/* * Copyright 2010-2011 Calxeda, Inc. * * 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 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, see <http://www.gnu.org/licenses/>. */ #include <common.h> #include <command.h> #include <malloc.h> #include <linux/string.h> #include <linux/ctype.h> #include <errno.h> #include <linux/list.h> #include "menu.h" #define MAX_TFTP_PATH_LEN 127 /* * Like getenv, but prints an error if envvar isn't defined in the * environment. It always returns what getenv does, so it can be used in * place of getenv without changing error handling otherwise. */ static char *from_env(char *envvar) { char *ret; ret = getenv(envvar); if (!ret) printf("missing environment variable: %s\n", envvar); return ret; } /* * Convert an ethaddr from the environment to the format used by pxelinux * filenames based on mac addresses. Convert's ':' to '-', and adds "01-" to * the beginning of the ethernet address to indicate a hardware type of * Ethernet. Also converts uppercase hex characters into lowercase, to match * pxelinux's behavior. * * Returns 1 for success, -ENOENT if 'ethaddr' is undefined in the * environment, or some other value < 0 on error. */ static int format_mac_pxe(char *outbuf, size_t outbuf_len) { size_t ethaddr_len; char *p, *ethaddr; ethaddr = from_env("ethaddr"); if (!ethaddr) return -ENOENT; ethaddr_len = strlen(ethaddr); /* * ethaddr_len + 4 gives room for "01-", ethaddr, and a NUL byte at * the end. */ if (outbuf_len < ethaddr_len + 4) { printf("outbuf is too small (%d < %d)\n", outbuf_len, ethaddr_len + 4); return -EINVAL; } strcpy(outbuf, "01-"); for (p = outbuf + 3; *ethaddr; ethaddr++, p++) { if (*ethaddr == ':') *p = '-'; else *p = tolower(*ethaddr); } *p = '\0'; return 1; } /* * Returns the directory the file specified in the bootfile env variable is * in. If bootfile isn't defined in the environment, return NULL, which should * be interpreted as "don't prepend anything to paths". */ static int get_bootfile_path(const char *file_path, char *bootfile_path, size_t bootfile_path_size) { char *bootfile, *last_slash; size_t path_len = 0; if (file_path[0] == '/') goto ret; bootfile = from_env("bootfile"); if (!bootfile) goto ret; last_slash = strrchr(bootfile, '/'); if (last_slash == NULL) goto ret; path_len = (last_slash - bootfile) + 1; if (bootfile_path_size < path_len) { printf("bootfile_path too small. (%d < %d)\n", bootfile_path_size, path_len); return -1; } strncpy(bootfile_path, bootfile, path_len); ret: bootfile_path[path_len] = '\0'; return 1; } static int (*do_getfile)(char *file_path, char *file_addr); static int do_get_tftp(char *file_path, char *file_addr) { char *tftp_argv[] = {"tftp", NULL, NULL, NULL}; tftp_argv[1] = file_addr; tftp_argv[2] = file_path; if (do_tftpb(NULL, 0, 3, tftp_argv)) return -ENOENT; return 1; } static char *fs_argv[5]; static int do_get_ext2(char *file_path, char *file_addr) { #ifdef CONFIG_CMD_EXT2 fs_argv[0] = "ext2load"; fs_argv[3] = file_addr; fs_argv[4] = file_path; if (!do_ext2load(NULL, 0, 5, fs_argv)) return 1; #endif return -ENOENT; } static int do_get_fat(char *file_path, char *file_addr) { #ifdef CONFIG_CMD_FAT fs_argv[0] = "fatload"; fs_argv[3] = file_addr; fs_argv[4] = file_path; if (!do_fat_fsload(NULL, 0, 5, fs_argv)) return 1; #endif return -ENOENT; } /* * As in pxelinux, paths to files referenced from files we retrieve are * relative to the location of bootfile. get_relfile takes such a path and * joins it with the bootfile path to get the full path to the target file. If * the bootfile path is NULL, we use file_path as is. * * Returns 1 for success, or < 0 on error. */ static int get_relfile(char *file_path, void *file_addr) { size_t path_len; char relfile[MAX_TFTP_PATH_LEN+1]; char addr_buf[10]; int err; err = get_bootfile_path(file_path, relfile, sizeof(relfile)); if (err < 0) return err; path_len = strlen(file_path); path_len += strlen(relfile); if (path_len > MAX_TFTP_PATH_LEN) { printf("Base path too long (%s%s)\n", relfile, file_path); return -ENAMETOOLONG; } strcat(relfile, file_path); printf("Retrieving file: %s\n", relfile); sprintf(addr_buf, "%p", file_addr); return do_getfile(relfile, addr_buf); } /* * Retrieve the file at 'file_path' to the locate given by 'file_addr'. If * 'bootfile' was specified in the environment, the path to bootfile will be * prepended to 'file_path' and the resulting path will be used. * * Returns 1 on success, or < 0 for error. */ static int get_pxe_file(char *file_path, void *file_addr) { unsigned long config_file_size; char *tftp_filesize; int err; err = get_relfile(file_path, file_addr); if (err < 0) return err; /* * the file comes without a NUL byte at the end, so find out its size * and add the NUL byte. */ tftp_filesize = from_env("filesize"); if (!tftp_filesize) return -ENOENT; if (strict_strtoul(tftp_filesize, 16, &config_file_size) < 0) return -EINVAL; *(char *)(file_addr + config_file_size) = '\0'; return 1; } #define PXELINUX_DIR "pxelinux.cfg/" /* * Retrieves a file in the 'pxelinux.cfg' folder. Since this uses get_pxe_file * to do the hard work, the location of the 'pxelinux.cfg' folder is generated * from the bootfile path, as described above. * * Returns 1 on success or < 0 on error. */ static int get_pxelinux_path(char *file, void *pxefile_addr_r) { size_t base_len = strlen(PXELINUX_DIR); char path[MAX_TFTP_PATH_LEN+1]; if (base_len + strlen(file) > MAX_TFTP_PATH_LEN) { printf("path (%s%s) too long, skipping\n", PXELINUX_DIR, file); return -ENAMETOOLONG; } sprintf(path, PXELINUX_DIR "%s", file); return get_pxe_file(path, pxefile_addr_r); } /* * Looks for a pxe file with a name based on the pxeuuid environment variable. * * Returns 1 on success or < 0 on error. */ static int pxe_uuid_path(void *pxefile_addr_r) { char *uuid_str; uuid_str = from_env("pxeuuid"); if (!uuid_str) return -ENOENT; return get_pxelinux_path(uuid_str, pxefile_addr_r); } /* * Looks for a pxe file with a name based on the 'ethaddr' environment * variable. * * Returns 1 on success or < 0 on error. */ static int pxe_mac_path(void *pxefile_addr_r) { char mac_str[21]; int err; err = format_mac_pxe(mac_str, sizeof(mac_str)); if (err < 0) return err; return get_pxelinux_path(mac_str, pxefile_addr_r); } /* * Looks for pxe files with names based on our IP address. See pxelinux * documentation for details on what these file names look like. We match * that exactly. * * Returns 1 on success or < 0 on error. */ static int pxe_ipaddr_paths(void *pxefile_addr_r) { char ip_addr[9]; int mask_pos, err; sprintf(ip_addr, "%08X", ntohl(NetOurIP)); for (mask_pos = 7; mask_pos >= 0; mask_pos--) { err = get_pxelinux_path(ip_addr, pxefile_addr_r); if (err > 0) return err; ip_addr[mask_pos] = '\0'; } return -ENOENT; } /* * Entry point for the 'pxe get' command. * This Follows pxelinux's rules to download a config file from a tftp server. * The file is stored at the location given by the pxefile_addr_r environment * variable, which must be set. * * UUID comes from pxeuuid env variable, if defined * MAC addr comes from ethaddr env variable, if defined * IP * * see http://syslinux.zytor.com/wiki/index.php/PXELINUX * * Returns 0 on success or 1 on error. */ static int do_pxe_get(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { char *pxefile_addr_str; unsigned long pxefile_addr_r; int err; do_getfile = do_get_tftp; if (argc != 1) return CMD_RET_USAGE; pxefile_addr_str = from_env("pxefile_addr_r"); if (!pxefile_addr_str) return 1; err = strict_strtoul(pxefile_addr_str, 16, (unsigned long *)&pxefile_addr_r); if (err < 0) return 1; /* * Keep trying paths until we successfully get a file we're looking * for. */ if (pxe_uuid_path((void *)pxefile_addr_r) > 0 || pxe_mac_path((void *)pxefile_addr_r) > 0 || pxe_ipaddr_paths((void *)pxefile_addr_r) > 0 || get_pxelinux_path("default", (void *)pxefile_addr_r) > 0) { printf("Config file found\n"); return 0; } printf("Config file not found\n"); return 1; } /* * Wrapper to make it easier to store the file at file_path in the location * specified by envaddr_name. file_path will be joined to the bootfile path, * if any is specified. * * Returns 1 on success or < 0 on error. */ static int get_relfile_envaddr(char *file_path, char *envaddr_name) { unsigned long file_addr; char *envaddr; envaddr = from_env(envaddr_name); if (!envaddr) return -ENOENT; if (strict_strtoul(envaddr, 16, &file_addr) < 0) return -EINVAL; return get_relfile(file_path, (void *)file_addr); } /* * A note on the pxe file parser. * * We're parsing files that use syslinux grammar, which has a few quirks. * String literals must be recognized based on context - there is no * quoting or escaping support. There's also nothing to explicitly indicate * when a label section completes. We deal with that by ending a label * section whenever we see a line that doesn't include. * * As with the syslinux family, this same file format could be reused in the * future for non pxe purposes. The only action it takes during parsing that * would throw this off is handling of include files. It assumes we're using * pxe, and does a tftp download of a file listed as an include file in the * middle of the parsing operation. That could be handled by refactoring it to * take a 'include file getter' function. */ /* * Describes a single label given in a pxe file. * * Create these with the 'label_create' function given below. * * name - the name of the menu as given on the 'menu label' line. * kernel - the path to the kernel file to use for this label. * append - kernel command line to use when booting this label * initrd - path to the initrd to use for this label. * attempted - 0 if we haven't tried to boot this label, 1 if we have. * localboot - 1 if this label specified 'localboot', 0 otherwise. * list - lets these form a list, which a pxe_menu struct will hold. */ struct pxe_label { char *name; char *menu; char *kernel; char *append; char *initrd; char *fdt; int attempted; int localboot; struct list_head list; }; /* * Describes a pxe menu as given via pxe files. * * title - the name of the menu as given by a 'menu title' line. * default_label - the name of the default label, if any. * timeout - time in tenths of a second to wait for a user key-press before * booting the default label. * prompt - if 0, don't prompt for a choice unless the timeout period is * interrupted. If 1, always prompt for a choice regardless of * timeout. * labels - a list of labels defined for the menu. */ struct pxe_menu { char *title; char *default_label; int timeout; int prompt; struct list_head labels; }; /* * Allocates memory for and initializes a pxe_label. This uses malloc, so the * result must be free()'d to reclaim the memory. * * Returns NULL if malloc fails. */ static struct pxe_label *label_create(void) { struct pxe_label *label; label = malloc(sizeof(struct pxe_label)); if (!label) return NULL; memset(label, 0, sizeof(struct pxe_label)); return label; } /* * Free the memory used by a pxe_label, including that used by its name, * kernel, append and initrd members, if they're non NULL. * * So - be sure to only use dynamically allocated memory for the members of * the pxe_label struct, unless you want to clean it up first. These are * currently only created by the pxe file parsing code. */ static void label_destroy(struct pxe_label *label) { if (label->name) free(label->name); if (label->kernel) free(label->kernel); if (label->append) free(label->append); if (label->initrd) free(label->initrd); if (label->fdt) free(label->fdt); free(label); } /* * Print a label and its string members if they're defined. * * This is passed as a callback to the menu code for displaying each * menu entry. */ static void label_print(void *data) { struct pxe_label *label = data; const char *c = label->menu ? label->menu : label->kernel; printf("%s:\t%s\n", label->name, c); if (label->kernel) printf("\t\tkernel: %s\n", label->kernel); if (label->append) printf("\t\tappend: %s\n", label->append); if (label->initrd) printf("\t\tinitrd: %s\n", label->initrd); if (label->fdt) printf("\tfdt: %s\n", label->fdt); } /* * Boot a label that specified 'localboot'. This requires that the 'localcmd' * environment variable is defined. Its contents will be executed as U-boot * command. If the label specified an 'append' line, its contents will be * used to overwrite the contents of the 'bootargs' environment variable prior * to running 'localcmd'. * * Returns 1 on success or < 0 on error. */ static int label_localboot(struct pxe_label *label) { char *localcmd; localcmd = from_env("localcmd"); if (!localcmd) return -ENOENT; if (label->append) setenv("bootargs", label->append); debug("running: %s\n", localcmd); return run_command_list(localcmd, strlen(localcmd), 0); } /* * Boot according to the contents of a pxe_label. * * If we can't boot for any reason, we return. A successful boot never * returns. * * The kernel will be stored in the location given by the 'kernel_addr_r' * environment variable. * * If the label specifies an initrd file, it will be stored in the location * given by the 'ramdisk_addr_r' environment variable. * * If the label specifies an 'append' line, its contents will overwrite that * of the 'bootargs' environment variable. */ static void label_boot(struct pxe_label *label) { char *bootm_argv[] = { "bootm", NULL, NULL, NULL, NULL }; int bootm_argc = 3; label_print(label); label->attempted = 1; if (label->localboot) { label_localboot(label); return; } if (label->kernel == NULL) { printf("No kernel given, skipping %s\n", label->name); return; } if (label->initrd) { if (get_relfile_envaddr(label->initrd, "ramdisk_addr_r") < 0) { printf("Skipping %s for failure retrieving initrd\n", label->name); return; } bootm_argv[2] = getenv("ramdisk_addr_r"); } else { bootm_argv[2] = "-"; } if (get_relfile_envaddr(label->kernel, "kernel_addr_r") < 0) { printf("Skipping %s for failure retrieving kernel\n", label->name); return; } if (label->append) setenv("bootargs", label->append); bootm_argv[1] = getenv("kernel_addr_r"); /* * fdt usage is optional: * It handles the following scenarios. All scenarios are exclusive * * Scenario 1: If fdt_addr_r specified and "fdt" label is defined in * pxe file, retrieve fdt blob from server. Pass fdt_addr_r to bootm, * and adjust argc appropriately. * * Scenario 2: If there is an fdt_addr specified, pass it along to * bootm, and adjust argc appropriately. * * Scenario 3: fdt blob is not available. */ bootm_argv[3] = getenv("fdt_addr_r"); /* if fdt label is defined then get fdt from server */ if (bootm_argv[3] && label->fdt) { if (get_relfile_envaddr(label->fdt, "fdt_addr_r") < 0) { printf("Skipping %s for failure retrieving fdt\n", label->name); return; } } else bootm_argv[3] = getenv("fdt_addr"); if (bootm_argv[3]) bootm_argc = 4; do_bootm(NULL, 0, bootm_argc, bootm_argv); } /* * Tokens for the pxe file parser. */ enum token_type { T_EOL, T_STRING, T_EOF, T_MENU, T_TITLE, T_TIMEOUT, T_LABEL, T_KERNEL, T_LINUX, T_APPEND, T_INITRD, T_LOCALBOOT, T_DEFAULT, T_PROMPT, T_INCLUDE, T_FDT, T_INVALID }; /* * A token - given by a value and a type. */ struct token { char *val; enum token_type type; }; /* * Keywords recognized. */ static const struct token keywords[] = { {"menu", T_MENU}, {"title", T_TITLE}, {"timeout", T_TIMEOUT}, {"default", T_DEFAULT}, {"prompt", T_PROMPT}, {"label", T_LABEL}, {"kernel", T_KERNEL}, {"linux", T_LINUX}, {"localboot", T_LOCALBOOT}, {"append", T_APPEND}, {"initrd", T_INITRD}, {"include", T_INCLUDE}, {"fdt", T_FDT}, {NULL, T_INVALID} }; /* * Since pxe(linux) files don't have a token to identify the start of a * literal, we have to