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>
/**
*
* #
* # 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/"
*
*/
typedef struct {
/* pieces for path creation */
const buffer *path_pieces;
} plugin_config;
typedef struct {
PLUGIN_DATA;
plugin_config defaults;
plugin_config conf;
array split_vals;
} plugin_data;
INIT_FUNC(mod_evhost_init) {
return calloc(1, sizeof(plugin_data));
}
static void mod_evhost_free_path_pieces(const buffer *path_pieces) {
buffer *b;
*(const buffer **)&b = path_pieces;
for (; path_pieces->ptr; ++path_pieces) free(path_pieces->ptr);
free(b);
}
FREE_FUNC(mod_evhost_free) {
plugin_data * const p = p_d;
array_free_data(&p->split_vals);
if (NULL == p->cvlist) return;
/* (init i to 0 if global context; to 1 to skip empty global context) */
for (int i = !p->cvlist[0].v.u2[1], used = p->nconfig; i < used; ++i) {
config_plugin_value_t *cpv = p->cvlist + p->cvlist[i].v.u2[0];
for (; -1 != cpv->k_id; ++cpv) {
if (cpv->vtype != T_CONFIG_LOCAL || NULL == cpv->v.v) continue;
switch (cpv->k_id) {
case 0: /* evhost.path-pattern */
mod_evhost_free_path_pieces(cpv->v.v);
break;
default:
break;
}
}
}
}
__attribute_cold__
static buffer * mod_evhost_parse_pattern_err(buffer *bptr) {
for (; bptr->ptr; ++bptr) free(bptr->ptr);
return NULL;
}
static buffer * mod_evhost_parse_pattern(const char *ptr) {
uint32_t used = 0;
const uint32_t sz = 127;/* (sz+1 must match bptr[] num elts below) */
const char *pos;
buffer bptr[128]; /* (128 elements takes 2k on stack in 64-bit) */
memset(bptr, 0, sizeof(bptr));
for(pos=ptr;*ptr;ptr++) {
if(*ptr == '%') {
size_t len;
if (used >= sz-1) /* (should not happen) */
return mod_evhost_parse_pattern_err(bptr);
/* "%%" "%_" "%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 mod_evhost_parse_pattern_err(bptr);
if (ptr[3] == '.') {
if (!light_isdigit(ptr[4]))
return mod_evhost_parse_pattern_err(bptr);
if (ptr[5] != '}')
return mod_evhost_parse_pattern_err(bptr);
len = 6;
} else if (ptr[3] == '}') {
len = 4;
} else {
return mod_evhost_parse_pattern_err(bptr);
}
} else {
return mod_evhost_parse_pattern_err(bptr);
}
buffer_copy_string_len(bptr+used, pos, ptr-pos);
pos = ptr + len;
buffer_copy_string_len(bptr+used+1, ptr, len);
ptr += len - 1; /*(ptr++ in for() loop)*/
used += 2;
}
}
if(*pos != '\0') {
if (used >= sz) /* (should not happen) */
return mod_evhost_parse_pattern_err(bptr);
buffer_copy_string_len(bptr+used, pos, ptr-pos);
++used;
}
buffer * const path_pieces =
malloc(sizeof(bptr) + ((used+1) * sizeof(buffer)));
force_assert(path_pieces);
return memcpy(path_pieces, bptr, (used+1) * sizeof(buffer));
}
static void mod_evhost_merge_config_cpv(plugin_config * const pconf, const config_plugin_value_t * const cpv) {
switch (cpv->k_id) { /* index into static config_plugin_keys_t cpk[] */
case 0: /* evhost.path-pattern */
if (cpv->vtype == T_CONFIG_LOCAL)
pconf->path_pieces = cpv->v.v;
break;
default:/* should not happen */
return;
}
}
static void mod_evhost_merge_config(plugin_config * const pconf, const config_plugin_value_t *cpv) {
do {
mod_evhost_merge_config_cpv(pconf, cpv);
} while ((++cpv)->k_id != -1);
}
static void mod_evhost_patch_config(request_st * const r, plugin_data * const p) {
p->conf = p->defaults; /* copy small struct instead of memcpy() */
/*memcpy(&p->conf, &p->defaults, sizeof(plugin_config));*/
