X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=command.c;h=7dba2f90b8e4ff1e6fca0352d31b79d24b41e9af;hp=21131248c29cd894c8bb74cb13801cd54205e066;hb=08a1de75a3a83c728d97a3c4ff182553adbda8cc;hpb=10756ea9adc1b757ef1ccf2149bda9771923637c diff --git a/command.c b/command.c index 21131248..7dba2f90 100644 --- a/command.c +++ b/command.c @@ -1,38 +1,38 @@ /* * Copyright (C) 1997-2007 Andre Noll * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. + * Licensed under the GPL v2. For licencing details see COPYING. */ /** \file command.c does client authentication and executes server commands */ -#include /* gettimeofday */ +#include +#include +#include +#include +#include + +#include "para.h" +#include "error.h" #include "server.cmdline.h" -#include "db.h" +#include "afs_common.h" +#include "string.h" +#include "afh.h" +#include "afs.h" #include "server.h" #include "vss.h" #include "send.h" #include "rc4.h" -#include -#include "error.h" #include "net.h" #include "daemon.h" -#include "string.h" #include "fd.h" +#include "list.h" #include "user_list.h" #include "server_command_list.h" +#include "afs_command_list.h" + +/** commands including options must be shorter than this */ +#define MAX_COMMAND_LEN 32768 static RC4_KEY rc4_recv_key; static RC4_KEY rc4_send_key; @@ -40,9 +40,7 @@ static unsigned char rc4_buf[2 * RC4_KEY_LEN]; extern const char *status_item_list[NUM_STAT_ITEMS]; extern struct misc_meta_data *mmd; -extern struct audio_file_selector selectors[]; extern struct sender senders[]; -extern char *user_list; static void dummy(__a_unused int s) {} @@ -75,8 +73,8 @@ static char *cmd_perms_itohuman(unsigned int perms) { char *msg = para_malloc(5 * sizeof(char)); - msg[0] = perms & DB_READ? 'a' : '-'; - msg[1] = perms & DB_WRITE? 'A' : '-'; + msg[0] = perms & AFS_READ? 'a' : '-'; + msg[1] = perms & AFS_WRITE? 'A' : '-'; msg[2] = perms & VSS_READ? 'v' : '-'; msg[3] = perms & VSS_WRITE? 'V' : '-'; msg[4] = '\0'; @@ -111,14 +109,14 @@ static char *get_sb_string(struct misc_meta_data *nmmd) return para_strdup(""); if (!base[0]) return base; - if (nmmd->chunks_total) { - secs = (long long) nmmd->seconds_total * nmmd->chunks_sent - / nmmd->chunks_total; - rsecs = (long long) nmmd->seconds_total * - (nmmd->chunks_total - nmmd->chunks_sent) - / nmmd->chunks_total; + if (nmmd->afi.chunks_total) { + secs = (long long) nmmd->afi.seconds_total * nmmd->chunks_sent + / nmmd->afi.chunks_total; + rsecs = (long long) nmmd->afi.seconds_total * + (nmmd->afi.chunks_total - nmmd->chunks_sent) + / nmmd->afi.chunks_total; percent = 100 * ((nmmd->chunks_sent + 5) / 10) - / ((nmmd->chunks_total + 5) / 10); + / ((nmmd->afi.chunks_total + 5) / 10); } ret = make_message("%llu:%02llu [%llu:%02llu] (%llu%%) %s", secs / 60, secs % 60, @@ -149,24 +147,23 @@ static char *get_status(struct misc_meta_data *nmmd) bar = para_basename(nmmd->filename); gettimeofday(&now, NULL); ret = make_message( - "%s:%lu\n" "%s:%s\n" "%s:%i\n" "%s:%u\n" + "%s:%zu\n" "%s:%s\n" "%s:%lu\n" "%s:%u\n" "%s:%s\n" "%s:%s\n" "%s:%s\n" "%s:%s\n" - "%s:%li\n" "%s:%s\n" "%s" "%s" + "%s:%li\n" "%s:%s\n" "%s" "%s:%s\n" "%s:%lu.%lu\n" "%s:%lu.