Mercurial > dovecot > core-2.2
view src/imap/main.c @ 14682:d0d7b810646b
Make sure we check all the functions' return values. Minor API changes to simplify this.
Checked using a patched clang that adds attribute(warn_unused_result) to all
functions. This commit fixes several error handling mistakes.
author | Timo Sirainen <tss@iki.fi> |
---|---|
date | Mon, 25 Jun 2012 01:14:03 +0300 |
parents | 91438eb4fad8 |
children | 7c058aa05b0a |
line wrap: on
line source
/* Copyright (c) 2002-2012 Dovecot authors, see the included COPYING file */ #include "imap-common.h" #include "ioloop.h" #include "istream.h" #include "ostream.h" #include "abspath.h" #include "str.h" #include "base64.h" #include "process-title.h" #include "restrict-access.h" #include "fd-close-on-exec.h" #include "master-interface.h" #include "master-service.h" #include "master-login.h" #include "mail-user.h" #include "mail-storage-service.h" #include "imap-resp-code.h" #include "imap-commands.h" #include "imap-fetch.h" #include <stdio.h> #include <stdlib.h> #include <unistd.h> #define IS_STANDALONE() \ (getenv(MASTER_IS_PARENT_ENV) == NULL) #define IMAP_DIE_IDLE_SECS 10 static bool verbose_proctitle = FALSE; static struct mail_storage_service_ctx *storage_service; static struct master_login *master_login = NULL; imap_client_created_func_t *hook_client_created = NULL; imap_client_created_func_t * imap_client_created_hook_set(imap_client_created_func_t *new_hook) { imap_client_created_func_t *old_hook = hook_client_created; hook_client_created = new_hook; return old_hook; } void imap_refresh_proctitle(void) { #define IMAP_PROCTITLE_PREFERRED_LEN 80 struct client *client; struct client_command_context *cmd; string_t *title = t_str_new(128); if (!verbose_proctitle) return; str_append_c(title, '['); switch (imap_client_count) { case 0: str_append(title, "idling"); break; case 1: client = imap_clients; str_append(title, client->user->username); if (client->user->remote_ip != NULL) { str_append_c(title, ' '); str_append(title, net_ip2addr(client->user->remote_ip)); } for (cmd = client->command_queue; cmd != NULL; cmd = cmd->next) { if (cmd->name == NULL) continue; if (str_len(title) > IMAP_PROCTITLE_PREFERRED_LEN) break; str_append_c(title, ' '); str_append(title, cmd->name); } break; default: str_printfa(title, "%u connections", imap_client_count); break; } str_append_c(title, ']'); process_title_set(str_c(title)); } static void client_kill_idle(struct client *client) { if (client->output_lock != NULL) return; client_send_line(client, "* BYE Server shutting down."); client_destroy(client, "Server shutting down."); } static void imap_die(void) { struct client *client, *next; time_t last_io, now = time(NULL); time_t stop_timestamp = now - IMAP_DIE_IDLE_SECS; unsigned int stop_msecs; for (client = imap_clients; client != NULL; client = next) { next = client->next; last_io = I_MAX(client->last_input, client->last_output); if (last_io <= stop_timestamp) client_kill_idle(client); else { timeout_remove(&client->to_idle); stop_msecs = (last_io - stop_timestamp) * 1000; client->to_idle = timeout_add(stop_msecs, client_kill_idle, client); } } } struct client_input { const char *tag; const unsigned char *input; unsigned int input_size; bool send_untagged_capability; }; static void client_parse_input(const unsigned char *data, unsigned int len, struct client_input *input_r) { unsigned int taglen; i_assert(len > 0); memset(input_r, 0, sizeof(*input_r)); if (data[0] == '1') input_r->send_untagged_capability = TRUE; data++; len--; input_r->tag = t_strndup(data, len); taglen = strlen(input_r->tag) + 1; if (len > taglen) { input_r->input = data + taglen; input_r->input_size = len - taglen; } } static void client_add_input(struct client *client, const buffer_t *buf) { struct ostream *output; struct client_input input; if (buf != NULL && buf->used > 0) { client_parse_input(buf->data, buf->used, &input); if (input.input_size > 0 && !i_stream_add_data(client->input, input.input, input.input_size)) i_panic("Couldn't add client input to stream"); } else { /* IMAPLOGINTAG environment is compatible with mailfront */ memset(&input, 0, sizeof(input)); input.tag = getenv("IMAPLOGINTAG"); } output = client->output; o_stream_ref(output); o_stream_cork(output); if (input.tag == NULL) { client_send_line(client, t_strconcat( "* PREAUTH [CAPABILITY ", str_c(client->capability_string), "] " "Logged in as ", client->user->username, NULL)); } else if (input.send_untagged_capability) { /* client doesn't seem to understand tagged capabilities. send untagged instead and hope that it works. */ client_send_line(client, t_strconcat("* CAPABILITY ", str_c(client->capability_string), NULL)); client_send_line(client, t_strconcat(input.tag, " OK Logged in", NULL)); } else { client_send_line(client, t_strconcat( input.tag, " OK [CAPABILITY ", str_c(client->capability_string), "] Logged in", NULL)); } (void)client_handle_input(client); o_stream_uncork(output); o_stream_unref(&output); } static int client_create_from_input(const struct mail_storage_service_input *input, const struct master_login_client *login_client, int fd_in, int fd_out, const buffer_t *input_buf, const char **error_r) { struct mail_storage_service_user *user; struct mail_user *mail_user; struct client *client; const struct imap_settings *set; enum mail_auth_request_flags flags; if (mail_storage_service_lookup_next(storage_service, input, &user, &mail_user, error_r) <= 0) return -1; restrict_access_allow_coredumps(TRUE); set = mail_storage_service_user_get_set(user)[1]; if (set->verbose_proctitle) verbose_proctitle = TRUE; client = client_create(fd_in, fd_out, input->session_id, mail_user, user, set); T_BEGIN { client_add_input(client, input_buf); } T_END; flags = login_client->auth_req.flags; if ((flags & MAIL_AUTH_REQUEST_FLAG_TLS_COMPRESSION) != 0) client->tls_compression = TRUE; return 0; } static void main_stdio_run(const char *username) { struct master_login_client login_client; struct mail_storage_service_input input; const char *value, *error, *input_base64; buffer_t *input_buf; memset(&input, 0, sizeof(input)); input.module = input.service = "imap"; input.username = username != NULL ? username : getenv("USER"); if (input.username == NULL && IS_STANDALONE()) input.username = getlogin(); if (input.username == NULL) i_fatal("USER environment missing"); if ((value = getenv("IP")) != NULL) (void)net_addr2ip(value, &input.remote_ip); if ((value = getenv("LOCAL_IP")) != NULL) (void)net_addr2ip(value, &input.local_ip); input_base64 = getenv("CLIENT_INPUT"); input_buf = input_base64 == NULL ? NULL : t_base64_decode_str(input_base64); memset(&login_client, 0, sizeof(login_client)); if (client_create_from_input(&input, &login_client, STDIN_FILENO, STDOUT_FILENO, input_buf, &error) < 0) i_fatal("%s", error); } static void login_client_connected(const struct master_login_client *client, const char *username, const char *const *extra_fields) { #define MSG_BYE_INTERNAL_ERROR "* BYE "MAIL_ERRSTR_CRITICAL_MSG"\r\n" struct mail_storage_service_input input; const char *error; buffer_t input_buf; memset(&input, 0, sizeof(input)); input.module = input.service = "imap"; input.local_ip = client->auth_req.local_ip; input.remote_ip = client->auth_req.remote_ip; input.username = username; input.userdb_fields = extra_fields; input.session_id = client->session_id; buffer_create_const_data(&input_buf, client->data, client->auth_req.data_size); if (client_create_from_input(&input, client, client->fd, client->fd, &input_buf, &error) < 0) { if (write(client->fd, MSG_BYE_INTERNAL_ERROR, strlen(MSG_BYE_INTERNAL_ERROR)) < 0) { if (errno != EAGAIN && errno != EPIPE) i_error("write(client) failed: %m"); } i_error("%s", error); (void)close(client->fd); master_service_client_connection_destroyed(master_service); } } static void login_client_failed(const struct master_login_client *client, const char *errormsg) { struct client_input input; const char *msg; client_parse_input(client->data, client->auth_req.data_size, &input); msg = t_strdup_printf("%s NO ["IMAP_RESP_CODE_UNAVAILABLE"] %s\r\n", input.tag, errormsg); if (write(client->fd, msg, strlen(msg)) < 0) { /* ignored */ } } static void client_connected(struct master_service_connection *conn) { /* when running standalone, we shouldn't even get here */ i_assert(master_login != NULL); master_service_client_connection_accept(conn); master_login_add(master_login, conn->fd); } int main(int argc, char *argv[]) { static const struct setting_parser_info *set_roots[] = { &imap_setting_parser_info, NULL }; struct master_login_settings login_set; enum master_service_flags service_flags = 0; enum mail_storage_service_flags storage_service_flags = 0; const char *username = NULL; int c; memset(&login_set, 0, sizeof(login_set)); login_set.postlogin_timeout_secs = MASTER_POSTLOGIN_TIMEOUT_DEFAULT; if (IS_STANDALONE() && getuid() == 0 && net_getpeername(1, NULL, NULL) == 0) { printf("* BAD [ALERT] imap binary must not be started from " "inetd, use imap-login instead.\n"); return 1; } if (IS_STANDALONE()) { service_flags |= MASTER_SERVICE_FLAG_STANDALONE | MASTER_SERVICE_FLAG_STD_CLIENT; } else { service_flags |= MASTER_SERVICE_FLAG_KEEP_CONFIG_OPEN; storage_service_flags |= MAIL_STORAGE_SERVICE_FLAG_DISALLOW_ROOT; } master_service = master_service_init("imap", service_flags, &argc, &argv, "t:u:"); while ((c = master_getopt(master_service)) > 0) { switch (c) { case 't': if (str_to_uint(optarg, &login_set.postlogin_timeout_secs) < 0 || login_set.postlogin_timeout_secs == 0) i_fatal("Invalid -t parameter: %s", optarg); break; case 'u': storage_service_flags |= MAIL_STORAGE_SERVICE_FLAG_USERDB_LOOKUP; username = optarg; break; default: return FATAL_DEFAULT; } } login_set.auth_socket_path = t_abspath("auth-master"); if (argv[optind] != NULL) login_set.postlogin_socket_path = t_abspath(argv[optind]); login_set.callback = login_client_connected; login_set.failure_callback = login_client_failed; master_service_init_finish(master_service); master_service_set_die_callback(master_service, imap_die); /* plugins may want to add commands, so this needs to be called early */ commands_init(); imap_fetch_handlers_init(); storage_service = mail_storage_service_init(master_service, set_roots, storage_service_flags); /* fake that we're running, so we know if client was destroyed while handling its initial input */ io_loop_set_running(current_ioloop); if (IS_STANDALONE()) { T_BEGIN { main_stdio_run(username); } T_END; } else { master_login = master_login_init(master_service, &login_set); io_loop_set_running(current_ioloop); } if (io_loop_is_running(current_ioloop)) master_service_run(master_service, client_connected); clients_destroy_all(); if (master_login != NULL) master_login_deinit(&master_login); mail_storage_service_deinit(&storage_service); imap_fetch_handlers_deinit(); commands_deinit(); master_service_deinit(&master_service); return 0; }