| #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; | |
| char *p; | |
| size_t len; | |
| uintptr_t data; | |
| ngx_int_t rc, i, n, m; | |
| 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 < 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++ = 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; | |
| 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; | |
| 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; | |
| } |