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https://github.com/sheumann/hush.git
synced 2024-12-31 11:31:19 +00:00
inetd: make some fields smaller, move data out of data/bss sections
function old new delta inetd_main 2125 2160 +35 setup 640 645 +5 initring 48 53 +5 reapchild 169 173 +4 retry 92 93 +1 goaway 113 112 -1 inetd_setproctitle 175 173 -2 chargen_dg 229 227 -2 uid 4 - -4 ....................... Argv 4 - -4 rlim_ofile_cur 8 - -8 config 1610 1602 -8 rlim_ofile 16 - -16 getconfigent 1271 1241 -30 builtins 176 132 -44 ring 128 - -128 allsock 128 - -128 ------------------------------------------------------------------------------ (add/remove: 0/18 grow/shrink: 5/6 up/down: 50/-423) Total: -373 bytes text data bss dec hex filename 774144 1051 10708 785903 bfdef busybox_old 774108 1039 10380 785527 bfc77 busybox_unstripped $ size inetd.o inetd_orig.o text data bss dec hex filename 9027 0 0 9027 2343 inetd.o 9064 12 324 9400 24b8 inetd_orig.o
This commit is contained in:
Denis Vlasenko
parent
2a1d024333
commit
512a545f0d
@ -190,9 +190,6 @@ extern char **environ;
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/* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */
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#define FD_MARGIN 8
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static rlim_t rlim_ofile_cur = OPEN_MAX;
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static struct rlimit rlim_ofile;
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/* Check unsupporting builtin */
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
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@ -209,11 +206,24 @@ static struct rlimit rlim_ofile;
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# define INETD_SETPROCTITLE
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#endif
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typedef struct servtab {
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typedef int8_t socktype_t;
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typedef int8_t family_t;
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struct BUG_too_small {
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char BUG_socktype_t_too_small[(0
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| SOCK_STREAM
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| SOCK_DGRAM
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| SOCK_RDM
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| SOCK_SEQPACKET
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| SOCK_RAW) <= 127 ? 1 : -1];
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char BUG_family_t_too_small[(0
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| AF_INET
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| AF_INET6
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| AF_UNIX) <= 127 ? 1 : -1];
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};
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typedef struct servtab_t {
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char *se_hostaddr; /* host address to listen on */
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char *se_service; /* name of service */
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int se_socktype; /* type of socket to use */
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int se_family; /* address family */
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char *se_proto; /* protocol used */
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#if ENABLE_FEATURE_INETD_RPC
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int se_rpcprog; /* rpc program number */
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@ -224,7 +234,9 @@ typedef struct servtab {
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#define isrpcservice(sep) 0
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#endif
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pid_t se_wait; /* single threaded server */
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short se_checked; /* looked at during merge */
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socktype_t se_socktype; /* type of socket to use */
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family_t se_family; /* address family */
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smallint se_checked; /* looked at during merge */
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char *se_user; /* user name to run as */
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char *se_group; /* group name to run as */
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#ifdef INETD_FEATURE_ENABLED
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@ -250,17 +262,16 @@ typedef struct servtab {
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int se_max; /* max # of instances of this service */
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int se_count; /* number started since se_time */
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struct timeval se_time; /* start of se_count */
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struct servtab *se_next;
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struct servtab_t *se_next;
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} servtab_t;
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static servtab_t *servtab;
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#ifdef INETD_FEATURE_ENABLED
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struct builtin {
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const char *bi_service; /* internally provided service name */
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int bi_socktype; /* type of socket supported */
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short bi_fork; /* 1 if should fork before call */
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short bi_wait; /* 1 if should wait for child */
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socktype_t bi_socktype; /* type of socket supported */
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uint8_t bi_fork; /* 1 if should fork before call */
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// Commented since it is always 0
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// uint8_t bi_wait; /* 1 if should wait for child */
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void (*bi_fn) (int, servtab_t *);
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};
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@ -293,45 +304,90 @@ static void chargen_dg(int, servtab_t *);
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static const struct builtin builtins[] = {
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
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/* Echo received data */
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{"echo", SOCK_STREAM, 1, 0, echo_stream,},
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{"echo", SOCK_DGRAM, 0, 0, echo_dg,},
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{"echo", SOCK_STREAM, 1, echo_stream,},
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{"echo", SOCK_DGRAM, 0, echo_dg,},
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#endif
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
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/* Internet /dev/null */
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{"discard", SOCK_STREAM, 1, 0, discard_stream,},
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{"discard", SOCK_DGRAM, 0, 0, discard_dg,},
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{"discard", SOCK_STREAM, 1, discard_stream,},
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{"discard", SOCK_DGRAM, 0, discard_dg,},
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#endif
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
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/* Return 32 bit time since 1900 */
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{"time", SOCK_STREAM, 0, 0, machtime_stream,},
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{"time", SOCK_DGRAM, 0, 0, machtime_dg,},
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{"time", SOCK_STREAM, 0, machtime_stream,},
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{"time", SOCK_DGRAM, 0, machtime_dg,},
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#endif
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
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/* Return human-readable time */
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{"daytime", SOCK_STREAM, 0, 0, daytime_stream,},
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{"daytime", SOCK_DGRAM, 0, 0, daytime_dg,},
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{"daytime", SOCK_STREAM, 0, daytime_stream,},
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{"daytime", SOCK_DGRAM, 0, daytime_dg,},
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#endif
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
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/* Familiar character generator */
