701 lines
12 KiB
C
701 lines
12 KiB
C
/*
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* BIRD Internet Routing Daemon -- Unix Entry Point
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*
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* (c) 1998--2000 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#undef LOCAL_DEBUG
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#define _GNU_SOURCE 1
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <signal.h>
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#include <pwd.h>
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#include <grp.h>
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#include <sys/stat.h>
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#include <libgen.h>
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#include "nest/bird.h"
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#include "lib/lists.h"
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#include "lib/resource.h"
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#include "lib/socket.h"
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#include "lib/event.h"
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#include "lib/string.h"
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#include "nest/route.h"
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#include "nest/protocol.h"
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#include "nest/iface.h"
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#include "nest/cli.h"
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#include "nest/locks.h"
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#include "conf/conf.h"
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#include "filter/filter.h"
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#include "unix.h"
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#include "krt.h"
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/*
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* Debugging
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*/
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#ifdef DEBUGGING
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static int debug_flag = 1;
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#else
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static int debug_flag = 0;
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#endif
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void
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async_dump(void)
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{
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debug("INTERNAL STATE DUMP\n\n");
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rdump(&root_pool);
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sk_dump_all();
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tm_dump_all();
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if_dump_all();
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neigh_dump_all();
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rta_dump_all();
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rt_dump_all();
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protos_dump_all();
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debug("\n");
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}
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/*
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* Dropping privileges
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*/
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#ifdef CONFIG_RESTRICTED_PRIVILEGES
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#include "lib/syspriv.h"
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#else
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static inline void
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drop_uid(uid_t uid)
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{
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die("Cannot change user on this platform");
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}
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#endif
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static inline void
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drop_gid(gid_t gid)
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{
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if (setgid(gid) < 0)
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die("setgid: %m");
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}
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/*
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* Reading the Configuration
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*/
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#ifdef PATH_IPROUTE_DIR
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static inline void
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add_num_const(char *name, int val)
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{
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struct symbol *s = cf_find_symbol(name);
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s->class = SYM_NUMBER;
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s->def = NULL;
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s->aux = val;
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}
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/* the code of read_iproute_table() is based on
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rtnl_tab_initialize() from iproute2 package */
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static void
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read_iproute_table(char *file, char *prefix, int max)
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{
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char buf[512], namebuf[512];
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char *name;
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int val;
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FILE *fp;
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strcpy(namebuf, prefix);
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name = namebuf + strlen(prefix);
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fp = fopen(file, "r");
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if (!fp)
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return;
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while (fgets(buf, sizeof(buf), fp))
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{
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char *p = buf;
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while (*p == ' ' || *p == '\t')
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p++;
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if (*p == '#' || *p == '\n' || *p == 0)
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continue;
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if (sscanf(p, "0x%x %s\n", &val, name) != 2 &&
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sscanf(p, "0x%x %s #", &val, name) != 2 &&
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sscanf(p, "%d %s\n", &val, name) != 2 &&
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sscanf(p, "%d %s #", &val, name) != 2)
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continue;
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if (val < 0 || val > max)
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continue;
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for(p = name; *p; p++)
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if ((*p < 'a' || *p > 'z') && (*p < '0' || *p > '9') && (*p != '_'))
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*p = '_';
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add_num_const(namebuf, val);
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}
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fclose(fp);
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}
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#endif // PATH_IPROUTE_DIR
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static char *config_name = PATH_CONFIG;
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static int
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cf_read(byte *dest, unsigned int len, int fd)
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{
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int l = read(fd, dest, len);
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if (l < 0)
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cf_error("Read error");
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return l;
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}
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static int
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cf_open(char *filename)
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{
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char full_name[BIRD_FNAME_MAX];
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char *cur = filename;
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int ret;
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if (*filename != '/') {