keep track of when we're in a state where a literal is * expected vs when we're in a state a keyword is expected. */ enum lex_state { L_NORMAL = 0, L_KEYWORD, L_SLITERAL }; /* * get_string retrieves a string from *p and stores it as a token in * *t. * * get_string used for scanning both string literals and keywords. * * Characters from *p are copied into t-val until a character equal to * delim is found, or a NUL byte is reached. If delim has the special value of * ' ', any whitespace character will be used as a delimiter. * * If lower is unequal to 0, uppercase characters will be converted to * lowercase in the result. This is useful to make keywords case * insensitive. * * The location of *p is updated to point to the first character after the end * of the token - the ending delimiter. * * On success, the new value of t->val is returned. Memory for t->val is * allocated using malloc and must be free()'d to reclaim it. If insufficient * memory is available, NULL is returned. */ static char *get_string(char **p, struct token *t, char delim, int lower) { char *b, *e; size_t len, i; /* * b and e both start at the beginning of the input stream. * * e is incremented until we find the ending delimiter, or a NUL byte * is reached. Then, we take e - b to find the length of the token. */ b = e = *p; while (*e) { if ((delim == ' ' && isspace(*e)) || delim == *e) break; e++; } len = e - b; /* * Allocate memory to hold the string, and copy it in, converting * characters to lowercase if lower is != 0. */ t->val = malloc(len + 1); if (!t->val) return NULL; for (i = 0; i < len; i++, b++) { if (lower) t->val[i] = tolower(*b); else t->val[i] = *b; } t->val[len] = '\0'; /* * Update *p so the caller knows where to continue scanning. */ *p = e; t->type = T_STRING; return t->val; } /* * Populate a keyword token with a type and value. */ static void get_keyword(struct token *t) { int i; for (i = 0; keywords[i].val; i++) { if (!strcmp(t->val, keywords[i].val)) { t->type = keywords[i].type; break; } } } /* * Get the next token. We have to keep track of which state we're in to know * if we're looking to get a string literal or a keyword. * * *p is updated to point at the first character after the current token. */ static void get_token(char **p, struct token *t, enum lex_state state) { char *c = *p; t->type = T_INVALID; /* eat non EOL whitespace */ while (isblank(*c)) c++; /* * eat comments. note that string literals can't begin with #, but * can contain a # after their first character. */ if (*c == '#') { while (*c && *c != '\n') c++; } if (*c == '\n') { t->type = T_EOL; c++; } else if (*c == '\0') { t->type = T_EOF; c++; } else if (state == L_SLITERAL) { get_string(&c, t, '\n', 0); } else if (state == L_KEYWORD) { /* * when we expect a keyword, we first get the next string * token delimited by whitespace, and then check if it * matches a keyword in our keyword list. if it does, it's * converted to a keyword token of the appropriate type, and * if not, it remains a string token. */ get_string(&c, t, ' ', 1); get_keyword(t); } *p = c; } /* * Increment *c until we get to the end of the current line, or EOF. */ static void eol_or_eof(char **c) { while (**c && **c != '\n') (*c)++; } /* * All of these parse_* functions share some common behavior. * * They finish with *c pointing after the token they parse, and return 1 on * success, or < 0 on error. */ /* * Parse a string literal and store a pointer it at *dst. String literals * terminate at the end of the line. */ static int parse_sliteral(char **c, char **dst) { struct token t; char *s = *c; get_token(c, &t, L_SLITERAL); if (t.type != T_STRING) { printf("Expected string literal: %.*s\n", (int)(*c - s), s); return -EINVAL; } *dst = t.val; return 1; } /* * Parse a base 10 (unsigned) integer and store it at *dst. */ static int parse_integer(char **c, int *dst) { struct token t; char *s = *c; unsigned long temp; get_token(c, &t, L_SLITERAL); if (t.type != T_STRING) { printf("Expected string: %.