Mercurial > hg > nginx-ranges
diff src/http/modules/ngx_http_rewrite_handler.c @ 0:f0b350454894 NGINX_0_1_0
nginx 0.1.0
*) The first public version.
author | Igor Sysoev <http://sysoev.ru> |
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date | Mon, 04 Oct 2004 00:00:00 +0400 |
parents | |
children | 46833bd150cb |
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new file mode 100644 --- /dev/null +++ b/src/http/modules/ngx_http_rewrite_handler.c @@ -0,0 +1,466 @@ + +/* + * Copyright (C) Igor Sysoev + */ + + +#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; + + ngx_uint_t status; + unsigned last:1; +} ngx_http_rewrite_rule_t; + + +typedef struct { + ngx_array_t rules; + ngx_flag_t log; +} ngx_http_rewrite_srv_conf_t; + + +typedef struct { + ngx_str_t redirect; +} ngx_http_rewrite_loc_conf_t; + + +static void *ngx_http_rewrite_create_srv_conf(ngx_conf_t *cf); +static char *ngx_http_rewrite_merge_srv_conf(ngx_conf_t *cf, + void *parent, void *child); +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 char *ngx_http_redirect(ngx_conf_t *cf, void *post, void *data); +static ngx_int_t ngx_http_rewrite_init(ngx_cycle_t *cycle); + + +static ngx_conf_post_handler_pt ngx_http_redirect_p = ngx_http_redirect; + + +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_string("redirect"), + NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_str_slot, + NGX_HTTP_LOC_CONF_OFFSET, + 0, + &ngx_http_redirect_p }, + + { ngx_string("rewrite_log"), + NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1, + ngx_conf_set_flag_slot, + NGX_HTTP_SRV_CONF_OFFSET, + offsetof(ngx_http_rewrite_srv_conf_t, log), + 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_srv_conf, /* create server configuration */ + ngx_http_rewrite_merge_srv_conf, /* merge server configuration */ + + ngx_http_rewrite_create_loc_conf, /* 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 \"%s\"", + rule[i].re_name.data, r->uri.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 \"%s\"", + rule[i].re_name.data, r->uri.data); + } + + if (rule[i].status) { + return rule[i].status; + } + + 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 ngx_int_t ngx_http_redirect_handler(ngx_http_request_t *r) +{ + u_char *p; + ngx_http_rewrite_loc_conf_t *rlcf; + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "http redirect handler"); + + rlcf = ngx_http_get_module_loc_conf(r, ngx_http_rewrite_module); + + r->headers_out.location = ngx_list_push(&r->headers_out.headers); + if (r->headers_out.location == NULL) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + if (rlcf->redirect.data[0] != '/') { + r->headers_out.location->key.len = sizeof("Location") - 1; + r->headers_out.location->key.data = (u_char *) "Location"; + } + + r->headers_out.location->value.len = rlcf->redirect.len + + r->unparsed_uri.len; + r->headers_out.location->value.data = ngx_palloc(r->pool, + r->headers_out.location->value.len); + + if (r->headers_out.location->value.data == NULL) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + p = ngx_cpymem(r->headers_out.location->value.data, rlcf->redirect.data, + rlcf->redirect.len); + p = ngx_cpystrn(p, r->unparsed_uri.data + 1, r->unparsed_uri.len); + + return NGX_HTTP_MOVED_TEMPORARILY; +} + + +static void *ngx_http_rewrite_create_srv_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 = NGX_CONF_UNSET; + + return conf; +} + + +static char *ngx_http_rewrite_merge_srv_conf(ngx_conf_t *cf, + void *parent, void *child) +{ + ngx_http_rewrite_srv_conf_t *prev = parent; + ngx_http_rewrite_srv_conf_t *conf = child; + + ngx_conf_merge_value(conf->log, prev->log, 0); + + return NGX_CONF_OK; +} + + +static void *ngx_http_rewrite_create_loc_conf(ngx_conf_t *cf) +{ + ngx_http_rewrite_loc_conf_t *conf; + + if (!(conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_rewrite_loc_conf_t)))) { + return NGX_CONF_ERROR; + } + + 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; + rule->status = 0; + rule->last = 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]; + + if (ngx_strcasecmp(value[2].data, "forbidden:") == 0) { + + if (cf->args->nelts == 3) { + rule->status = NGX_HTTP_FORBIDDEN; + rule->last = 1; + return NGX_CONF_OK; + } + + ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, + "invalid parameter \"%s\"", value[3].data); + return NGX_CONF_ERROR; + } + + 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 char *ngx_http_redirect(ngx_conf_t *cf, void *post, void *data) +{ + ngx_http_core_loc_conf_t *clcf; + + clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module); + clcf->handler = ngx_http_redirect_handler; + + return NGX_CONF_OK; +} + + +static ngx_int_t ngx_http_rewrite_init(ngx_cycle_t *cycle) +{ + ngx_http_handler_pt *h; + ngx_http_core_main_conf_t *cmcf; + + cmcf = ngx_http_cycle_get_module_main_conf(cycle, ngx_http_core_module); + + 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; +}