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220 lines
4.5 KiB
C
220 lines
4.5 KiB
C
#include "cmd.h"
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#include "server.h"
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#include "conf.h"
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#include "acl.h"
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#include "formats/json.h"
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#include "formats/raw.h"
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#include "formats/custom-type.h"
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#include <stdlib.h>
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#include <string.h>
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#include <hiredis/hiredis.h>
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#include <ctype.h>
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struct cmd *
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cmd_new(struct evhttp_request *rq, int count) {
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struct cmd *c = calloc(1, sizeof(struct cmd));
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c->rq = rq;
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c->count = count;
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c->argv = calloc(1+count, sizeof(char*));
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c->argv_len = calloc(1+count, sizeof(size_t));
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return c;
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}
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void
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cmd_free(struct cmd *c) {
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free(c->argv);
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free(c->argv_len);
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free(c->mime);
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free(c->mimeKey);
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free(c);
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}
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/**
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* Detect disconnection of a pub/sub client. We need to clean up the command.
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*/
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void on_http_disconnect(struct evhttp_connection *evcon, void *ctx) {
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struct pubsub_client *ps = ctx;
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(void)evcon;
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if(ps->s->ac->replies.head) {
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struct cmd *cmd = ps->s->ac->replies.head->privdata;
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if(cmd) {
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cmd_free(cmd);
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}
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ps->s->ac->replies.head->privdata = NULL;
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}
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redisAsyncFree(ps->s->ac);
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free(ps);
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}
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/* taken from libevent */
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static char *
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decode_uri(const char *uri, size_t length, size_t *out_len, int always_decode_plus) {
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char c;
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size_t i, j;
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int in_query = always_decode_plus;
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char *ret = malloc(length);
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for (i = j = 0; i < length; i++) {
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c = uri[i];
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if (c == '?') {
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in_query = 1;
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} else if (c == '+' && in_query) {
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c = ' ';
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} else if (c == '%' && isxdigit((unsigned char)uri[i+1]) &&
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isxdigit((unsigned char)uri[i+2])) {
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char tmp[] = { uri[i+1], uri[i+2], '\0' };
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c = (char)strtol(tmp, NULL, 16);
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i += 2;
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}
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ret[j++] = c;
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}
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*out_len = (size_t)j;
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return ret;
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}
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int
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cmd_run(struct server *s, struct evhttp_request *rq,
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const char *uri, size_t uri_len) {
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char *qmark = strchr(uri, '?');
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char *slash = strchr(uri, '/');
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const char *p;
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int cmd_len;
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int param_count = 0, cur_param = 1, i;
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struct cmd *cmd;
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formatting_fun f_format;
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transform_fun f_transform = NULL;
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/* count arguments */
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if(qmark) {
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uri_len = qmark - uri;
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}
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for(p = uri; p && p < uri + uri_len; param_count++) {
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p = strchr(p+1, '/');
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}
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cmd = cmd_new(rq, param_count);
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if(slash) {
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cmd_len = slash - uri;
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} else {
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cmd_len = uri_len;
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}
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/* parse URI parameters */
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evhttp_parse_query(uri, &cmd->uri_params);
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/* get output formatting function */
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get_functions(cmd, &f_format, &f_transform);
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/* there is always a first parameter, it's the command name */
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cmd->argv[0] = uri;
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cmd->argv_len[0] = cmd_len;
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/* check that the client is able to run this command */
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if(!acl_allow_command(cmd, s->cfg, rq)) {
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return -1;
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}
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/* check if we have to split the connection */
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if(cmd_is_subscribe(cmd)) {
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struct pubsub_client *ps;
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ps = calloc(1, sizeof(struct pubsub_client));
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ps->s = s = server_copy(s);
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ps->rq = rq;
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evhttp_connection_set_closecb(rq->evcon, on_http_disconnect, ps);
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}
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if(!slash) {
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redisAsyncCommandArgv(s->ac, f_format, cmd, 1, cmd->argv, cmd->argv_len);
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return 0;
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}
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p = slash + 1;
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while(p < uri + uri_len) {
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const char *arg = p;
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int arg_len;
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char *next = strchr(arg, '/');
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if(next) { /* found a slash */
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arg_len = next - arg;
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p = next + 1;
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} else { /* last argument */
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arg_len = uri + uri_len - arg;
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p = uri + uri_len;
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}
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/* record argument */
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cmd->argv[cur_param] = decode_uri(arg, arg_len, &cmd->argv_len[cur_param], 1);
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cur_param++;
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}
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/* transform command if we need to. */
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if(f_transform) f_transform(cmd);
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redisAsyncCommandArgv(s->ac, f_format, cmd, cmd->count, cmd->argv, cmd->argv_len);
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for(i = 1; i < cur_param; ++i) {
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free((char*)cmd->argv[i]);
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}
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return 0;
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}
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void
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get_functions(struct cmd *cmd, formatting_fun *f_format, transform_fun *f_transform) {
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struct evkeyval *kv;
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/* defaults */
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*f_format = json_reply;
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*f_transform = NULL;
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/* check for JSONP */
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TAILQ_FOREACH(kv, &cmd->uri_params, next) {
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if(strcmp(kv->key, "format") == 0) {
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if(strcmp(kv->value, "raw") == 0) {
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*f_format = raw_reply;
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} else if(strcmp(kv->value, "json") == 0) {
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*f_format = json_reply;
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}
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break;
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} else if(strcmp(kv->key, "typeKey") == 0) { /* MIME type in key. */
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cmd->mimeKey = strdup(kv->value);
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*f_transform = custom_type_process_cmd;
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*f_format = custom_type_reply;
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} else if(strcmp(kv->key, "type") == 0) { /* MIME type in parameter */
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cmd->mime = strdup(kv->value);
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}
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}
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}
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int
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cmd_is_subscribe(struct cmd *cmd) {
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if(strncasecmp(cmd->argv[0], "SUBSCRIBE", cmd->argv_len[0]) == 0 ||
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strncasecmp(cmd->argv[0], "PSUBSCRIBE", cmd->argv_len[0]) == 0) {
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return 1;
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}
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return 0;
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}
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