*s\n", (int)(*c - s), s); return -EINVAL; } if (strict_strtoul(t.val, 10, &temp) < 0) { printf("Expected unsigned integer: %s\n", t.val); return -EINVAL; } *dst = (int)temp; free(t.val); return 1; } static int parse_pxefile_top(char *p, struct pxe_menu *cfg, int nest_level); /* * Parse an include statement, and retrieve and parse the file it mentions. * * base should point to a location where it's safe to store the file, and * nest_level should indicate how many nested includes have occurred. For this * include, nest_level has already been incremented and doesn't need to be * incremented here. */ static int handle_include(char **c, char *base, struct pxe_menu *cfg, int nest_level) { char *include_path; char *s = *c; int err; err = parse_sliteral(c, &include_path); if (err < 0) { printf("Expected include path: %.*s\n", (int)(*c - s), s); return err; } err = get_pxe_file(include_path, base); if (err < 0) { printf("Couldn't retrieve %s\n", include_path); return err; } return parse_pxefile_top(base, cfg, nest_level); } /* * Parse lines that begin with 'menu'. * * b and nest are provided to handle the 'menu include' case. * * b should be the address where the file currently being parsed is stored. * * nest_level should be 1 when parsing the top level pxe file, 2 when parsing * a file it includes, 3 when parsing a file included by that file, and so on. */ static int parse_menu(char **c, struct pxe_menu *cfg, char *b, int nest_level) { struct token t; char *s = *c; int err = 0; get_token(c, &t, L_KEYWORD); switch (t.type) { case T_TITLE: err = parse_sliteral(c, &cfg->title); break; case T_INCLUDE: err = handle_include(c, b + strlen(b) + 1, cfg, nest_level + 1); break; default: printf("Ignoring malformed menu command: %.*s\n", (int)(*c - s), s); } if (err < 0) return err; eol_or_eof(c); return 1; } /* * Handles parsing a 'menu line' when we're parsing a label. */ static int parse_label_menu(char **c, struct pxe_menu *cfg, struct pxe_label *label) { struct token t; char *s; s = *c; get_token(c, &t, L_KEYWORD); switch (t.type) { case T_DEFAULT: if (cfg->default_label) free(cfg->default_label); cfg->default_label = strdup(label->name); if (!cfg->default_label) return -ENOMEM; break; case T_LABEL: parse_sliteral(c, &label->menu); break; default: printf("Ignoring malformed menu command: %.*s\n", (int)(*c - s), s); } eol_or_eof(c); return 0; } /* * Parses a label and adds it to the list of labels for a menu. * * A label ends when we either get to the end of a file, or * get some input we otherwise don't have a handler defined * for. * */ static int parse_label(char **c, struct pxe_menu *cfg) { struct token t; int len; char *s = *c; struct pxe_label *label; int err; label = label_create(); if (!label) return -ENOMEM; err = parse_sliteral(c, &label->name); if (err < 0) { printf("Expected label name: %.*s\n", (int)(*c - s), s); label_destroy(label); return -EINVAL; } list_add_tail(&label->list, &cfg->labels); while (1) { s = *c; get_token(c, &t, L_KEYWORD); err = 0; switch (t.type) { case T_MENU: err = parse_label_menu(c, cfg, label); break; case T_KERNEL: case T_LINUX: err = parse_sliteral(c, &label->kernel); break; case T_APPEND: err = parse_sliteral(c, &label->append); if (label->initrd) break; s = strstr(label->append, "initrd="); if (!s) break; s += 7; len = (int)(strchr(s, ' ') - s); label->initrd = malloc(len + 1); strncpy(label->initrd, s, len); label->initrd[len] = '\0'; break; case T_INITRD: if (!label->initrd) err = parse_sliteral(c, &label->initrd); break; case T_FDT: if (!label->fdt) err = parse_sliteral(c, &label->fdt); break; case T_LOCALBOOT: err = parse_integer(c, &label->localboot); break; case T_EOL: break; default: /* * put the token back! we don't want it - it's the end * of a label and whatever token this is, it's * something for the menu