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{"chargen", SOCK_STREAM, 1, 0, chargen_stream,},
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{"chargen", SOCK_DGRAM, 0, 0, chargen_dg,},
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{"chargen", SOCK_STREAM, 1, chargen_stream,},
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{"chargen", SOCK_DGRAM, 0, chargen_dg,},
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#endif
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{NULL, 0, 0, 0, NULL}
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{ /* zero filled */ }
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};
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#endif /* INETD_FEATURE_ENABLED */
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static int global_queuelen = 128;
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static int nsock, maxsock;
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static fd_set allsock;
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static int toomany;
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static int timingout;
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static struct servent *sp;
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static uid_t uid;
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static const char *config_filename = "/etc/inetd.conf";
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static FILE *fconfig;
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static char *defhost;
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struct globals {
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rlim_t rlim_ofile_cur;
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struct rlimit rlim_ofile;
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servtab_t *servtab;
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int global_queuelen;
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int nsock;
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int maxsock;
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int toomany;
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int timingout;
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struct servent *sp;
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uid_t uid;
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const char *config_filename;
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FILE *fconfig;
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char *defhost;
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#ifdef INETD_SETPROCTITLE
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char **Argv;
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char *LastArg;
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#endif
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
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char *endring;
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char *ringpos;
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char ring[128];
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#endif
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fd_set allsock;
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/* Used only in nextline() */
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char line[80]; /* at least 80, see LINE_SIZE */
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};
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#define G (*(struct globals*)&bb_common_bufsiz1)
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enum { LINE_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line) };
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struct BUG_G_too_big {
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char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
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};
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#define rlim_ofile_cur (G.rlim_ofile_cur )
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#define rlim_ofile (G.rlim_ofile )
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#define servtab (G.servtab )
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#define global_queuelen (G.global_queuelen)
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#define nsock (G.nsock )
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#define maxsock (G.maxsock )
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#define toomany (G.toomany )
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#define timingout (G.timingout )
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#define sp (G.sp )
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#define uid (G.uid )
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#define config_filename (G.config_filename)
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#define fconfig (G.fconfig )
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#define defhost (G.defhost )
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#define Argv (G.Argv )
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#define LastArg (G.LastArg )
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#define endring (G.endring )
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#define ringpos (G.ringpos )
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#define ring (G.ring )
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#define allsock (G.allsock )
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#define line (G.line )
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#define INIT_G() do { \
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rlim_ofile_cur = OPEN_MAX; \
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global_queuelen = 128; \
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config_filename = "/etc/inetd.conf"; \
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} while (0)
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/* xstrdup(NULL) returns NULL, but this one
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* will return newly-allocated "" if called with NULL arg
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@ -510,12 +566,10 @@ static void setup(servtab_t *sep)
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static char *nextline(void)
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{
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#define line bb_common_bufsiz1
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char *cp;
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FILE *fd = fconfig;
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if (fgets(line, sizeof(line), fd) == NULL)
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if (fgets(line, LINE_SIZE, fd) == NULL)
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return NULL;
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cp = strchr(line, '\n');
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if (cp)
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@ -740,15 +794,15 @@ static servtab_t *getconfigent(void)
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const struct builtin *bi;
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for (bi = builtins; bi->bi_service; bi++)
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if (bi->bi_socktype == sep->se_socktype &&
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strcmp(bi->bi_service, sep->se_service) == 0)
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if (bi->bi_socktype == sep->se_socktype
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&& strcmp(bi->bi_service, sep->se_service) == 0)
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break;
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if (bi->bi_service == 0) {
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bb_error_msg("internal service %s unknown", sep->se_service);
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goto more;
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}
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sep->se_bi = bi;
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sep->se_wait = bi->bi_wait;
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sep->se_wait = 0; /* = bi->bi_wait; - always 0 */
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#else
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bb_perror_msg("internal service %s unknown", sep->se_service);
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goto more;
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@ -792,36 +846,36 @@ static servtab_t *getconfigent(void)
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if (LONE_CHAR(nsep->se_hostaddr, '*'))
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nsep->se_ctrladdr_in.sin_addr.s_addr = INADDR_ANY;
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else if (!inet_aton(nsep->se_hostaddr, &nsep->se_ctrladdr_in.sin_addr)) {
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int i;
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struct hostent *hp;
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hp = gethostbyname(nsep->se_hostaddr);
