nginx/src/http/modules/ngx_http_rewrite_handler.c
2004-03-16 07:10:12 +00:00

344 lines
9.1 KiB
C

#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#define NGX_HTTP_REWRITE_COPY_MATCH 0
#define NGX_HTTP_REWRITE_COPY_SHORT 1
#define NGX_HTTP_REWRITE_COPY_LONG 2
typedef struct {
ngx_int_t op;
size_t len;
uintptr_t data;
} ngx_http_rewrite_op_t;
typedef struct {
ngx_regex_t *regex;
ngx_uint_t msize;
ngx_array_t ops;
ngx_uint_t size;
ngx_str_t re_name;
ngx_str_t s_name;
unsigned last:1;
} ngx_http_rewrite_rule_t;
typedef struct {
ngx_array_t rules;
unsigned log:1;
} ngx_http_rewrite_srv_conf_t;
static void *ngx_http_rewrite_create_loc_conf(ngx_conf_t *cf);
static char *ngx_http_rewrite_rule(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static ngx_int_t ngx_http_rewrite_init(ngx_cycle_t *cycle);
static ngx_command_t ngx_http_rewrite_commands[] = {
{ ngx_string("rewrite"),
NGX_HTTP_SRV_CONF|NGX_CONF_TAKE23,
ngx_http_rewrite_rule,
NGX_HTTP_SRV_CONF_OFFSET,
0,
NULL },
ngx_null_command
};
ngx_http_module_t ngx_http_rewrite_module_ctx = {
NULL, /* pre conf */
NULL, /* create main configuration */
NULL, /* init main configuration */
ngx_http_rewrite_create_loc_conf, /* create server configuration */
NULL, /* merge server configuration */
NULL, /* create location configration */
NULL, /* merge location configration */
};
ngx_module_t ngx_http_rewrite_module = {
NGX_MODULE,
&ngx_http_rewrite_module_ctx, /* module context */
ngx_http_rewrite_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
ngx_http_rewrite_init, /* init module */
NULL /* init child */
};
static ngx_int_t ngx_http_rewrite_handler(ngx_http_request_t *r)
{
int *matches;
u_char *p;
size_t len;
uintptr_t data;
ngx_int_t rc;
ngx_uint_t i, m, n;
ngx_str_t uri;
ngx_http_rewrite_op_t *op;
ngx_http_rewrite_rule_t *rule;
ngx_http_rewrite_srv_conf_t *scf;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http rewrite handler");
scf = ngx_http_get_module_srv_conf(r, ngx_http_rewrite_module);
rule = scf->rules.elts;
for (i = 0; i < scf->rules.nelts; i++) {
if (rule[i].msize) {
if (!(matches = ngx_palloc(r->pool, rule[i].msize * sizeof(int)))) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
} else {
matches = NULL;
}
rc = ngx_regex_exec(rule[i].regex, &r->uri, matches, rule[i].msize);
if (rc == NGX_DECLINED) {
if (scf->log) {
ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0,
"\"%s\" does not match", rule[i].re_name.data);
}
continue;
}
if (rc < 0) {
ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
ngx_regex_exec_n
" failed: %d on \"%s\" using \"%s\"",
rc, r->uri.data, rule[i].re_name.data);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if (scf->log) {
ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0,
"\"%s\" matches", rule[i].re_name.data);
}
uri.len = rule[i].size;
for (n = 1; n < (ngx_uint_t) rc; n++) {
uri.len += matches[2 * n + 1] - matches[2 * n];
}
if (!(uri.data = ngx_palloc(r->pool, uri.len + 1))) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
p = uri.data;
op = rule[i].ops.elts;
for (n = 0; n < rule[i].ops.nelts; n++) {
if (op[n].op == NGX_HTTP_REWRITE_COPY_SHORT) {
len = op[n].len;
data = op[n].data;
while (len--) {
*p++ = (char) (data & 0xff);
data >>= 8;
}
