realloc(s->path_pieces,(s->len+2) * sizeof(*s->path_pieces));
s->path_pieces[s->len] = buffer_init();
s->path_pieces[s->len+1] = buffer_init();
/* "%%" "%_" "%x" "%{x.y}" where x and y are *single digit* 0 - 9 */
if (ptr[1] == '%' || ptr[1] == '_' || light_isdigit(ptr[1])) {
len = 2;
} else if (ptr[1] == '{') {
if (!light_isdigit(ptr[2])) return -1;
if (ptr[3] == '.') {
if (!light_isdigit(ptr[4])) return -1;
if (ptr[5] != '}') return -1;
len = 6;
} else if (ptr[3] == '}') {
len = 4;
} else {
return -1;
}
} else {
return -1;
}
buffer_copy_string_len(s->path_pieces[s->len],pos,ptr-pos);
pos = ptr + len;
buffer_copy_string_len(s->path_pieces[s->len+1],ptr,len);
ptr += len - 1; /*(ptr++ in for() loop)*/
s->len += 2;
}
}
if(*pos != '\0') {
s->path_pieces = realloc(s->path_pieces,(s->len+1) * sizeof(*s->path_pieces));
s->path_pieces[s->len] = buffer_init();
buffer_copy_string_len(s->path_pieces[s->len],pos,ptr-pos);
s->len += 1;
}
return 0;
}
SETDEFAULTS_FUNC(mod_evhost_set_defaults) {
plugin_data *p = p_d;
size_t i;
/**
*
* #
* # define a pattern for the host url finding
* # %% => % sign
* # %0 => domain name + tld
* # %1 => tld
* # %2 => domain name without tld
* # %3 => subdomain 1 name
* # %4 => subdomain 2 name
* # %_ => fqdn (without port info)
* #
* evhost.path-pattern = "/home/ckruse/dev/www/%3/htdocs/"
*
*/
config_values_t cv[] = {
{ "evhost.path-pattern", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },
{ NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
};
if (!p) return HANDLER_ERROR;
p->config_storage = calloc(srv->config_context->used, sizeof(plugin_config *));
for (i = 0; i < srv->config_context->used; i++) {
data_config const* config = (data_config const*)srv->config_context->data[i];
plugin_config *s;
s = calloc(1, sizeof(plugin_config));
s->path_pieces_raw = buffer_init();
s->path_pieces = NULL;
s->len = 0;
cv[0].destination = s->path_pieces_raw;
p->config_storage[i] = s;
if (0 != config_insert_values_global(srv, config->value, cv, i == 0 ? T_CONFIG_SCOPE_SERVER : T_CONFIG_SCOPE_CONNECTION)) {
return HANDLER_ERROR;
}
if (!buffer_string_is_empty(s->path_pieces_raw)) {
if (0 != mod_evhost_parse_pattern(s)) {
log_error_write(srv, __FILE__, __LINE__, "sb", "invalid evhost.path-pattern:", s->path_pieces_raw);
return HANDLER_ERROR;
}
}
}
return HANDLER_GO_ON;
}
/**
* assign the different parts of the domain to array-indezes (sub2.sub1.domain.tld)
* - %0 - domain.tld
* - %1 - tld
* - %2 - domain
* - %3 - sub1
* - ...
*/
static void mod_evhost_parse_host(buffer *key, array *host, buffer *authority) {
char *ptr = authority->ptr + buffer_string_length(authority);
char *colon = ptr; /* needed to filter out the colon (if exists) */
int first = 1;
int i;
/*if (ptr == authority->ptr) return;*//*(no authority checked earlier)*/
if (*authority->ptr == '[') { /* authority is IPv6 literal address */
colon = ptr;
if (ptr[-1] != ']') {
do { --ptr; } while (ptr > authority->ptr && ptr[-1] != ']');
if (*ptr != ':') return; /*(should not happen for valid authority)*/
colon = ptr;
}
ptr = authority->ptr;
array_insert_key_value(host,CONST_STR_LEN("%0"),ptr,colon-ptr);
return;
}
/* first, find the domain + tld */
for(; ptr > authority->ptr; --ptr) {
if(*ptr == '.') {
if(first) first = 0;
else break;
} else if(*ptr == ':') {
colon = ptr;
first = 1;
}
}
/* if we stopped at a dot, skip the dot */
if (*ptr == '.') ptr++;
array_insert_key_value(host, CONST_STR_LEN("%0"), ptr, colon-ptr);
/* if the : is not the start of the authority, go on parsing the hostname */
if (colon != authority->ptr) {
for(ptr = colon - 1, i = 1; ptr > authority->ptr; --ptr) {
if(*ptr == '.') {
if (ptr != colon - 1) {
/* is something between the dots */
buffer_copy_string_len(key, CONST_STR_LEN("%"));