%lu\n", status_item_list[SI_FILE_SIZE], nmmd->size / 1024, status_item_list[SI_MTIME], mtime, - status_item_list[SI_LENGTH], nmmd->seconds_total, + status_item_list[SI_LENGTH], nmmd->afi.seconds_total, status_item_list[SI_NUM_PLAYED], nmmd->num_played, status_item_list[SI_STATUS_BAR], bar ? bar : "(none)", status_item_list[SI_STATUS], status, status_item_list[SI_STATUS_FLAGS], flags, - status_item_list[SI_SELECTOR], selectors[nmmd->selector_num].name, + status_item_list[SI_SELECTOR], "FIXME", status_item_list[SI_OFFSET], offset, status_item_list[SI_FORMAT], audio_format_name(nmmd->audio_format), - nmmd->selector_info, - nmmd->audio_file_info, + nmmd->afi.info_string, status_item_list[SI_UPTIME], ut, status_item_list[SI_STREAM_START], @@ -184,7 +181,7 @@ static char *get_status(struct misc_meta_data *nmmd) return ret; } -static int check_sender_args(int argc, char **argv, struct sender_command_data *scd) +static int check_sender_args(int argc, char * const * argv, struct sender_command_data *scd) { int i; /* this has to match sender.h */ @@ -222,7 +219,7 @@ static int check_sender_args(int argc, char **argv, struct sender_command_data * case SENDER_ALLOW: if (argc != 4 && argc != 5) return -E_COMMAND_SYNTAX; - if (!inet_aton(argv[3], &scd->addr)) + if (!inet_pton(AF_INET, argv[3], &scd->addr)) return -E_COMMAND_SYNTAX; scd->netmask = 32; if (argc == 5) { @@ -235,7 +232,7 @@ static int check_sender_args(int argc, char **argv, struct sender_command_data * case SENDER_DELETE: if (argc != 4 && argc != 5) return -E_COMMAND_SYNTAX; - if (!inet_aton(argv[3], &scd->addr)) + if (!inet_pton(AF_INET, argv[3], &scd->addr)) return -E_COMMAND_SYNTAX; scd->port = -1; if (argc == 5) { @@ -250,7 +247,7 @@ static int check_sender_args(int argc, char **argv, struct sender_command_data * return 1; } -int com_sender(int fd, int argc, char **argv) +int com_sender(int fd, int argc, char * const * argv) { int i, ret; struct sender_command_data scd; @@ -292,19 +289,15 @@ int com_sender(int fd, int argc, char **argv) } /* server info */ -int com_si(int fd, int argc, __a_unused char **argv) +int com_si(int fd, int argc, __a_unused char * const * argv) { int i, ret; char *ut; - char *selector_string = NULL, *sender_info = NULL, *sender_list = NULL; + char *sender_info = NULL, *sender_list = NULL; if (argc != 1) return -E_COMMAND_SYNTAX; mmd_lock(); - for (i = 0; selectors[i].name; i++) { - selector_string = para_strcat(selector_string, selectors[i].name); - selector_string = para_strcat(selector_string, " "); - } for (i = 0; senders[i].name; i++) { char *info = senders[i].info(); sender_info = para_strcat(sender_info, info); @@ -317,7 +310,6 @@ int com_si(int fd, int argc, __a_unused char **argv) "pid: %d\n" "connections (active/accepted/total): %u/%u/%u\n" "current loglevel: %i\n" - "supported audio file selectors: %s\n" "supported audio formats: %s\n" "supported senders: %s\n" "%s", @@ -327,34 +319,30 @@ int com_si(int fd, int argc, __a_unused char **argv) mmd->num_commands, mmd->num_connects, conf.loglevel_arg, - selector_string, supported_audio_formats(), sender_list, sender_info ); mmd_unlock(); free(ut); - free(selector_string); free(sender_list); free(sender_info); return ret; } /* version */ -int com_version(int socket_fd, int argc, __a_unused char **argv) +int com_version(int fd, int argc, __a_unused char * const * argv) { if (argc != 1) return -E_COMMAND_SYNTAX; - return send_buffer(socket_fd, "para_server-" PACKAGE_VERSION ", \"" - CODENAME "\"\n" - COPYRIGHT "\n" - "built: " BUILD_DATE "\n" - SYSTEM ", " CC_VERSION "\n" - ); + return