From 2e0fbca2e56b546f5a8c84ef435e0c84ff428c94 Mon Sep 17 00:00:00 2001 From: belliash Date: Fri, 28 Jun 2013 18:50:13 +0200 Subject: [PATCH] Initial import --- COPYING | 339 +++++++++++++++++++++++++++ Makefile | 39 ++++ README | 34 +++ README.md | 4 - buffer.c | 126 ++++++++++ buffer.h | 40 ++++ cbsi.c | 658 +++++++++++++++++++++++++++++++++++++++++++++++++++++ cbsi.h | 74 ++++++ common.h | 38 ++++ error.c | 57 +++++ error.h | 19 ++ mimetype.c | 346 ++++++++++++++++++++++++++++ mimetype.h | 33 +++ subshell.c | 373 ++++++++++++++++++++++++++++++ subshell.h | 52 +++++ 15 files changed, 2228 insertions(+), 4 deletions(-) create mode 100644 COPYING create mode 100644 Makefile create mode 100644 README delete mode 100644 README.md create mode 100644 buffer.c create mode 100644 buffer.h create mode 100644 cbsi.c create mode 100644 cbsi.h create mode 100644 common.h create mode 100644 error.c create mode 100644 error.h create mode 100644 mimetype.c create mode 100644 mimetype.h create mode 100644 subshell.c create mode 100644 subshell.h diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..d159169 --- /dev/null +++ b/COPYING @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. By contrast, the GNU General Public +License is intended to guarantee your freedom to share and change free +software--to make sure the software is free for all its users. This +General Public License applies to most of the Free Software +Foundation's software and to any other program whose authors commit to +using it. (Some other Free Software Foundation software is covered by +the GNU Lesser General Public License instead.) You can apply it to +your programs, too. + + When we speak of free software, we are referring to freedom, not +price. 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To prevent this, we have made it clear that any +patent must be licensed for everyone's free use or not licensed at all. + + The precise terms and conditions for copying, distribution and +modification follow. + + GNU GENERAL PUBLIC LICENSE + TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION + + 0. This License applies to any program or other work which contains +a notice placed by the copyright holder saying it may be distributed +under the terms of this General Public License. The "Program", below, +refers to any such program or work, and a "work based on the Program" +means either the Program or any derivative work under copyright law: +that is to say, a work containing the Program or a portion of it, +either verbatim or with modifications and/or translated into another +language. (Hereinafter, translation is included without limitation in +the term "modification".) Each licensee is addressed as "you". + +Activities other than copying, distribution and modification are not +covered by this License; they are outside its scope. The act of +running the Program is not restricted, and the output from the Program +is covered only if its contents constitute a work based on the +Program (independent of having been made by running the Program). +Whether that is true depends on what the Program does. + + 1. You may copy and distribute verbatim copies of the Program's +source code as you receive it, in any medium, provided that you +conspicuously and appropriately publish on each copy an appropriate +copyright notice and disclaimer of warranty; keep intact all the +notices that refer to this License and to the absence of any warranty; +and give any other recipients of the Program a copy of this License +along with the Program. + +You may charge a fee for the physical act of transferring a copy, and +you may at your option offer warranty protection in exchange for a fee. + + 2. 