diff options
Diffstat (limited to 'louloulibs/xmpp')
| -rw-r--r-- | louloulibs/xmpp/jid.cpp | 74 |
1 files changed, 63 insertions, 11 deletions
diff --git a/louloulibs/xmpp/jid.cpp b/louloulibs/xmpp/jid.cpp index 7b62f3e..d17d4e9 100644 --- a/louloulibs/xmpp/jid.cpp +++ b/louloulibs/xmpp/jid.cpp @@ -6,6 +6,9 @@ #include <louloulibs.h> #ifdef LIBIDN_FOUND #include <stringprep.h> + #include <netdb.h> + #include <utils/scopeguard.hpp> + #include <set> #endif #include <logger/logger.hpp> @@ -58,19 +61,68 @@ std::string jidprep(const std::string& original) char domain[max_jid_part_len] = {}; memcpy(domain, jid.domain.data(), std::min(max_jid_part_len, jid.domain.size())); - rc = static_cast<Stringprep_rc>(::stringprep(domain, max_jid_part_len, - static_cast<Stringprep_profile_flags>(0), stringprep_nameprep)); - if (rc != STRINGPREP_OK) + { - log_error(error_msg + stringprep_strerror(rc)); - return ""; + // Using getaddrinfo, check if the domain part is a valid IPv4 (then use + // it as is), or IPv6 (surround it with []), or a domain name (run + // nameprep) + struct addrinfo hints; + memset(&hints, 0, sizeof(hints)); + hints.ai_flags = AI_NUMERICHOST; + hints.ai_family = AF_UNSPEC; + + struct addrinfo* res = nullptr; + auto addrinfo_deleter = utils::make_scope_guard([res]() { if (res) freeaddrinfo(res); }); + if (::getaddrinfo(domain, nullptr, &hints, &res) || !res || + (res->ai_family != AF_INET && res->ai_family != AF_INET6)) + { // Not an IP, run nameprep on it + rc = static_cast<Stringprep_rc>(::stringprep(domain, max_jid_part_len, + static_cast<Stringprep_profile_flags>(0), stringprep_nameprep)); + if (rc != STRINGPREP_OK) + { + log_error(error_msg + stringprep_strerror(rc)); + return ""; + } + + // Make sure it contains only allowed characters + using std::begin; + using std::end; + char* domain_end = domain + ::strlen(domain); + std::replace_if(std::begin(domain), domain + ::strlen(domain), + [](const char c) -> bool + { + return !((c >= 'a' && c <= 'z') || c == '-' || + (c >= '0' && c <= '9') || c == '.'); + }, '-'); + // Make sure there are no doubled - or . + std::set<char> special_chars{'-', '.'}; + domain_end = std::unique(begin(domain), domain + ::strlen(domain), [&special_chars](const char& a, const char& b) -> bool + { + return special_chars.count(a) && special_chars.count(b); + }); + // remove leading and trailing -. if any + if (domain_end != domain && special_chars.count(*(domain_end - 1))) + --domain_end; + if (domain_end != domain && special_chars.count(domain[0])) + { + std::memmove(domain, domain + 1, domain_end - domain + 1); + --domain_end; + } + // And if the final result is an empty string, return a dummy hostname + if (domain_end == domain) + ::strcpy(domain, "empty"); + else + *domain_end = '\0'; + } + else if (res->ai_family == AF_INET6) + { // IPv6, surround it with []. The length is always enough: + // the longest possible IPv6 is way shorter than max_jid_part_len + ::memmove(domain + 1, domain, jid.domain.size()); + domain[0] = '['; + domain[jid.domain.size() + 1] = ']'; + } } - std::replace_if(std::begin(domain), domain + ::strlen(domain), - [](const char c) -> bool - { - return !((c >= 'a' && c <= 'z') || c == '-' || - (c >= '0' && c <= '9') || c == '.'); - }, '-'); + // If there is no resource, stop here if (jid.resource.empty()) |