send_buffer(fd, VERSION_TEXT("server") + "built: " BUILD_DATE "\n" + SYSTEM ", " CC_VERSION "\n" + ); } /* sc */ -int com_sc(int socket_fd, int argc, char **argv) +int com_sc(int fd, int argc, char * const * argv) { char *name = NULL; int ret, old = 0, count = -1; /* print af change forever */ @@ -369,7 +357,7 @@ repeat: } mmd_unlock(); if (name) { - ret = send_va_buffer(socket_fd, "%s\n", name); + ret = send_va_buffer(fd, "%s\n", name); free(name); name = NULL; if (ret < 0) @@ -382,7 +370,7 @@ repeat: } /* sb */ -int com_sb(int socket_fd, int argc, char **argv) +int com_sb(int fd, int argc, char * const * argv) { char *sb; int ret, nr = -1; /* status bar will be printed that many @@ -395,7 +383,7 @@ int com_sb(int socket_fd, int argc, char **argv) mmd_lock(); sb = get_sb_string(mmd); mmd_unlock(); - ret = send_va_buffer(socket_fd, "%s\n", sb); + ret = send_va_buffer(fd, "%s\n", sb); free(sb); if (ret < 0) return ret; @@ -409,7 +397,7 @@ int com_sb(int socket_fd, int argc, char **argv) } /* stat */ -int com_stat(int socket_fd, int argc, char **argv) +int com_stat(int fd, int argc, char * const * argv) { int ret, num = 0;/* status will be printed that many * times. num <= 0 means: print forever @@ -425,7 +413,7 @@ int com_stat(int socket_fd, int argc, char **argv) mmd_dup(nmmd); s = get_status(nmmd); - ret = send_buffer(socket_fd, s); + ret = send_buffer(fd, s); free(s); if (ret < 0) goto out; @@ -459,7 +447,7 @@ static int send_list_of_commands(int fd, struct server_command *cmd, } /* always returns string that must be freed by the caller in handler */ -static struct server_command *get_cmd_ptr(char *name, char **handler) +static struct server_command *get_cmd_ptr(const char *name, char **handler) { struct server_command *cmd; @@ -469,21 +457,15 @@ static struct server_command *get_cmd_ptr(char *name, char **handler) *handler = para_strdup("para_server"); /* server commands */ return cmd; } - /* not found, look for commands supported by the current selector */ - mmd_lock(); - if (handler) - *handler = make_message("the %s selector", - selectors[mmd->selector_num].name); - cmd = selectors[mmd->selector_num].cmd_list; - mmd_unlock(); - for (; cmd->name; cmd++) + /* not found, look for commands supported by afs */ + for (cmd = afs_cmds; cmd->name; cmd++) if (!strcmp(cmd->name, name)) return cmd; return NULL; } /* help */ -int com_help(int fd, int argc, char **argv) +int com_help(int fd, int argc, char * const * argv) { struct server_command *cmd; char *perms, *handler; @@ -493,13 +475,7 @@ int com_help(int fd, int argc, char **argv) /* no argument given, print list of commands */ if ((ret = send_list_of_commands(fd, server_cmds, "server")) < 0) return ret; - mmd_lock(); - handler = para_strdup(selectors[mmd->selector_num].name); - cmd = selectors[mmd->selector_num].cmd_list; - mmd_unlock(); - ret = send_list_of_commands(fd, cmd, handler); - free(handler); - return ret; + return send_list_of_commands(fd, afs_cmds, "afs"); } /* argument given for help */ cmd = get_cmd_ptr(argv[1], &handler); @@ -527,7 +503,7 @@ int com_help(int fd, int argc, char **argv) } /* hup */ -int com_hup(__a_unused int socket_fd, int argc, __a_unused char **argv) +int com_hup(__a_unused int fd, int argc, __a_unused char * const * argv) { if (argc != 1) return -E_COMMAND_SYNTAX; @@ -536,7 +512,7 @@ int com_hup(__a_unused int socket_fd, int argc, __a_unused