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IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR +REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, +INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING +OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED +TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY +YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER +PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE +POSSIBILITY OF SUCH DAMAGES. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. It is safest +to attach them to the start of each source file to most effectively +convey the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..49525ad --- /dev/null +++ b/Makefile @@ -0,0 +1,39 @@ +CC = gcc +CFLAGS = -O2 -s -D_GNU_SOURCE +LDLIBS = +PREFIX = +BINDIR = $(PREFIX)/usr/bin + +all: cbsi + @echo "All done!" + +cbsi: buffer.o cbsi.o error.o mimetype.o subshell.o + $(CC) $(CFLAGS) $(LDLIBS) buffer.o cbsi.o error.o mimetype.o subshell.o -o cbsi + +buffer.o: buffer.c + $(CC) $(CFLAGS) -c buffer.c + +cbsi.o: cbsi.c + $(CC) $(CFLAGS) -c cbsi.c + +error.o: error.c + $(CC) $(CFLAGS) -c error.c + +mimetype.o: mimetype.c + $(CC) $(CFLAGS) -c mimetype.c + +subshell.o: subshell.c + $(CC) $(CFLAGS) -c subshell.c + +install: + mkdir -p $(BINDIR) + cp cbsi $(BINDIR) + @echo "All done!" + +uninstall: + @rm -f $(BINDIR)/cbsi + @echo "All done!" + +clean: + rm -f cbsi *.o + @echo "All done!" diff --git a/README b/README new file mode 100644 index 0000000..5cb8615 --- /dev/null +++ b/README @@ -0,0 +1,34 @@ +CGI Bash Shell Interface +======================== + +CBSI is a small program that makes CGI programming in the Bash Shell a lot +easier, or at least more tolerable. It is intended for Kagera Firmware, where +other languages are too big. + +It parses POST and GET requests in addiction to COOKIES, placing elements as +`name=value` pairs into the environment for the CGI script to use. + +It combines three features into an engine: + * It opens a shell, and translates all text into printable statements. All + text within <% ... %> constructs are passed verbatim to the shell. + * It opens a shell, and prints the shell expression. Everything within + <%: ... %> tags are supposed to be parsed into 'echo' statement. + * It supports multilanguage and allows to easily put all texts within + <%@ ... %> tags to be quick and easily translated into chosen language. + +Additional parameters that can be passed to CBSI: + * --language-dir=pathspec - specifies a directory where CBSI should look for + scripts translations. Default value is + '/usr/lib/kagera/langs' + * --shell=pathspec - specifies an alternate bash-like shell to use. + This defaults to '/bin/sh' + * --translation=filename - specifies a dictionary filename to be loaded in + addiction to common.dic from language directory. + The extension is added automatically. + * --upload-dir=pathspec - this specifies a temporary directory where all + uploaded files are created. Defaults to '/tmp' + * --upload-limit=limit - allows a mime-encoded file up to limit KB to be + uploaded. The