for (int i = 1, used = p->nconfig; i < used; ++i) {
if (config_check_cond(r, (uint32_t)p->cvlist[i].k_id))
mod_evhost_merge_config(&p->conf, p->cvlist + p->cvlist[i].v.u2[0]);
}
}
SETDEFAULTS_FUNC(mod_evhost_set_defaults) {
static const config_plugin_keys_t cpk[] = {
{ CONST_STR_LEN("evhost.path-pattern"),
T_CONFIG_STRING,
T_CONFIG_SCOPE_CONNECTION }
,{ NULL, 0,
T_CONFIG_UNSET,
T_CONFIG_SCOPE_UNSET }
};
plugin_data * const p = p_d;
if (!config_plugin_values_init(srv, p, cpk, "mod_evhost"))
return HANDLER_ERROR;
/* process and validate config directives
* (init i to 0 if global context; to 1 to skip empty global context) */
for (int i = !p->cvlist[0].v.u2[1]; i < p->nconfig; ++i) {
config_plugin_value_t *cpv = p->cvlist + p->cvlist[i].v.u2[0];
for (; -1 != cpv->k_id; ++cpv) {
switch (cpv->k_id) {
case 0: /* evhost.path-pattern */
if (!buffer_is_blank(cpv->v.b)) {
const char * const ptr = cpv->v.b->ptr;
cpv->v.v = mod_evhost_parse_pattern(ptr);
if (NULL == cpv->v.v) {
log_error(srv->errh, __FILE__, __LINE__,
"invalid evhost.path-pattern: %s", ptr);
return HANDLER_ERROR;
}
cpv->vtype = T_CONFIG_LOCAL;
}
break;
default:/* should not happen */
break;
}
}
}
/* initialize p->defaults from global config context */
if (p->nconfig > 0 && p->cvlist->v.u2[1]) {
const config_plugin_value_t *cpv = p->cvlist + p->cvlist->v.u2[0];
if (-1 != cpv->k_id)
mod_evhost_merge_config(&p->defaults, cpv);
}
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_clen(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_set_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_set_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_set_key_value(host, BUF_PTR_LEN(key), ptr+1, colon-ptr-1);
}
colon = ptr;
}
}
/* if the . is not the first character of the hostname */
if (colon != ptr) {
buffer_copy_string_len(key, CONST_STR_LEN("%"));
buffer_append_int(key, i /* ++ */);
array_set_key_value(host, BUF_PTR_LEN(key), ptr, colon-ptr);
}
}
}
static void mod_evhost_build_doc_root_path(buffer *b, array *parsed_host, buffer *authority, const buffer *path_pieces) {
array_reset_data_strings(parsed_host);
mod_evhost_parse_host(b, parsed_host, authority);
buffer_clear(b);
for (const char *ptr; (ptr = path_pieces->ptr); ++path_pieces) {
if (*ptr == '%') {
const 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_clen(&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, BUF_PTR_LEN(path_pieces)))) {
buffer_append_string_buffer(b, &ds->value);
} else {
/* unhandled %-sequence */
}
} else {
buffer_append_string_buffer(b, path_pieces);
}
}
buffer_append_slash(b);
}
static handler_t mod_evhost_uri_handler(request_st * const r, void *p_d) {
plugin_data *p = p_d;
/* not authority set */
if (buffer_is_blank(&r->uri.authority)) return HANDLER_GO_ON;
mod_evhost_patch_config(r, p);
/* missing even default(global) conf */
if (NULL == p->conf.path_pieces) return HANDLER_GO_ON;
buffer * const b = r->tmp_buf;/*(tmp_buf cleared before use in call below)*/
mod_evhost_build_doc_root_path(b, &p->split_vals, &r->uri.authority, p->conf.path_pieces);
if (!stat_cache_path_isdir(b)) {
log_perror(r->conf.errh, __FILE__, __LINE__, "%s", b->ptr);
} else {
buffer_copy_buffer(&r->physical.doc_root, b);
}
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 = "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;
return 0;
}