char **argv) } /* term */ -int com_term(__a_unused int socket_fd, int argc, __a_unused char **argv) +int com_term(__a_unused int fd, int argc, __a_unused char * const * argv) { if (argc != 1) return -E_COMMAND_SYNTAX; @@ -544,7 +520,7 @@ int com_term(__a_unused int socket_fd, int argc, __a_unused char **argv) return 1; } -int com_play(__a_unused int socket_fd, int argc, __a_unused char **argv) +int com_play(__a_unused int fd, int argc, __a_unused char * const * argv) { if (argc != 1) return -E_COMMAND_SYNTAX; @@ -557,7 +533,7 @@ int com_play(__a_unused int socket_fd, int argc, __a_unused char **argv) } /* stop */ -int com_stop(__a_unused int socket_fd, int argc, __a_unused char **argv) +int com_stop(__a_unused int fd, int argc, __a_unused char * const * argv) { if (argc != 1) return -E_COMMAND_SYNTAX; @@ -570,7 +546,7 @@ int com_stop(__a_unused int socket_fd, int argc, __a_unused char **argv) } /* pause */ -int com_pause(__a_unused int socket_fd, int argc, __a_unused char **argv) +int com_pause(__a_unused int fd, int argc, __a_unused char * const * argv) { if (argc != 1) return -E_COMMAND_SYNTAX; @@ -583,33 +559,8 @@ int com_pause(__a_unused int socket_fd, int argc, __a_unused char **argv) return 1; } -int com_chs(int fd, int argc, char **argv) -{ - int i, ret; - - if (argc == 1) { - char *selector; - mmd_lock(); - selector = para_strdup(selectors[mmd->selector_num].name); - mmd_unlock(); - ret = send_va_buffer(fd, "%s\n", selector); - free(selector); - return ret; - } - for (i = 0; selectors[i].name; i++) { - if (strcmp(selectors[i].name, argv[1])) - continue; - mmd_lock(); - mmd->selector_change = i; - mmd->events++; - mmd_unlock(); - return 1; - } - return -E_BAD_SELECTOR; -} - /* next */ -int com_next(__a_unused int socket_fd, int argc, __a_unused char **argv) +int com_next(__a_unused int fd, int argc, __a_unused char * const * argv) { if (argc != 1) return -E_COMMAND_SYNTAX; @@ -621,7 +572,7 @@ int com_next(__a_unused int socket_fd, int argc, __a_unused char **argv) } /* nomore */ -int com_nomore(__a_unused int socket_fd, int argc, __a_unused char **argv) +int com_nomore(__a_unused int fd, int argc, __a_unused char * const * argv) { if (argc != 1) return -E_COMMAND_SYNTAX; @@ -633,7 +584,7 @@ int com_nomore(__a_unused int socket_fd, int argc, __a_unused char **argv) } /* ff */ -int com_ff(__a_unused int socket_fd, int argc, char **argv) +int com_ff(__a_unused int fd, int argc, char * const * argv) { long promille; int ret, backwards = 0; @@ -648,20 +599,20 @@ int com_ff(__a_unused int socket_fd, int argc, char **argv) backwards = 1; /* jmp backwards */ mmd_lock(); ret = -E_NO_AUDIO_FILE; - if (!mmd->chunks_total || !mmd->seconds_total) + if (!mmd->afi.chunks_total || !mmd->afi.seconds_total) goto out; - promille = (1000 * mmd->current_chunk) / mmd->chunks_total; + promille = (1000 * mmd->current_chunk) / mmd->afi.chunks_total; if (backwards) - promille -= 1000 * i / mmd->seconds_total; + promille -= 1000 * i / mmd->afi.seconds_total; else - promille += 1000 * i / mmd->seconds_total; + promille += 1000 * i / mmd->afi.seconds_total; if (promille < 0) promille = 0; if (promille > 1000) { mmd->new_vss_status_flags |= VSS_NEXT; goto out; } - mmd->repos_request = (mmd->chunks_total * promille) / 1000; + mmd->repos_request = (mmd->afi.chunks_total * promille) / 1000; mmd->new_vss_status_flags |= VSS_REPOS; mmd->new_vss_status_flags &= ~VSS_NEXT; mmd->events++; @@ -672,7 +623,7 @@ out: } /* jmp */ -int com_jmp(__a_unused int socket_fd, int argc, char **argv) +int com_jmp(__a_unused int fd, int argc, char * const * argv) { long unsigned int i; int ret; @@ -683,12 +634,12 @@ int com_jmp(__a_unused int socket_fd, int argc, char **argv) return -E_COMMAND_SYNTAX; mmd_lock(); ret = -E_NO_AUDIO_FILE; - if (!mmd->chunks_total) + if (!mmd->afi.chunks_total) goto out; if (i > 100) i = 100; PARA_INFO_LOG("jumping to %lu%%\n", i); - mmd->repos_request = (mmd->chunks_total * i + 50)/ 100; + mmd->repos_request = (mmd->afi.chunks_total * i + 50)/ 100; PARA_INFO_LOG("sent: %lu, offset before jmp: %lu\n", mmd->chunks_sent, mmd->offset); mmd->new_vss_status_flags |= VSS_REPOS; @@ -756,6 +707,42 @@ static void rc4_send(unsigned long len, const unsigned char *indata, RC4(&rc4_send_key, len, indata, outdata); } +static int read_command(int fd, char **result) +{ + int ret; + char buf[4096]; + char *command = NULL; + + for (;;) { + size_t numbytes; + char *p; + + ret = recv_buffer(fd, buf, sizeof(buf)); + if (ret < 0) + goto out; + if (!ret) + break; + numbytes = ret; + ret = -E_COMMAND_SYNTAX; + if (command && numbytes + strlen(command) > MAX_COMMAND_LEN) /* DOS */ + goto out; + command = para_strcat(command, buf); + p = strstr(command, EOC_MSG); + if (p) { + *p = '\0'; + break; + } + } + ret = command? 1 : -E_COMMAND_SYNTAX; +out: + if (ret < 0) + free(command); + else + *result = command; + return ret; + +} + /** * perform user authentication and execute a command * @@ -774,12 +761,10 @@ static void rc4_send(unsigned long len, const unsigned char *indata, * encrypted with its RSA public key. From this point on, * all transfers are crypted with this session key. * - * Next it is checked if the peer supplied a valid server - * command or a command for the audio file selector currently - * in use. If yes, and if the user has sufficient - * permissions to execute that command, the function calls - * the corresponding command handler which does argument - * checking and further processing. + * Next it is checked if the peer supplied a valid server command or a command + * for the audio file selector. If yes, and if the user has sufficient + * permissions to execute that command, the function calls the corresponding + * command handler which does argument checking and further processing. * * In order to cope with a DOS attacks, a timeout is set up * which terminates the function if the connection was not @@ -789,14 +774,15 @@ static void rc4_send(unsigned long len, const unsigned char *indata, */ int handle_connect(int fd, struct sockaddr_in *addr) { - int numbytes, ret, argc, use_rc4 = 0; - char buf[STRINGSIZE]; + int ret, argc, use_rc4 = 0; + char buf[4096]; unsigned char crypt_buf[MAXLINE]; - struct user u; + struct user *u; struct server_command *cmd = NULL; long unsigned challenge_nr, chall_response; char **argv = NULL; char *p, *command = NULL; + size_t numbytes; signal(SIGCHLD, SIG_IGN); signal(SIGINT, SIG_DFL); @@ -824,41 +810,43 @@ int handle_connect(int fd, struct sockaddr_in *addr) goto err_out; if (numbytes < 9 || strncmp(buf, "auth rc4 ", 9)) - u.name = para_strdup(buf + 5); /* client version < 0.2.6 */ + p = buf + 5; /* client version < 0.2.6 */ else { - u.name = para_strdup(buf + 9); /* client version >= 0.2.6 */ + p = buf + 9; /* client version >= 0.2.6 */ use_rc4 = 1; } PARA_DEBUG_LOG("received %s request for user %s\n", - use_rc4? "rc4" : "auth", u.name); - if ((ret = lookup_user(&u)) < 0) + use_rc4? "rc4" : "auth", p); + ret = -E_BAD_USER; + u = lookup_user(p); + if (!u) goto err_out; - ret = para_encrypt_challenge(u.rsa, challenge_nr, crypt_buf); + ret = para_encrypt_challenge(u->rsa, challenge_nr, crypt_buf); if (ret <= 0) goto err_out; numbytes = ret; - PARA_DEBUG_LOG("sending %d byte challenge\n", numbytes); + PARA_DEBUG_LOG("sending %zu byte challenge\n", numbytes); /* We can't use send_buffer here since buf may contain null bytes */ ret = send_bin_buffer(fd,(char *) crypt_buf, numbytes); if (ret < 0) goto err_out; /* recv decrypted number */ - numbytes = recv_buffer(fd, buf, sizeof(buf)); - ret = numbytes; + ret = recv_buffer(fd, buf, sizeof(buf)); if (ret < 0) goto err_out; + numbytes = ret; ret = -E_AUTH; if (!numbytes) goto err_out; if (sscanf(buf, CHALLENGE_RESPONSE_MSG "%lu", &chall_response) < 1 || chall_response != challenge_nr) goto err_out; - /* auth successful. Send 'Proceed' message */ - PARA_INFO_LOG("good auth for %s (%lu)\n", u.name, challenge_nr); + /* auth successful, send 'Proceed' message */ + PARA_INFO_LOG("good auth for %s (%lu)\n", u->name, challenge_nr); sprintf(buf, "%s", PROCEED_MSG); if (use_rc4) { init_rc4_keys(); - ret = para_encrypt_buffer(u.rsa, rc4_buf, 2 * RC4_KEY_LEN, + ret = para_encrypt_buffer(u->rsa, rc4_buf, 2 * RC4_KEY_LEN, (unsigned char *)buf + PROCEED_MSG_LEN + 1); if (ret <= 0) goto err_out; @@ -870,27 +858,15 @@ int handle_connect(int fd, struct sockaddr_in *addr) goto err_out; if (use_rc4) enable_crypt(fd, rc4_recv, rc4_send, NULL); - /* read command */ - while ((numbytes = recv_buffer(fd, buf, sizeof(buf))) > 0) { -// PARA_INFO_LOG("recvd: %s (%d)\n", buf, numbytes); - ret = -E_COMMAND_SYNTAX; - if (command && numbytes + strlen(command) > STRINGSIZE) /* DOS */ - goto err_out; - command = para_strcat(command, buf); - if ((p = strstr(command, EOC_MSG))) { - *p = '\0'; - break; - } - } - ret = numbytes; + ret = read_command(fd, &command); if (ret < 0) goto err_out; ret = -E_BAD_CMD; - /* parse command */ - if (!(cmd = parse_cmd(command))) + cmd = parse_cmd(command); + if (!cmd) goto err_out; /* valid command, check permissions */ - ret = check_perms(u.perms, cmd); + ret = check_perms(u->perms, cmd); if (ret < 0) goto err_out; /* valid command and sufficient perms */ @@ -899,7 +875,7 @@ int handle_connect(int fd, struct sockaddr_in *addr) mmd_lock(); mmd->num_commands++; mmd_unlock(); - PARA_NOTICE_LOG("calling com_%s() for %s@%s\n", cmd->name, u.name, + PARA_NOTICE_LOG("calling com_%s() for %s@%s\n", cmd->name, u->name, inet_ntoa(addr->sin_addr)); ret = cmd->handler(fd, argc, argv); if (ret >= 0) { @@ -907,16 +883,15 @@ int handle_connect(int fd, struct sockaddr_in *addr) goto out; } err_out: - if (ret != -E_SEND && ret != -E_RECV) { - PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-ret)); + PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-ret)); + if (ret != -E_SEND && ret != -E_RECV) send_va_buffer(fd, "%s\n", PARA_STRERROR(-ret)); - } ret = EXIT_FAILURE; out: free(command); free(argv); mmd_lock(); - if (cmd && (cmd->perms & DB_WRITE) && ret >= 0) + if (cmd && (cmd->perms & AFS_WRITE) && ret >= 0) mmd->events++; mmd->active_connections--; mmd_unlock();