Mercurial > hg > nginx-vendor-0-8
view src/imap/ngx_imap_handler.c @ 103:acdd83ee07cb
Added tag NGINX_0_2_5 for changeset f63280c59dd5
author | Igor Sysoev <http://sysoev.ru> |
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date | Tue, 04 Oct 2005 00:00:00 +0400 |
parents | ca4f70b3ccc6 |
children | e38f51cd0905 |
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/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_event.h> #include <ngx_imap.h> static void ngx_imap_init_session(ngx_connection_t *c); static void ngx_imap_init_protocol(ngx_event_t *rev); static ngx_int_t ngx_imap_read_command(ngx_imap_session_t *s); static u_char *ngx_imap_log_error(ngx_log_t *log, u_char *buf, size_t len); #if (NGX_IMAP_SSL) static void ngx_imap_ssl_handshake_handler(ngx_connection_t *c); static void ngx_imap_ssl_close_handler(ngx_event_t *ev); #endif static ngx_str_t greetings[] = { ngx_string("+OK POP3 ready" CRLF), ngx_string("* OK IMAP4 ready" CRLF) }; static ngx_str_t internal_server_errors[] = { ngx_string("-ERR internal server error" CRLF), ngx_string("* BAD internal server error" CRLF), }; static u_char pop3_ok[] = "+OK" CRLF; static u_char pop3_invalid_command[] = "-ERR invalid command" CRLF; static u_char imap_star[] = "* "; static u_char imap_ok[] = "OK completed" CRLF; static u_char imap_next[] = "+ OK" CRLF; static u_char imap_bye[] = "* BYE" CRLF; static u_char imap_invalid_command[] = "BAD invalid command" CRLF; void ngx_imap_init_connection(ngx_connection_t *c) { ngx_imap_log_ctx_t *lctx; #if (NGX_IMAP_SSL) ngx_imap_conf_ctx_t *ctx; ngx_imap_ssl_conf_t *sslcf; ngx_imap_core_srv_conf_t *cscf; #endif ngx_log_error(NGX_LOG_INFO, c->log, 0, "*%ui client %V connected to %V", c->number, &c->addr_text, &c->listening->addr_text); lctx = ngx_palloc(c->pool, sizeof(ngx_imap_log_ctx_t)); if (lctx == NULL) { ngx_imap_close_connection(c); return; } lctx->client = &c->addr_text; lctx->session = NULL; c->log->connection = c->number; c->log->handler = ngx_imap_log_error; c->log->data = lctx; c->log->action = "sending client greeting line"; c->log_error = NGX_ERROR_INFO; #if (NGX_IMAP_SSL) ctx = c->ctx; sslcf = ngx_imap_get_module_srv_conf(ctx, ngx_imap_ssl_module); if (sslcf->enable) { if (ngx_ssl_create_connection(&sslcf->ssl, c, 0) == NGX_ERROR) { ngx_imap_close_connection(c); return; } if (ngx_ssl_handshake(c) == NGX_AGAIN) { cscf = ngx_imap_get_module_srv_conf(ctx, ngx_imap_core_module); ngx_add_timer(c->read, cscf->timeout); c->ssl->handler = ngx_imap_ssl_handshake_handler; return; } ngx_imap_ssl_handshake_handler(c); return; } #endif ngx_imap_init_session(c); } #if (NGX_IMAP_SSL) static void ngx_imap_ssl_handshake_handler(ngx_connection_t *c) { if (c->ssl->handshaked) { ngx_imap_init_session(c); return; } ngx_imap_close_connection(c); return; } #endif static void ngx_imap_init_session(ngx_connection_t *c) { ngx_imap_session_t *s; ngx_imap_log_ctx_t *lctx; ngx_imap_conf_ctx_t *ctx; ngx_imap_core_srv_conf_t *cscf; c->read->handler = ngx_imap_init_protocol; c->write->handler = ngx_imap_send; s = ngx_pcalloc(c->pool, sizeof(ngx_imap_session_t)); if (s == NULL) { ngx_imap_close_connection(c); return; } ctx = c->ctx; cscf = ngx_imap_get_module_srv_conf(ctx, ngx_imap_core_module); c->data = s; s->connection = c; s->protocol = cscf->protocol; s->ctx = ngx_pcalloc(c->pool, sizeof(void *) * ngx_imap_max_module); if (s->ctx == NULL) { ngx_imap_session_internal_server_error(s); return; } s->main_conf = ctx->main_conf; s->srv_conf = ctx->srv_conf; s->out = greetings[s->protocol]; lctx = c->log->data; lctx->session = s; ngx_add_timer(c->read, cscf->timeout); if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) { ngx_imap_close_connection(c); } ngx_imap_send(c->write); } void ngx_imap_send(ngx_event_t *wev) { ngx_int_t n; ngx_connection_t *c; ngx_imap_session_t *s; ngx_imap_core_srv_conf_t *cscf; c = wev->data; s = c->data; if (wev->timedout) { ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out"); ngx_imap_close_connection(c); return; } if (s->out.len == 0) { if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) { ngx_imap_close_connection(c); } return; } n = c->send(c, s->out.data, s->out.len); if (n > 0) { s->out.len -= n; if (wev->timer_set) { ngx_del_timer(wev); } if (s->quit) { ngx_imap_close_connection(c); return; } if (s->blocked) { c->read->handler(c->read); } return; } if (n == NGX_ERROR) { ngx_imap_close_connection(c); return; } /* n == NGX_AGAIN */ cscf = ngx_imap_get_module_srv_conf(s, ngx_imap_core_module); ngx_add_timer(c->write, cscf->timeout); if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) { ngx_imap_close_connection(c); return; } } static void ngx_imap_init_protocol(ngx_event_t *rev) { size_t size; ngx_connection_t *c; ngx_imap_session_t *s; ngx_imap_core_srv_conf_t *cscf; c = rev->data; c->log->action = "in auth state"; if (rev->timedout) { ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out"); ngx_imap_close_connection(c); return; } s = c->data; if (ngx_array_init(&s->args, c->pool, 2, sizeof(ngx_str_t)) == NGX_ERROR) { ngx_imap_session_internal_server_error(s); return; } if (s->protocol == NGX_IMAP_POP3_PROTOCOL) { size = 128; s->imap_state = ngx_pop3_start; c->read->handler = ngx_pop3_auth_state; } else { cscf = ngx_imap_get_module_srv_conf(s, ngx_imap_core_module); size = cscf->imap_client_buffer_size; s->imap_state = ngx_imap_start; c->read->handler = ngx_imap_auth_state; } s->buffer = ngx_create_temp_buf(c->pool, size); if (s->buffer == NULL) { ngx_imap_session_internal_server_error(s); return; } c->read->handler(rev); } void ngx_imap_auth_state(ngx_event_t *rev) { u_char *text, *last, *p, *dst, *src, *end; ssize_t text_len, last_len; ngx_str_t *arg; ngx_int_t rc; ngx_uint_t tag, i; ngx_connection_t *c; ngx_imap_session_t *s; ngx_imap_core_srv_conf_t *cscf; c = rev->data; s = c->data; ngx_log_debug0(NGX_LOG_DEBUG_IMAP, c->log, 0, "imap auth state"); if (rev->timedout) { ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out"); ngx_imap_close_connection(c); return; } if (s->out.len) { ngx_log_debug0(NGX_LOG_DEBUG_IMAP, c->log, 0, "imap send handler busy"); s->blocked = 1; return; } s->blocked = 0; rc = ngx_imap_read_command(s); ngx_log_debug1(NGX_LOG_DEBUG_IMAP, c->log, 0, "imap auth: %i", rc); if (rc == NGX_AGAIN || rc == NGX_ERROR) { return; } tag = 1; text = NULL; text_len = 0; last = imap_ok; last_len = sizeof(imap_ok) - 1; if (rc == NGX_OK) { ngx_log_debug1(NGX_LOG_DEBUG_IMAP, c->log, 0, "imap auth command: %i", s->command); if (s->backslash) { arg = s->args.elts; for (i = 0; i < s->args.nelts; i++) { dst = arg[i].data; end = dst + arg[i].len; for (src = dst; src < end; dst++) { *dst = *src; if (*src++ == '\\') { *dst = *src++; } } arg[i].len = dst - arg[i].data; } s->backslash = 0; } switch (s->command) { case NGX_IMAP_LOGIN: if (s->args.nelts == 2) { arg = s->args.elts; s->login.len = arg[0].len; s->login.data = ngx_palloc(c->pool, s->login.len); if (s->login.data == NULL) { ngx_imap_session_internal_server_error(s); return; } ngx_memcpy(s->login.data, arg[0].data, s->login.len); s->passwd.len = arg[1].len; s->passwd.data = ngx_palloc(c->pool, s->passwd.len); if (s->passwd.data == NULL) { ngx_imap_session_internal_server_error(s); return; } ngx_memcpy(s->passwd.data, arg[1].data, s->passwd.len); #if (NGX_DEBUG_IMAP_PASSWD) ngx_log_debug2(NGX_LOG_DEBUG_IMAP, c->log, 0, "imap login:\"%V\" passwd:\"%V\"", &s->login, &s->passwd); #else ngx_log_debug1(NGX_LOG_DEBUG_IMAP, c->log, 0, "imap login:\"%V\"", &s->login); #endif s->args.nelts = 0; s->buffer->pos = s->buffer->start; s->buffer->last = s->buffer->start; if (rev->timer_set) { ngx_del_timer(rev); } s->login_attempt++; ngx_imap_auth_http_init(s); return; } else { rc = NGX_IMAP_PARSE_INVALID_COMMAND; } break; case NGX_IMAP_CAPABILITY: cscf = ngx_imap_get_module_srv_conf(s, ngx_imap_core_module); text = cscf->imap_capability->pos; text_len = cscf->imap_capability->last - cscf->imap_capability->pos; break; case NGX_IMAP_LOGOUT: s->quit = 1; text = imap_bye; text_len = sizeof(imap_bye) - 1; break; case NGX_IMAP_NOOP: break; default: rc = NGX_IMAP_PARSE_INVALID_COMMAND; break; } } else if (rc == NGX_IMAP_NEXT) { last = imap_next; last_len = sizeof(imap_next) - 1; tag = 0; } if (rc == NGX_IMAP_PARSE_INVALID_COMMAND) { last = imap_invalid_command; last_len = sizeof(imap_invalid_command) - 1; } if (tag) { if (s->tag.len == 0) { s->tag.len = sizeof(imap_star) - 1; s->tag.data = (u_char *) imap_star; } if (s->tagged_line.len < s->tag.len + text_len + last_len) { s->tagged_line.len = s->tag.len + text_len + last_len; s->tagged_line.data = ngx_palloc(c->pool, s->tagged_line.len); if (s->tagged_line.data == NULL) { ngx_imap_close_connection(c); return; } } s->out.data = s->tagged_line.data; s->out.len = s->tag.len + text_len + last_len; p = s->out.data; if (text) { p = ngx_cpymem(p, text, text_len); } p = ngx_cpymem(p, s->tag.data, s->tag.len); ngx_memcpy(p, last, last_len); } else { s->out.data = last; s->out.len = last_len; } if (rc != NGX_IMAP_NEXT) { s->args.nelts = 0; s->buffer->pos = s->buffer->start; s->buffer->last = s->buffer->start; s->tag.len = 0; } ngx_imap_send(c->write); } void ngx_pop3_auth_state(ngx_event_t *rev) { u_char *text; ssize_t size; ngx_int_t rc; ngx_str_t *arg; ngx_connection_t *c; ngx_imap_session_t *s; ngx_imap_core_srv_conf_t *cscf; c = rev->data; s = c->data; ngx_log_debug0(NGX_LOG_DEBUG_IMAP, c->log, 0, "pop3 auth state"); if (rev->timedout) { ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out"); ngx_imap_close_connection(c); return; } if (s->out.len) { ngx_log_debug0(NGX_LOG_DEBUG_IMAP, c->log, 0, "imap send handler busy"); s->blocked = 1; return; } s->blocked = 0; rc = ngx_imap_read_command(s); if (rc == NGX_AGAIN || rc == NGX_ERROR) { return; } text = pop3_ok; size = sizeof(pop3_ok) - 1; if (rc == NGX_OK) { switch (s->imap_state) { case ngx_pop3_start: switch (s->command) { case NGX_POP3_USER: if (s->args.nelts == 1) { s->imap_state = ngx_pop3_user; arg = s->args.elts; s->login.len = arg[0].len; s->login.data = ngx_palloc(c->pool, s->login.len); if (s->login.data == NULL) { ngx_imap_session_internal_server_error(s); return; } ngx_memcpy(s->login.data, arg[0].data, s->login.len); ngx_log_debug1(NGX_LOG_DEBUG_IMAP, c->log, 0, "pop3 login: \"%V\"", &s->login); } else { rc = NGX_IMAP_PARSE_INVALID_COMMAND; } break; case NGX_POP3_CAPA: cscf = ngx_imap_get_module_srv_conf(s, ngx_imap_core_module); text = cscf->pop3_capability->pos; size = cscf->pop3_capability->last - cscf->pop3_capability->pos; break; case NGX_POP3_QUIT: s->quit = 1; break; case NGX_POP3_NOOP: break; default: s->imap_state = ngx_pop3_start; rc = NGX_IMAP_PARSE_INVALID_COMMAND; break; } break; case ngx_pop3_user: switch (s->command) { case NGX_POP3_PASS: if (s->args.nelts == 1) { /* STUB */ s->imap_state = ngx_pop3_start; arg = s->args.elts; s->passwd.len = arg[0].len; s->passwd.data = ngx_palloc(c->pool, s->passwd.len); if (s->passwd.data == NULL) { ngx_imap_session_internal_server_error(s); return; } ngx_memcpy(s->passwd.data, arg[0].data, s->passwd.len); #if (NGX_DEBUG_IMAP_PASSWD) ngx_log_debug1(NGX_LOG_DEBUG_IMAP, c->log, 0, "pop3 passwd: \"%V\"", &s->passwd); #endif s->args.nelts = 0; s->buffer->pos = s->buffer->start; s->buffer->last = s->buffer->start; if (rev->timer_set) { ngx_del_timer(rev); } ngx_imap_auth_http_init(s); return; } else { rc = NGX_IMAP_PARSE_INVALID_COMMAND; } break; case NGX_POP3_CAPA: cscf = ngx_imap_get_module_srv_conf(s, ngx_imap_core_module); text = cscf->pop3_capability->pos; size = cscf->pop3_capability->last - cscf->pop3_capability->pos; break; case NGX_POP3_QUIT: s->quit = 1; break; case NGX_POP3_NOOP: break; default: s->imap_state = ngx_pop3_start; rc = NGX_IMAP_PARSE_INVALID_COMMAND; break; } break; /* suppress warinings */ case ngx_pop3_passwd: break; } } if (rc == NGX_IMAP_PARSE_INVALID_COMMAND) { text = pop3_invalid_command; size = sizeof(pop3_invalid_command) - 1; } s->args.nelts = 0; s->buffer->pos = s->buffer->start; s->buffer->last = s->buffer->start; s->out.data = text; s->out.len = size; ngx_imap_send(c->write); } static ngx_int_t ngx_imap_read_command(ngx_imap_session_t *s) { ssize_t n; ngx_int_t rc; n = s->connection->recv(s->connection, s->buffer->last, s->buffer->end - s->buffer->last); if (n == NGX_ERROR || n == 0) { ngx_imap_close_connection(s->connection); return NGX_ERROR; } if (n > 0) { s->buffer->last += n; } if (n == NGX_AGAIN) { if (ngx_handle_read_event(s->connection->read, 0) == NGX_ERROR) { ngx_imap_session_internal_server_error(s); return NGX_ERROR; } return NGX_AGAIN; } if (s->protocol == NGX_IMAP_POP3_PROTOCOL) { rc = ngx_pop3_parse_command(s); } else { rc = ngx_imap_parse_command(s); } if (rc == NGX_AGAIN || rc == NGX_IMAP_NEXT || rc == NGX_IMAP_PARSE_INVALID_COMMAND) { return rc; } if (rc == NGX_ERROR) { ngx_imap_close_connection(s->connection); return NGX_ERROR; } return NGX_OK; } void ngx_imap_session_internal_server_error(ngx_imap_session_t *s) { s->out = internal_server_errors[s->protocol]; s->quit = 1; ngx_imap_send(s->connection->write); } void ngx_imap_close_connection(ngx_connection_t *c) { ngx_pool_t *pool; ngx_log_debug1(NGX_LOG_DEBUG_IMAP, c->log, 0, "close imap connection: %d", c->fd); #if (NGX_IMAP_SSL) if (c->ssl) { if (ngx_ssl_shutdown(c) == NGX_AGAIN) { c->read->handler = ngx_imap_ssl_close_handler; c->write->handler = ngx_imap_ssl_close_handler; return; } } #endif c->closed = 1; pool = c->pool; ngx_close_connection(c); ngx_destroy_pool(pool); } #if (NGX_IMAP_SSL) static void ngx_imap_ssl_close_handler(ngx_event_t *ev) { ngx_connection_t *c; c = ev->data; ngx_log_debug0(NGX_LOG_DEBUG_IMAP, ev->log, 0, "http ssl close handler"); if (ngx_ssl_shutdown(c) == NGX_AGAIN) { return; } ngx_imap_close_connection(c); } #endif static u_char * ngx_imap_log_error(ngx_log_t *log, u_char *buf, size_t len) { u_char *p; ngx_imap_session_t *s; ngx_imap_log_ctx_t *ctx; if (log->action) { p = ngx_snprintf(buf, len, " while %s", log->action); len -= p - buf; buf = p; } ctx = log->data; p = ngx_snprintf(buf, len, ", client: %V", ctx->client); len -= p - buf; buf = p; s = ctx->session; if (s == NULL) { return p; } p = ngx_snprintf(buf, len, ", server: %V", &s->connection->listening->addr_text); len -= p - buf; buf = p; if (s->login.len == 0) { return p; } p = ngx_snprintf(buf, len, ", login: \"%V\"", &s->login); len -= p - buf; buf = p; if (s->proxy == NULL) { return p; } p = ngx_snprintf(buf, len, ", upstream: %V", &s->proxy->upstream.peers->peer[0].name); return p; }