From 6ba9413b55aefe0b03d4af6a2a27a4f222c17a8d Mon Sep 17 00:00:00 2001 From: Mike Smith Date: Fri, 9 Oct 1998 00:31:29 +0000 Subject: [PATCH] Kernel environment access, preloaded module lookup. --- sys/kern/kern_environment.c | 126 +++++++++++++++++++++++++++++++ sys/kern/subr_module.c | 144 ++++++++++++++++++++++++++++++++++++ 2 files changed, 270 insertions(+) create mode 100644 sys/kern/kern_environment.c create mode 100644 sys/kern/subr_module.c diff --git a/sys/kern/kern_environment.c b/sys/kern/kern_environment.c new file mode 100644 index 000000000000..400da455add5 --- /dev/null +++ b/sys/kern/kern_environment.c @@ -0,0 +1,126 @@ +/*- + * Copyright (c) 1998 Michael Smith + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $Id$ + +/* + * The unified bootloader passes us a pointer to a preserved copy of + * bootstrap/kernel environment variables. + * We make these available using sysctl for both in-kernel and + * out-of-kernel consumers. + * + * Note that the current sysctl infrastructure doesn't allow + * dynamic insertion or traversal through handled spaces. Grr. + */ + +#include +#include +#include +#include +#include +#include + +char *kern_envp; + +static char *kernenv_next(char *cp); + +static void +kernenv_init(void* arg) +{ + if (bootinfo.bi_envp != 0) + kern_envp = (char *)bootinfo.bi_envp; +} + +SYSINIT(kernenv, SI_SUB_CONSOLE, SI_ORDER_FIRST, kernenv_init, 0); + +char * +getenv(char *name) +{ + char *cp, *ep; + int len; + + for (cp = kern_envp; cp != NULL; cp = kernenv_next(cp)) { + for (ep = cp; (*ep != '=') && (*ep != 0); ep++) + ; + len = ep - cp; + if (*ep = '=') + ep++; + if (!strncmp(name, cp, len)) + return(ep); + } + return(NULL); +} + + +static int +sysctl_kernenv SYSCTL_HANDLER_ARGS +{ + int *name = (int *)arg1; + u_int namelen = arg2; + char *cp; + int i, error; + + if (kern_envp == NULL) + return(ENOENT); + + name++; + namelen--; + + if (namelen != 1) + return(EINVAL); + + cp = kern_envp; + for (i = 0; i < name[0]; i++) { + cp = kernenv_next(cp); + if (cp == NULL) + break; + } + + if (cp == NULL) + return(ENOENT); + + error = SYSCTL_OUT(req, cp, strlen(cp) + 1); + return (error); +} + +SYSCTL_NODE(_kern, OID_AUTO, environment, CTLFLAG_RD, sysctl_kernenv, "kernel environment space"); + +/* + * Find the next entry after the one which (cp) falls within, return a + * pointer to its start or NULL if there are no more. + */ +static char * +kernenv_next(char *cp) +{ + if (cp != NULL) { + while (*cp != 0) + cp++; + cp++; + if (*cp == 0) + cp = NULL; + } + return(cp); +} + diff --git a/sys/kern/subr_module.c b/sys/kern/subr_module.c new file mode 100644 index 000000000000..91730f56acde --- /dev/null +++ b/sys/kern/subr_module.c @@ -0,0 +1,144 @@ +/*- + * Copyright (c) 1998 Michael Smith + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $Id$ + */ + +#include +#include +#include +#include + +/* + * Preloaded module support + */ + +caddr_t module_metadata; + +/* + * Search for the preloaded module (name) + */ +caddr_t +module_search_by_name(const char *name) +{ + caddr_t curp; + u_int32_t *hdr; + + if (module_metadata != NULL) { + + curp = module_metadata; + for (;;) { + hdr = (u_int32_t *)curp; + if (hdr[0] == 0) + break; + + /* Search for a MODINFO_NAME field */ + if ((hdr[0] == MODINFO_NAME) && + !strcmp(name, curp + sizeof(u_int32_t) * 2)) + return(curp); + + /* skip to next field */ + curp += sizeof(u_int32_t) * 2 + hdr[1]; + } + } + return(NULL); +} + +/* + * Search for the first preloaded module of (type) + */ +caddr_t +module_search_by_type(const char *type) +{ + caddr_t curp, lname; + u_int32_t *hdr; + + if (module_metadata != NULL) { + + curp = module_metadata; + lname = NULL; + for (;;) { + hdr = (u_int32_t *)curp; + if (hdr[0] == 0) + break; + + /* remember the start of each record */ + if (hdr[0] == MODINFO_NAME) + lname = curp; + + /* Search for a MODINFO_TYPE field */ + if ((hdr[0] == MODINFO_TYPE) && + !strcmp(type, curp + sizeof(u_int32_t) * 2)) + return(lname); + + /* skip to next field */ + curp += sizeof(u_int32_t) * 2 + hdr[1]; + } + } + return(NULL); +} + +/* + * Given a preloaded module handle (mod), return a pointer + * to the data for the attribute (inf). + */ +caddr_t +module_search_info(caddr_t mod, int inf) +{ + caddr_t curp; + u_int32_t *hdr; + u_int32_t type = 0; + + curp = mod; + for (;;) { + hdr = (u_int32_t *)curp; + /* end of module data? */ + if (hdr[0] == 0) + break; + /* + * We give up once we've looped back to what we were looking at + * first - this should normally be a MODINFO_NAME field. + */ + if (type == 0) { + type = hdr[0]; + } else { + if (hdr[0] == type) + break; + } + + /* + * Attribute match? Return pointer to data. + * Consumer may safely assume that size value preceeds + * data. + */ + if (hdr[0] == inf) + return(curp + (sizeof(u_int32_t) * 2)); + + /* skip to next field */ + curp += sizeof(u_int32_t) * 2 + hdr[1]; + } + return(NULL); +} +