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char dir[BIRD_FNAME_MAX];
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strncpy(dir, config_name, sizeof(dir));
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dir[sizeof(dir)-1] = 0;
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snprintf(full_name, sizeof(full_name), "%s/%s", dirname(dir), filename);
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full_name[sizeof(full_name)-1] = 0;
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cur = full_name;
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}
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if ((ret = open(cur, O_RDONLY)) == -1)
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cf_error("Unable to open included configuration file: %s", cur);
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return ret;
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}
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void
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sysdep_preconfig(struct config *c)
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{
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init_list(&c->logfiles);
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#ifdef PATH_IPROUTE_DIR
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read_iproute_table(PATH_IPROUTE_DIR "/rt_protos", "ipp_", 256);
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read_iproute_table(PATH_IPROUTE_DIR "/rt_realms", "ipr_", 256);
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read_iproute_table(PATH_IPROUTE_DIR "/rt_scopes", "ips_", 256);
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read_iproute_table(PATH_IPROUTE_DIR "/rt_tables", "ipt_", 256);
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#endif
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}
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int
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sysdep_commit(struct config *new, struct config *old UNUSED)
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{
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log_switch(debug_flag, &new->logfiles, new->syslog_name);
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return 0;
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}
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static int
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unix_read_config(struct config **cp, char *name)
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{
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struct config *conf = config_alloc(name);
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int ret;
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*cp = conf;
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conf->file_fd = open(name, O_RDONLY);
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if (conf->file_fd < 0)
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return 0;
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cf_read_hook = cf_read;
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cf_open_hook = cf_open;
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ret = config_parse(conf);
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close(conf->file_fd);
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return ret;
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}
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static void
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read_config(void)
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{
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struct config *conf;
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if (!unix_read_config(&conf, config_name))
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{
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if (conf->err_msg)
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die("%s, line %d: %s", conf->err_file_name, conf->err_lino, conf->err_msg);
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else
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die("Unable to open configuration file %s: %m", config_name);
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}
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config_commit(conf, RECONFIG_HARD);
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}
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void
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async_config(void)
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{
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struct config *conf;
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log(L_INFO "Reconfiguration requested by SIGHUP");
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if (!unix_read_config(&conf, config_name))
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{
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if (conf->err_msg)
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log(L_ERR "%s, line %d: %s", conf->err_file_name, conf->err_lino, conf->err_msg);
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else
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log(L_ERR "Unable to open configuration file %s: %m", config_name);
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config_free(conf);
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}
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else
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config_commit(conf, RECONFIG_HARD);
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}
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void
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cmd_reconfig(char *name, int type)
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{
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struct config *conf;
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if (cli_access_restricted())
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return;
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if (!name)
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name = config_name;
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cli_msg(-2, "Reading configuration from %s", name);
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if (!unix_read_config(&conf, name))
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{
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if (conf->err_msg)
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cli_msg(8002, "%s, line %d: %s", name, conf->err_lino, conf->err_msg);
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else
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cli_msg(8002, "%s: %m", name);
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config_free(conf);
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}
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else
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{
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switch (config_commit(conf, type))
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{
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case CONF_DONE:
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cli_msg(3, "Reconfigured.");
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break;
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case CONF_PROGRESS:
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cli_msg(4, "Reconfiguration in progress.");
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break;
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case CONF_SHUTDOWN:
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cli_msg(6, "Reconfiguration ignored, shutting down.");
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break;
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default:
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cli_msg(5, "Reconfiguration already in progress, queueing new config");
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}
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}
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}
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/*
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* Command-Line Interface
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*/
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static sock *cli_sk;
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static char *path_control_socket = PATH_CONTROL_SOCKET;
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static void
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cli_write(cli *c)
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{
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sock *s = c->priv;
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while (c->tx_pos)
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{
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struct cli_out *o = c->tx_pos;
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int len = o->wpos - o->outpos;
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s->tbuf = o->outpos;
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o->outpos = o->wpos;
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if (sk_send(s, len) <= 0)