} else if (op[n].op == NGX_HTTP_REWRITE_COPY_LONG) {
p = ngx_cpymem(p, (void *) op[n].data, op[n].len);
} else { /* NGX_HTTP_REWRITE_COPY_MATCH */
m = 2 * op[n].data;
p = ngx_cpymem(p, &r->uri.data[matches[m]],
matches[m + 1] - matches[m]);
}
}
*p = '\0';
if (scf->log) {
ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0,
"rewritten uri: \"%s\"", uri.data);
}
r->uri = uri;
if (ngx_http_set_exten(r) != NGX_OK) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if (rule[i].last) {
return NGX_DECLINED;
}
}
return NGX_DECLINED;
}
static void *ngx_http_rewrite_create_loc_conf(ngx_conf_t *cf)
{
ngx_http_rewrite_srv_conf_t *conf;
if (!(conf = ngx_palloc(cf->pool, sizeof(ngx_http_rewrite_srv_conf_t)))) {
return NGX_CONF_ERROR;
}
ngx_init_array(conf->rules, cf->pool, 5, sizeof(ngx_http_rewrite_rule_t),
NGX_CONF_ERROR);
conf->log = 1;
return conf;
}
static char *ngx_http_rewrite_rule(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf)
{
ngx_http_rewrite_srv_conf_t *scf = conf;
u_char *data, *p;
size_t len;
ngx_str_t *value, err;
ngx_uint_t i;
ngx_http_rewrite_op_t *op;
ngx_http_rewrite_rule_t *rule;
u_char errstr[NGX_MAX_CONF_ERRSTR];
if (!(rule = ngx_push_array(&scf->rules))) {
return NGX_CONF_ERROR;
}
ngx_init_array(rule->ops, cf->pool, 5, sizeof(ngx_http_rewrite_op_t),
NGX_CONF_ERROR);
rule->msize = 0;
rule->size = 0;
value = cf->args->elts;
/* STUB */ {
err.len = NGX_MAX_CONF_ERRSTR;
err.data = errstr;
rule->regex = ngx_regex_compile(&value[1], 0, cf->pool, &err);
if (rule->regex == NULL) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%s", err.data);
return NGX_CONF_ERROR;
}
rule->re_name = value[1];
rule->s_name = value[2];
for (i = 0; i < value[2].len; /* void */) {
if (!(op = ngx_push_array(&rule->ops))) {
return NGX_CONF_ERROR;
}
data = &value[2].data[i];
if (value[2].data[i] == '$'
&& i < value[2].len
&& value[2].data[i + 1] >= '1'
&& value[2].data[i + 1] <= '9')
{
op->op = NGX_HTTP_REWRITE_COPY_MATCH;
op->data = value[2].data[++i] - '0';
if (rule->msize < op->data) {
rule->msize = op->data;
}
i++;
} else {
i++;
while (i < value[2].len && value[2].data[i] != '$') {
i++;
}
len = &value[2].data[i] - data;
rule->size += len;
if (len) {
op->len = len;
if (len <= sizeof(uintptr_t)) {
op->op = NGX_HTTP_REWRITE_COPY_SHORT;
op->data = 0;
while (len--) {
op->data <<= 8;
op->data |= data[len];
}
} else {
op->op = NGX_HTTP_REWRITE_COPY_LONG;
if (!(p = ngx_palloc(cf->pool, len))) {
return NGX_CONF_ERROR;
}
ngx_memcpy(p, data, len);
op->data = (uintptr_t) p;
}
}
}
}
if (rule->msize) {
rule->msize++;
rule->msize *= 3;
}
if (cf->args->nelts > 3) {
if (ngx_strcmp(value[3].data, "last") == 0) {
rule->last = 1;
} else {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid parameter \"%s\"", value[3].data);
return NGX_CONF_ERROR;
}
}
}
return NGX_CONF_OK;
}
static ngx_int_t ngx_http_rewrite_init(ngx_cycle_t *cycle)
{
ngx_http_handler_pt *h;
ngx_http_conf_ctx_t *ctx;
ngx_http_core_main_conf_t *cmcf;
ctx = (ngx_http_conf_ctx_t *) cycle->conf_ctx[ngx_http_module.index];
cmcf = ctx->main_conf[ngx_http_core_module.ctx_index];
h = ngx_push_array(&cmcf->phases[NGX_HTTP_REWRITE_PHASE].handlers);
if (h == NULL) {
return NGX_ERROR;
}
*h = ngx_http_rewrite_handler;
return NGX_OK;
}