buffer_append_int(key, i++);
array_insert_key_value(host, CONST_BUF_LEN(key), ptr+1, colon-ptr-1);
}
colon = ptr;
}
}
/* if the . is not the first charactor of the hostname */
if (colon != ptr) {
buffer_copy_string_len(key, CONST_STR_LEN("%"));
buffer_append_int(key, i /* ++ */);
array_insert_key_value(host, CONST_BUF_LEN(key), ptr, colon-ptr);
}
}
}
#define PATCH(x) \
p->conf.x = s->x;
static int mod_evhost_patch_connection(server *srv, connection *con, plugin_data *p) {
size_t i, j;
plugin_config *s = p->config_storage[0];
PATCH(path_pieces);
PATCH(len);
/* skip the first, the global context */
for (i = 1; i < srv->config_context->used; i++) {
data_config *dc = (data_config *)srv->config_context->data[i];
s = p->config_storage[i];
/* condition didn't match */
if (!config_check_cond(srv, con, dc)) continue;
/* merge config */
for (j = 0; j < dc->value->used; j++) {
data_unset *du = dc->value->data[j];
if (buffer_is_equal_string(du->key, CONST_STR_LEN("evhost.path-pattern"))) {
PATCH(path_pieces);
PATCH(len);
}
}
}
return 0;
}
#undef PATCH
static void mod_evhost_build_doc_root_path(buffer *b, array *parsed_host, buffer *authority, buffer **path_pieces, const size_t npieces) {
array_reset_data_strings(parsed_host);
mod_evhost_parse_host(b, parsed_host, authority);
buffer_clear(b);
for (size_t i = 0; i < npieces; ++i) {
const char *ptr = path_pieces[i]->ptr;
if (*ptr == '%') {
data_string *ds;
if (*(ptr+1) == '%') {
/* %% */
buffer_append_string_len(b, CONST_STR_LEN("%"));
} else if (*(ptr+1) == '_' ) {
/* %_ == full hostname */
char *colon = strchr(authority->ptr, ':');
if(colon == NULL) {
buffer_append_string_buffer(b, authority); /* adds fqdn */
} else {
/* strip the port out of the authority-part of the URI scheme */
buffer_append_string_len(b, authority->ptr, colon - authority->ptr); /* adds fqdn */
}
} else if (ptr[1] == '{' ) {
char s[3] = "% ";
s[1] = ptr[2]; /*(assumes single digit before '.', and, optionally, '.' and single digit after '.')*/
if (NULL != (ds = (data_string *)array_get_element_klen(parsed_host, s, 2))) {
if (ptr[3] != '.' || ptr[4] == '0') {
buffer_append_string_buffer(b, ds->value);
} else {
if ((size_t)(ptr[4]-'0') <= buffer_string_length(ds->value)) {
buffer_append_string_len(b, ds->value->ptr+(ptr[4]-'0')-1, 1);
}
}
} else {
/* unhandled %-sequence */
}
} else if (NULL != (ds = (data_string *)array_get_element_klen(parsed_host, CONST_BUF_LEN(path_pieces[i])))) {
buffer_append_string_buffer(b, ds->value);
} else {
/* unhandled %-sequence */
}
} else {
buffer_append_string_buffer(b, path_pieces[i]);
}
}
buffer_append_slash(b);
}
static handler_t mod_evhost_uri_handler(server *srv, connection *con, void *p_d) {
plugin_data *p = p_d;
stat_cache_entry *sce = NULL;
/* not authority set */
if (buffer_string_is_empty(con->uri.authority)) return HANDLER_GO_ON;
mod_evhost_patch_connection(srv, con, p);
/* missing even default(global) conf */
if (0 == p->conf.len) {
return HANDLER_GO_ON;
}
mod_evhost_build_doc_root_path(p->tmp_buf, srv->split_vals, con->uri.authority, p->conf.path_pieces, p->conf.len);
if (HANDLER_ERROR == stat_cache_get_entry(srv, con, p->tmp_buf, &sce)) {
log_error_write(srv, __FILE__, __LINE__, "sb", strerror(errno), p->tmp_buf);
} else if(!S_ISDIR(sce->st.st_mode)) {
log_error_write(srv, __FILE__, __LINE__, "sb", "not a directory:", p->tmp_buf);
} else {
buffer_copy_buffer(con->physical.doc_root, p->tmp_buf);
}
return HANDLER_GO_ON;
}
int mod_evhost_plugin_init(plugin *p);
int mod_evhost_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = buffer_init_string("evhost");
p->init = mod_evhost_init;
p->set_defaults = mod_evhost_set_defaults;
p->handle_docroot = mod_evhost_uri_handler;
p->cleanup = mod_evhost_free;
p->data = NULL;
return 0;
}
/* eof */