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if (hp == 0) {
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if (hp == NULL) {
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bb_error_msg("%s: unknown host", nsep->se_hostaddr);
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nsep->se_checked = 0;
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goto skip;
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} else if (hp->h_addrtype != AF_INET) {
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}
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if (hp->h_addrtype != AF_INET) {
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bb_error_msg("%s: address isn't an Internet "
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"address", nsep->se_hostaddr);
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nsep->se_checked = 0;
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goto skip;
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} else {
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int i = 1;
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memmove(&nsep->se_ctrladdr_in.sin_addr,
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hp->h_addr_list[0], sizeof(struct in_addr));
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while (hp->h_addr_list[i] != NULL) {
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psep = dupconfig(nsep);
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psep->se_hostaddr = xxstrdup(nsep->se_hostaddr);
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psep->se_checked = 1;
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memmove(&psep->se_ctrladdr_in.sin_addr,
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hp->h_addr_list[i], sizeof(struct in_addr));
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psep->se_ctrladdr_size = sizeof(psep->se_ctrladdr_in);
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i++;
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/* Prepend to list, don't want to look up */
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/* its hostname again. */
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psep->se_next = sep;
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sep = psep;
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}
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}
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i = 1;
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memmove(&nsep->se_ctrladdr_in.sin_addr,
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hp->h_addr_list[0], sizeof(struct in_addr));
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while (hp->h_addr_list[i] != NULL) {
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psep = dupconfig(nsep);
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psep->se_hostaddr = xxstrdup(nsep->se_hostaddr);
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psep->se_checked = 1;
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memmove(&psep->se_ctrladdr_in.sin_addr,
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hp->h_addr_list[i], sizeof(struct in_addr));
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psep->se_ctrladdr_size = sizeof(psep->se_ctrladdr_in);
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i++;
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/* Prepend to list, don't want to look up */
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/* its hostname again. */
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psep->se_next = sep;
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sep = psep;
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}
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}
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}
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@ -1219,8 +1273,6 @@ static void goaway(int sig ATTRIBUTE_UNUSED)
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#ifdef INETD_SETPROCTITLE
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static char **Argv;
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static char *LastArg;
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static void
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inetd_setproctitle(char *a, int s)
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@ -1262,10 +1314,14 @@ int inetd_main(int argc, char **argv)
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char buf[50];
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char *stoomany;
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sigset_t omask, wait_mask;
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#ifdef INETD_SETPROCTITLE
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char **envp;
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#endif
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INIT_G();
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#ifdef INETD_SETPROCTITLE
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char **envp = environ;
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envp = environ;
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Argv = argv;
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if (envp == 0 || *envp == 0)
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envp = argv;
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@ -1600,8 +1656,6 @@ discard_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
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#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
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#define LINESIZ 72
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static char ring[128];
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static char *endring;
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static void
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initring(void)
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@ -1609,7 +1663,6 @@ initring(void)
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int i;
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endring = ring;
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for (i = 0; i <= 128; ++i)
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if (isprint(i))
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*endring++ = i;
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@ -1657,14 +1710,13 @@ chargen_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
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{
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/* struct sockaddr_storage ss; */
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struct sockaddr sa;
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static char *rs;
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int len;
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char text[LINESIZ + 2];
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socklen_t size;
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if (endring == 0) {
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if (!endring) {
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initring();
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rs = ring;
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ringpos = ring;
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}
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size = sizeof(sa);
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@ -1673,14 +1725,15 @@ chargen_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
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if (dg_badinput((struct sockaddr_in *) &sa))
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return;
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if ((len = endring - rs) >= LINESIZ)
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memmove(text, rs, LINESIZ);
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len = endring - ringpos;
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if (len >= LINESIZ)
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memmove(text, ringpos, LINESIZ);
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else {
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memmove(text, rs, len);
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memmove(text, ringpos, len);
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memmove(text + len, ring, LINESIZ - len);
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}
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if (++rs == endring)
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rs = ring;
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if (++ringpos == endring)
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ringpos = ring;
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text[LINESIZ] = '\r';
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text[LINESIZ + 1] = '\n';
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(void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa));
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