level context to handle. */ *c = s; return 1; } if (err < 0) return err; } } /* * This 16 comes from the limit pxelinux imposes on nested includes. * * There is no reason at all we couldn't do more, but some limit helps prevent * infinite (until crash occurs) recursion if a file tries to include itself. */ #define MAX_NEST_LEVEL 16 /* * Entry point for parsing a menu file. nest_level indicates how many times * we've nested in includes. It will be 1 for the top level menu file. * * Returns 1 on success, < 0 on error. */ static int parse_pxefile_top(char *p, struct pxe_menu *cfg, int nest_level) { struct token t; char *s, *b, *label_name; int err; b = p; if (nest_level > MAX_NEST_LEVEL) { printf("Maximum nesting (%d) exceeded\n", MAX_NEST_LEVEL); return -EMLINK; } while (1) { s = p; get_token(&p, &t, L_KEYWORD); err = 0; switch (t.type) { case T_MENU: err = parse_menu(&p, cfg, b, nest_level); break; case T_TIMEOUT: err = parse_integer(&p, &cfg->timeout); break; case T_LABEL: err = parse_label(&p, cfg); break; case T_DEFAULT: err = parse_sliteral(&p, &label_name); if (label_name) { if (cfg->default_label) free(cfg->default_label); cfg->default_label = label_name; } break; case T_INCLUDE: err = handle_include(&p, b + ALIGN(strlen(b), 4), cfg, nest_level + 1); break; case T_PROMPT: err = parse_integer(&p, &cfg->prompt); break; case T_EOL: break; case T_EOF: return 1; default: printf("Ignoring unknown command: %.*s\n", (int)(p - s), s); eol_or_eof(&p); } if (err < 0) return err; } } /* * Free the memory used by a pxe_menu and its labels. */ static void destroy_pxe_menu(struct pxe_menu *cfg) { struct list_head *pos, *n; struct pxe_label *label; if (cfg->title) free(cfg->title); if (cfg->default_label) free(cfg->default_label); list_for_each_safe(pos, n, &cfg->labels) { label = list_entry(pos, struct pxe_label, list); label_destroy(label); } free(cfg); } /* * Entry point for parsing a pxe file. This is only used for the top level * file. * * Returns NULL if there is an error, otherwise, returns a pointer to a * pxe_menu struct populated with the results of parsing the pxe file (and any * files it includes). The resulting pxe_menu struct can be free()'d by using * the destroy_pxe_menu() function. */ static struct pxe_menu *parse_pxefile(char *menucfg) { struct pxe_menu *cfg; cfg = malloc(sizeof(struct pxe_menu)); if (!cfg) return NULL; memset(cfg, 0, sizeof(struct pxe_menu)); INIT_LIST_HEAD(&cfg->labels); if (parse_pxefile_top(menucfg, cfg, 1) < 0) { destroy_pxe_menu(cfg); return NULL; } return cfg; } /* * Converts a pxe_menu struct into a menu struct for use with U-boot's generic * menu code. */ static struct menu *pxe_menu_to_menu(struct pxe_menu *cfg) { struct pxe_label *label; struct list_head *pos; struct menu *m; int err; /* * Create a menu and add items for all the labels. */ m = menu_create(cfg->title, cfg->timeout, cfg->prompt, label_print); if (!m) return NULL; list_for_each(pos, &cfg->labels) { label = list_entry(pos, struct pxe_label, list); if (menu_item_add(m, label->name, label) != 1) { menu_destroy(m); return NULL; } } /* * After we've created items for each label in the menu, set the * menu's default label if one was specified. */ if (cfg->default_label) { err = menu_default_set(m, cfg->default_label); if (err != 1) { if (err != -ENOENT) { menu_destroy(m); return NULL; } printf("Missing default: %s\n", cfg->default_label); } } return m; } /* * Try to boot any labels we have yet to attempt to boot. */ static void boot_unattempted_labels(struct pxe_menu *cfg) { struct list_head *pos; struct pxe_label *label; list_for_each(pos, &cfg->labels) { label = list_entry(pos, struct pxe_label, list); if (!label->attempted) label_boot(label); } } /* * Boot the system as prescribed by a pxe_menu. * * Use the menu system to either get the user's choice or the default, based * on config or user input. If there is no default or user's