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return;
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c->tx_pos = o->next;
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}
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/* Everything is written */
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s->tbuf = NULL;
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cli_written(c);
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}
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void
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cli_write_trigger(cli *c)
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{
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sock *s = c->priv;
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if (s->tbuf == NULL)
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cli_write(c);
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}
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static void
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cli_tx(sock *s)
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{
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cli_write(s->data);
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}
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int
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cli_get_command(cli *c)
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{
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sock *s = c->priv;
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byte *t = c->rx_aux ? : s->rbuf;
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byte *tend = s->rpos;
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byte *d = c->rx_pos;
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byte *dend = c->rx_buf + CLI_RX_BUF_SIZE - 2;
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while (t < tend)
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{
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if (*t == '\r')
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t++;
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else if (*t == '\n')
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{
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t++;
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c->rx_pos = c->rx_buf;
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c->rx_aux = t;
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*d = 0;
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return (d < dend) ? 1 : -1;
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}
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else if (d < dend)
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*d++ = *t++;
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}
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c->rx_aux = s->rpos = s->rbuf;
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c->rx_pos = d;
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return 0;
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}
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static int
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cli_rx(sock *s, int size UNUSED)
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{
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cli_kick(s->data);
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return 0;
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}
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static void
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cli_err(sock *s, int err)
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{
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if (config->cli_debug)
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{
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if (err)
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log(L_INFO "CLI connection dropped: %s", strerror(err));
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else
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log(L_INFO "CLI connection closed");
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}
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cli_free(s->data);
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}
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static int
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cli_connect(sock *s, int size UNUSED)
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{
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cli *c;
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if (config->cli_debug)
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log(L_INFO "CLI connect");
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s->rx_hook = cli_rx;
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s->tx_hook = cli_tx;
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s->err_hook = cli_err;
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s->data = c = cli_new(s);
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s->pool = c->pool; /* We need to have all the socket buffers allocated in the cli pool */
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c->rx_pos = c->rx_buf;
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c->rx_aux = NULL;
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rmove(s, c->pool);
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return 1;
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}
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static void
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cli_init_unix(uid_t use_uid, gid_t use_gid)
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{
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sock *s;
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cli_init();
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s = cli_sk = sk_new(cli_pool);
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s->type = SK_UNIX_PASSIVE;
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s->rx_hook = cli_connect;
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s->rbsize = 1024;
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sk_open_unix(s, path_control_socket);
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if (use_uid || use_gid)
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if (chown(path_control_socket, use_uid, use_gid) < 0)
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die("chown: %m");
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if (chmod(path_control_socket, 0660) < 0)
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die("chmod: %m");
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}
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/*
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* Shutdown
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*/
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void
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cmd_shutdown(void)
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{
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if (cli_access_restricted())
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return;
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cli_msg(7, "Shutdown requested");
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order_shutdown();
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}
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void
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async_shutdown(void)
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{
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DBG("Shutting down...\n");
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order_shutdown();
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}
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void
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sysdep_shutdown_done(void)
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{
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unlink(path_control_socket);
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log_msg(L_FATAL "Shutdown completed");
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exit(0);
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}
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/*
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* Signals
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*/
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static void
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handle_sighup(int sig UNUSED)
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{
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DBG("Caught SIGHUP...\n");
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async_config_flag = 1;
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}
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static void
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handle_sigusr(int sig UNUSED)
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{
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DBG("Caught SIGUSR...\n");
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async_dump_flag = 1;
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}
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static void
