{"id":92099,"date":"2020-08-22T19:42:21","date_gmt":"2020-08-22T17:42:21","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dlya-chrome-razvivaetsya-api-dlya-pryamyh-tcp-i-udp-kommunikaczij"},"modified":"2020-08-22T19:42:21","modified_gmt":"2020-08-22T17:42:21","slug":"dlya-chrome-razvivaetsya-api-dlya-pryamyh-tcp-i-udp-kommunikaczij","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/dlya-chrome-razvivaetsya-api-dlya-pryamyh-tcp-i-udp-kommunikaczij","title":{"rendered":"Est\u00e1 em desenvolvimento uma API para comunica\u00e7\u00f5es diretas TCP e UDP para o Chrome","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A empresa Google iniciou<\/a><\/noindex> a implementa\u00e7\u00e3o de uma nova API no Chrome Raw Sockets<\/a><\/noindex>, permitindo que aplica\u00e7\u00f5es web estabele\u00e7am conex\u00f5es de rede diretas usando os protocolos TCP e UDP. Em 2015, o cons\u00f3rcio W3C j\u00e1 havia feito uma tentativa de padronizar a API «TCP and UDP Socket<\/a><\/noindex>«, mas os participantes do grupo de trabalho n\u00e3o chegaram a um consenso e o desenvolvimento dessa API foi interrompido.<\/p>\n

A necessidade de adicionar uma nova API se justifica pela possibilidade de intera\u00e7\u00e3o com dispositivos de rede que usam seus pr\u00f3prios protocolos, operando sobre TCP e UDP, e que n\u00e3o suportam intera\u00e7\u00f5es via HTTPS ou WebSockets. Destaca-se que a API Raw Sockets ir\u00e1 complementar os interfaces de programa\u00e7\u00e3o de baixo n\u00edvel j\u00e1 existentes no navegador, como WebUSB, WebMIDI e WebBluetooth, que permitem a intera\u00e7\u00e3o com dispositivos locais.<\/p>\n

Para evitar impactos negativos na seguran\u00e7a, a API Raw Sockets permitir\u00e1 acessos de rede apenas iniciados com o consentimento do usu\u00e1rio e restringidos a uma lista de hosts permitidos. O usu\u00e1rio dever\u00e1 confirmar explicitamente a primeira tentativa de conex\u00e3o com um novo host. Com uma flag especial, o usu\u00e1rio poder\u00e1 desativar a exibi\u00e7\u00e3o de novas solicita\u00e7\u00f5es de confirma\u00e7\u00e3o durante reconex\u00f5es ao mesmo host. Para prevenir ataques DDoS, a intensidade dos acessos atrav\u00e9s de Raw Sockets ser\u00e1 limitada, e o envio de solicita\u00e7\u00f5es ser\u00e1 poss\u00edvel apenas ap\u00f3s intera\u00e7\u00e3o do usu\u00e1rio com a p\u00e1gina. Pacotes UDP recebidos de hosts n\u00e3o aprovados pelo usu\u00e1rio ser\u00e3o ignorados e n\u00e3o chegar\u00e3o ao aplicativo web.<\/p>\n

A implementa\u00e7\u00e3o inicial n\u00e3o prev\u00ea a cria\u00e7\u00e3o de sockets de escuta, mas no futuro n\u00e3o se descarta a possibilidade de fornecer chamadas para aceitar conex\u00f5es inseridas de localhost ou de uma lista de hosts conhecidos. Tamb\u00e9m \u00e9 mencionada a necessidade de prote\u00e7\u00e3o contra ataques «DNS rebinding<\/a><\/noindex>» (o atacante pode, no n\u00edvel DNS, alterar o endere\u00e7o IP para um nome de dom\u00ednio aprovado pelo usu\u00e1rio e acessar outros hosts). O acesso a dom\u00ednios que resolvem para 127.0.0.0\/8 e redes intranet est\u00e1 planejado para ser bloqueado (acessos a localhost devem ser permitidos apenas com a inser\u00e7\u00e3o expl\u00edcita do endere\u00e7o IP na forma de confirma\u00e7\u00e3o).<\/p>\n

Entre os riscos que podem surgir com a implementa\u00e7\u00e3o de uma nova API, destaca-se a poss\u00edvel rejei\u00e7\u00e3o pelos fabricantes de outros navegadores, o que pode levar a problemas de compatibilidade. Os desenvolvedores dos motores Mozilla Gecko e WebKit ainda n\u00e3o formularam<\/a><\/noindex> sua posi\u00e7\u00e3o sobre a poss\u00edvel implementa\u00e7\u00e3o da API Raw Sockets, mas a Mozilla j\u00e1 havia proposto anteriormente uma API semelhante<\/a><\/noindex>. Se a API Raw Sockets for aprovada na primeira fase, ela ser\u00e1 ativada no Chrome OS, e somente depois ser\u00e1 oferecida aos usu\u00e1rios do Chrome em outras plataformas.<\/p>\n

Desenvolvedores web se manifestaram positivamente<\/a><\/noindex> sobre a nova API e apresentaram muitas novas ideias sobre sua aplica\u00e7\u00e3o em \u00e1reas em que a API XMLHttpRequest, WebSocket e WebRTC n\u00e3o s\u00e3o suficientes (desde a cria\u00e7\u00e3o de clientes de navegador para SSH, RDP, IMAP, SMTP, IRC e protocolos de impress\u00e3o at\u00e9 o desenvolvimento de sistemas distribu\u00eddos P2P com DHT (Tabela de Hash Distribu\u00edda), suporte a IPFS e intera\u00e7\u00e3o com protocolos espec\u00edficos de dispositivos IoT).<\/p>\n

<\/a><\/noindex><\/p>\n

Fonte: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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