choice, * attempted to boot labels in the order they were given in pxe files. * If the default or user's choice fails to boot, attempt to boot other * labels in the order they were given in pxe files. * * If this function returns, there weren't any labels that successfully * booted, or the user interrupted the menu selection via ctrl+c. */ static void handle_pxe_menu(struct pxe_menu *cfg) { void *choice; struct menu *m; int err; m = pxe_menu_to_menu(cfg); if (!m) return; err = menu_get_choice(m, &choice); menu_destroy(m); /* * err == 1 means we got a choice back from menu_get_choice. * * err == -ENOENT if the menu was setup to select the default but no * default was set. in that case, we should continue trying to boot * labels that haven't been attempted yet. * * otherwise, the user interrupted or there was some other error and * we give up. */ if (err == 1) label_boot(choice); else if (err != -ENOENT) return; boot_unattempted_labels(cfg); } /* * Boots a system using a pxe file * * Returns 0 on success, 1 on error. */ static int do_pxe_boot(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { unsigned long pxefile_addr_r; struct pxe_menu *cfg; char *pxefile_addr_str; do_getfile = do_get_tftp; if (argc == 1) { pxefile_addr_str = from_env("pxefile_addr_r"); if (!pxefile_addr_str) return 1; } else if (argc == 2) { pxefile_addr_str = argv[1]; } else { return CMD_RET_USAGE; } if (strict_strtoul(pxefile_addr_str, 16, &pxefile_addr_r) < 0) { printf("Invalid pxefile address: %s\n", pxefile_addr_str); return 1; } cfg = parse_pxefile((char *)(pxefile_addr_r)); if (cfg == NULL) { printf("Error parsing config file\n"); return 1; } handle_pxe_menu(cfg); destroy_pxe_menu(cfg); return 0; } static cmd_tbl_t cmd_pxe_sub[] = { U_BOOT_CMD_MKENT(get, 1, 1, do_pxe_get, "", ""), U_BOOT_CMD_MKENT(boot, 2, 1, do_pxe_boot, "", "") }; int do_pxe(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { cmd_tbl_t *cp; if (argc < 2) return CMD_RET_USAGE; /* drop initial "pxe" arg */ argc--; argv++; cp = find_cmd_tbl(argv[0], cmd_pxe_sub, ARRAY_SIZE(cmd_pxe_sub)); if (cp) return cp->cmd(cmdtp, flag, argc, argv); return CMD_RET_USAGE; } U_BOOT_CMD( pxe, 3, 1, do_pxe, "commands to get and boot from pxe files", "get - try to retrieve a pxe file using tftp\npxe " "boot [pxefile_addr_r] - boot from the pxe file at pxefile_addr_r\n" ); /* * Boots a system using a local disk syslinux/extlinux file * * Returns 0 on success, 1 on error. */ int do_sysboot(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { unsigned long pxefile_addr_r; struct pxe_menu *cfg; char *pxefile_addr_str; char *filename; int prompt = 0; if (strstr(argv[1], "-p")) { prompt = 1; argc--; argv++; } if (argc < 4) return cmd_usage(cmdtp); if (argc < 5) { pxefile_addr_str = from_env("pxefile_addr_r"); if (!pxefile_addr_str) return 1; } else { pxefile_addr_str = argv[4]; } if (argc < 6) filename = getenv("bootfile"); else { filename = argv[5]; setenv("bootfile", filename); } if (strstr(argv[3], "ext2")) do_getfile = do_get_ext2; else if (strstr(argv[3], "fat")) do_getfile = do_get_fat; else { printf("Invalid filesystem: %s\n", argv[3]); return 1; } fs_argv[1] = argv[1]; fs_argv[2] = argv[2]; if (strict_strtoul(pxefile_addr_str, 16, &pxefile_addr_r) < 0) { printf("Invalid pxefile address: %s\n", pxefile_addr_str); return 1; } if (get_pxe_file(filename, (void *)pxefile_addr_r) < 0) { printf("Error reading config file\n"); return 1; } cfg = parse_pxefile((char *)(pxefile_addr_r)); if (cfg == NULL) { printf("Error parsing config file\n"); return 1; } if (prompt) cfg->prompt = 1; handle_pxe_menu(cfg); destroy_pxe_menu(cfg); return 0; } U_BOOT_CMD( sysboot, 7, 1, do_sysboot, "command to get and boot from syslinux files", "[-p] <interface> <dev[:part]> <ext2|fat> [addr] [filename]\n" " - load and parse syslinux menu file 'filename' from ext2 or fat\n" " filesystem on 'dev' on 'interface' to address 'addr'" );