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handle_sigterm(int sig UNUSED)
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{
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DBG("Caught SIGTERM...\n");
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async_shutdown_flag = 1;
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}
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static void
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signal_init(void)
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{
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struct sigaction sa;
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bzero(&sa, sizeof(sa));
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sa.sa_handler = handle_sigusr;
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sa.sa_flags = SA_RESTART;
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sigaction(SIGUSR1, &sa, NULL);
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sa.sa_handler = handle_sighup;
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sa.sa_flags = SA_RESTART;
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sigaction(SIGHUP, &sa, NULL);
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sa.sa_handler = handle_sigterm;
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sa.sa_flags = SA_RESTART;
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sigaction(SIGTERM, &sa, NULL);
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signal(SIGPIPE, SIG_IGN);
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}
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/*
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* Parsing of command-line arguments
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*/
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static char *opt_list = "c:dD:ps:u:g:";
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static int parse_and_exit;
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char *bird_name;
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static char *use_user;
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static char *use_group;
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static void
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usage(void)
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{
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fprintf(stderr, "Usage: %s [-c <config-file>] [-d] [-D <debug-file>] [-p] [-s <control-socket>] [-u <user>] [-g <group>]\n", bird_name);
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exit(1);
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}
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static inline char *
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get_bird_name(char *s, char *def)
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{
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char *t;
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if (!s)
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return def;
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t = strrchr(s, '/');
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if (!t)
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return s;
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if (!t[1])
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return def;
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return t+1;
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}
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static inline uid_t
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get_uid(const char *s)
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{
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struct passwd *pw;
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char *endptr;
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long int rv;
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if (!s)
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return 0;
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errno = 0;
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rv = strtol(s, &endptr, 10);
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if (!errno && !*endptr)
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return rv;
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pw = getpwnam(s);
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if (!pw)
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die("Cannot find user '%s'", s);
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return pw->pw_uid;
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}
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static inline gid_t
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get_gid(const char *s)
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{
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struct group *gr;
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char *endptr;
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long int rv;
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if (!s)
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return 0;
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errno = 0;
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rv = strtol(s, &endptr, 10);
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if (!errno && !*endptr)
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return rv;
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gr = getgrnam(s);
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if (!gr)
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die("Cannot find group '%s'", s);
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return gr->gr_gid;
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}
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static void
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parse_args(int argc, char **argv)
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{
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int c;
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bird_name = get_bird_name(argv[0], "bird");
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if (argc == 2)
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{
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if (!strcmp(argv[1], "--version"))
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{
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fprintf(stderr, "BIRD version " BIRD_VERSION "\n");
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exit(0);
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}
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if (!strcmp(argv[1], "--help"))
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usage();
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}
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while ((c = getopt(argc, argv, opt_list)) >= 0)
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switch (c)
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{
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case 'c':
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config_name = optarg;
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break;
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case 'd':
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debug_flag |= 1;
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break;
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case 'D':
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log_init_debug(optarg);
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debug_flag |= 2;
|
|
break;
|
|
case 'p':
|
|
parse_and_exit = 1;
|
|
break;
|
|
case 's':
|
|
path_control_socket = optarg;
|
|
break;
|
|
case 'u':
|
|
use_user = optarg;
|
|
break;
|
|
case 'g':
|
|
use_group = optarg;
|
|
break;
|
|
default:
|
|
usage();
|
|
}
|
|
if (optind < argc)
|
|
usage();
|
|
}
|
|
|
|
/*
|
|
* Hic Est main()
|
|
*/
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
#ifdef HAVE_LIBDMALLOC
|
|
if (!getenv("DMALLOC_OPTIONS"))
|
|
dmalloc_debug(0x2f03d00);
|
|
#endif
|
|
|
|
parse_args(argc, argv);
|
|
if (debug_flag == 1)
|
|
log_init_debug("");
|
|
log_switch(debug_flag, NULL, NULL);
|
|
|
|
resource_init();
|
|
olock_init();
|
|
io_init();
|
|
rt_init();
|
|
if_init();
|
|
roa_init();
|
|
|
|
uid_t use_uid = get_uid(use_user);
|
|
gid_t use_gid = get_gid(use_group);
|
|
|
|
if (!parse_and_exit)
|
|
{
|
|
test_old_bird(path_control_socket);
|
|
cli_init_unix(use_uid, use_gid);
|
|
}
|
|
|
|
if (use_gid)
|
|
drop_gid(use_gid);
|
|
|
|
if (use_uid)
|
|
drop_uid(use_uid);
|
|
|
|
protos_build();
|
|
proto_build(&proto_unix_kernel);
|
|
proto_build(&proto_unix_iface);
|
|
|
|
read_config();
|
|
|
|
if (parse_and_exit)
|
|
exit(0);
|
|
|
|
if (!debug_flag)
|
|
{
|
|
pid_t pid = fork();
|
|
if (pid < 0)
|
|
die("fork: %m");
|
|
if (pid)
|
|
return 0;
|
|
setsid();
|
|
close(0);
|
|
if (open("/dev/null", O_RDWR) < 0)
|
|
die("Cannot open /dev/null: %m");
|
|
dup2(0, 1);
|
|
dup2(0, 2);
|
|
}
|
|
|
|
signal_init();
|
|
|
|
#ifdef LOCAL_DEBUG
|
|
async_dump_flag = 1;
|
|
#endif
|
|
|
|
log(L_INFO "Started");
|
|
DBG("Entering I/O loop.\n");
|
|
|
|
io_loop();
|
|
bug("I/O loop died");
|
|
}
|