default value is 0KB (no limit). + + +This software is based on Haserl . diff --git a/README.md b/README.md deleted file mode 100644 index 8fcfa46..0000000 --- a/README.md +++ /dev/null @@ -1,4 +0,0 @@ -cbsi -==== - -CGI Bash Shell Interface diff --git a/buffer.c b/buffer.c new file mode 100644 index 0000000..342894d --- /dev/null +++ b/buffer.c @@ -0,0 +1,126 @@ +/** + * @PROJECT CGI Bash Shell Interface + * @COPYRIGHT See COPYING in the top level directory + * @FILE buffer.c + * @PURPOSE CBSI Buffers + * @DEVELOPERS Nathan Angelacos + * Rafal Kupiec + */ + +#include +#include +#include +#include +#include +#include +#include + +#include "buffer.h" + +void buffer_add(buffer_t* buf, const void* data, unsigned long size) { + unsigned long newsize; + unsigned long index; + + if((buf->ptr + size) >= buf->limit) { + index = (buf->limit - buf->data); + newsize = index; + while(newsize <= index + size) { + newsize += 1024; + } + index = buf->ptr - buf->data; + buf->data = realloc(buf->data, newsize); + buf->limit = buf->data + newsize; + buf->ptr = buf->data + index; + } + memcpy(buf->ptr, data, size); + buf->ptr += size; +} + +void buffer_destroy(buffer_t* buf) { + if(buf->data) { + free(buf->data); + } + buffer_init(buf); +} + +void buffer_init(buffer_t* buf) { + buf->data = NULL; + buf->ptr = NULL; + buf->limit = NULL; +} + +void buffer_reset(buffer_t* buf) { + if(buf->data) { + buf->ptr = buf->data; + } else { + buf->ptr = NULL; + } +} + +void sbuffer_destroy(sbuffer_t* sbuf) { + free(sbuf->buf); +} + +int sbuffer_init(sbuffer_t* sbuf, int size) { + sbuf->maxsize = size; + sbuf->buf = malloc (sbuf->maxsize); + sbuf->maxsize -= 1; + sbuf->fh = 0; + sbuf->eof = 0; + sbuf->len = 0; + sbuf->ptr = sbuf->buf; + sbuf->bufsize = 0; + sbuf->maxread = 0; + sbuf->nrread = 0; + return (sbuf->buf != NULL); +} + +int sbuffer_read(sbuffer_t* sbuf, char* matchstr) { + int len, pos; + int r; + + if((sbuf->eof) && (sbuf->ptr > sbuf->buf)) { + return 0; + } + if((sbuf->bufsize == 0) || (sbuf->ptr >= (sbuf->buf + sbuf->bufsize - strlen (matchstr)))) { + len = sbuf->bufsize - (sbuf->ptr - sbuf->buf); + if(len) { + memmove(sbuf->buf, sbuf->ptr, len); + } + sbuf->ptr = sbuf->buf; + sbuf->bufsize = len; + if(fcntl(sbuf->fh, F_GETFL) == -1) { + r = 0; + } else { + size_t n = sbuf->maxsize - len; + if(sbuf->maxread && sbuf->maxread < sbuf->nrread + n) { + n = sbuf->maxread - sbuf->nrread; + } + r = read(sbuf->fh, sbuf->buf + len, n); + } + if(r == 0 || (r < 0 && errno != EINTR)) { + sbuf->eof = -1; + } else { + sbuf->bufsize += (r > 0) ? r : 0; + sbuf->nrread += (r > 0) ? r : 0; + } + } + pos = 0; + len = sbuf->bufsize - (int) (sbuf->ptr - sbuf->buf) - strlen(matchstr); + while(memcmp(matchstr, sbuf->ptr + pos, strlen(matchstr)) && (pos < len)) { + pos++; + } + if(pos < len) { + sbuf->len = pos; + sbuf->segment = sbuf->ptr; + sbuf->ptr = sbuf->segment + pos + strlen(matchstr); + return -1; + } + if(sbuf->eof) { + len += strlen(matchstr); + } + sbuf->segment = sbuf->ptr; + sbuf->len = len; + sbuf->ptr += sbuf->len; + return (sbuf->eof) ? (-1) : (0); +} diff --git a/buffer.h b/buffer.h new file mode 100644 index 0000000..f625511 --- /dev/null +++ b/buffer.h @@ -0,0 +1,40 @@ +/** + * @PROJECT CGI Bash Shell Interface + * @COPYRIGHT See COPYING in the top level directory + * @FILE buffer.h + * @PURPOSE CBSI Buffers + * @DEVELOPERS Nathan Angelacos + * Rafal Kupiec + */ + +#ifndef __BUFFER_H +#define __BUFFER_H + +typedef struct { + unsigned char* data; + unsigned char* ptr; + unsigned char* limit; +} buffer_t; + +typedef struct { + int fh; + unsigned char* buf; + unsigned char* ptr; + unsigned char* segment; + size_t len; + size_t maxsize; + size_t bufsize; + size_t maxread; + size_t nrread; + int eof; +} sbuffer_t; + +void buffer_add(buffer_t* buf, const void* data, unsigned long size); +void buffer_destroy(buffer_t* buf); +void buffer_init(buffer_t* buf); +void buffer_reset(buffer_t* buf); +void sbuffer_destroy(sbuffer_t* sbuf); +int sbuffer_init(sbuffer_t* sbuf, int size); +int sbuffer_read(sbuffer_t* sbuf, char* matchstr); + +#endif diff --git a/cbsi.c b/cbsi.c new file mode 100644 index 0000000..4cecb1c --- /dev/null +++ b/cbsi.c @@ -0,0 +1,658 @@ +/** + * @PROJECT CGI Bash Shell Interface + * @COPYRIGHT See COPYING in the top level directory + * @FILE cbsi.c + * @PURPOSE Common CBSI + * @DEVELOPERS Nathan Angelacos + * Rafal Kupiec + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "common.h" +#include "error.h" +#include "buffer.h" +#include "subshell.h" +#include "mimetype.h" +#include "cbsi.h" + +struct option ga_long_options[] = { + {"language-dir", required_argument, 0, 'l'}, + {"translation", required_argument, 0, 't'}, + {"upload-limit", required_argument, 0, 'u'}, + {"upload-dir", required_argument, 0, 'd'}, + {"shell", required_argument, 0, 's'}, + {0, 0, 0, 0} +}; + +const char *gs_short_options = "+u:d:l:t:s:"; + +int argc_argv(char* instr, argv_t** argv) { + char quote = '\0'; + int arg_count = 0; + enum state_t { WHITESPACE, WORDSPACE, TOKENSTART } state = WHITESPACE; + argv_t* argv_array = NULL; + int argc_slots = 0; + size_t len, pos; + + len = strlen(instr); + pos = 0; + while(pos < len) { + switch(*instr) { + case '"': + case '\'': + if(state == WHITESPACE) { + quote = *instr; + state = TOKENSTART; + if(*(instr + 1) == quote) { + quote = '\0'; + *instr = '\0'; + argv_array[arg_count].quoted = -1; + } else { + instr++; + pos++; + } + } else { + if(*instr == quote) { + argv_array[arg_count - 1].quoted = -1; + quote = '\0'; + *instr = '\0'; + state = WHITESPACE; + } + } + break; + case '\\': + if((quote) && (*(instr + 1) == quote)) { + memmove(instr, instr + 1, strlen(instr)); + len--; + } else { + if(state == WHITESPACE) { + state = TOKENSTART; + } + } + break; + case ' ': + case '\t': + case '\r': + case '\n': + if((state == WORDSPACE) && (quote == '\0')) { + state = WHITESPACE; + *instr = '\0'; + } + break; + case '\0': + break; + default: + if(state == WHITESPACE) { + state = TOKENSTART; + } + } + if(state == TOKENSTART) { + arg_count++; + if(arg_count > argc_slots) { + argc_slots += ALLOC_CHUNK; + argv_array = (argv_t*) xrealloc(argv_array, sizeof(argv_t) * (argc_slots + ALLOC_CHUNK)); + } + if(argv_array == NULL) { + return -1; + } + argv_array[arg_count - 1].string = instr; + argv_array[arg_count].quoted = 0; + state = WORDSPACE; + } + instr++; + pos++; + } + argv_array[arg_count].string = NULL; + *argv = argv_array; + return arg_count; +} + +void assignGlobalStartupValues() { + global.uploadkb = -1; + global.shell = SUBSHELL_CMD; + global.langdir = LANGDIR; + global.translation = NULL; + global.uploaddir = TEMPDIR; + global.uploadlist = NULL; + global.file_prefix = "FILE_"; + global.filename_prefix = "FILENAME_"; + global.get_prefix = "GET_"; + global.post_prefix = "POST_"; + global.cbsi_prefix = "CBSI_"; + global.cookie_prefix = "COOKIE_"; + global.null_prefix = ""; +} + +int BecomeUser(uid_t uid, gid_t gid) { + if(getuid() == 0) { + setgroups(1, &gid); + } + setgid(gid); + setgid(getgid()); + setuid(uid); + setuid(getuid()); + return 0; +} + +void cbsiflags(list_t* env) { + char buf[200]; + + snprintf(buf, 200, "UPLOAD_DIR=%s", global.uploaddir); + myputenv(env, buf, global.cbsi_prefix); + snprintf(buf, 200, "UPLOAD_LIMIT=%lu", global.uploadkb); + myputenv(env, buf, global.cbsi_prefix); + snprintf(buf, 200, "SHELL=%s", global.shell); + myputenv(env, buf, global.cbsi_prefix); +} + +void cleanup(void) { + int i; + + if(global.uploadlist) { + unlink_uploadlist(); + free_token_list(global.uploadlist); + global.uploadlist = NULL; + } + if(language != NULL && translations > 0) { + for (i = 0; i < HASH_BUF; ++i) { + if(ltable[i]) { + free(ltable[i]->msgid); + free(ltable[i]->msgstr); + free(ltable[i]); + } + } + } +} + +void CookieVars(list_t* env) { + char* qs; + char* token; + + if(getenv("HTTP_COOKIE") != NULL) { + qs = strdup(getenv("HTTP_COOKIE")); + } else { + return; + } + token = strtok(qs, ";"); + while(token) { + while(token[0] == ' ') { + token++; + } + myputenv(env, token, global.cookie_prefix); + token = strtok(NULL, ";"); + } + free(qs); +} + +int count_lines(char* instr, size_t len, char* where) { + size_t line = 1; + + while((where > instr) && (len)) { + if(*instr == '\n') { + line++; + } + len--; + instr++; + } + return line; +} + +char* find_whitespace(char* instr) { + while(!isspace(*instr) && *instr) { + instr++; + } + return instr; +} + +void free_list_chain(list_t* list) { + list_t *next; + + while(list) { + next = list->next; + free(list->buf); + free(list); + list = next; + } +} + +unsigned short generateHash(char* str) { + unsigned long hash = 5381; + int c; + + while(c = *str++) { + hash = ((hash << 5) + hash) + c; + } + return hash % HASH_BUF; +} + +void loadDictionary(const char* filename) { + char* b; + FILE* fp; + short hash; + char msgid[TRANS_BUF]; + char msgstr[TRANS_BUF]; + lstr* p; + lstr* s; + + sprintf(buffer, "%s/%s/%s.dic", global.langdir, language, filename); + if((fp = fopen(buffer, "r")) != NULL) { + memset(ltable, 0, sizeof(lstr*) * HASH_BUF); + memset(msgid, '\0', TRANS_BUF); + memset(msgstr, '\0', TRANS_BUF); + while(!feof(fp) && (fgets(buffer, TRANS_BUF - 1, fp) != NULL)) { + b = skip_whitespace(buffer); + if((!*b) || (*b == '#')) { + continue; + } + if(strstr(b, "msgid") != NULL) { + b = trim(b + 5); + strncpy(msgid, b, strlen(b) + 1); + } else if(strstr(b, "msgstr") != NULL) { + b = trim(b + 6); + strncpy(msgstr, b, strlen(b) + 1); + } else { + continue; + } + if(msgid[0] != 0 && msgstr[0] != 0) { + hash = generateHash(msgid); + s = malloc(sizeof(lstr)); + s->msgid = (char*) malloc(strlen(msgid) + 1); + s->msgstr = (char*) malloc(strlen(msgstr) + 1); + strcpy(s->msgid, msgid); + strcpy(s->msgstr, msgstr); + s->next = NULL; + if(ltable[hash] == NULL) { + ltable[hash] = s; + } else { + for(p = ltable[hash]; p->next != NULL; p = p->next); + p->next = s; + } + translations++; + msgid[0] = 0; + msgstr[0] = 0; + } + } + fclose(fp); + } +} + +void lowercase(char* instr) { + while(*instr != '\0') { + *instr = tolower (*instr); + instr++; + } +} + +int main(int argc, char* argv[]) { + token_t* tokenchain = NULL; + buffer_t script_text; + script_t* scriptchain; + int retval = 0; + char* filename = NULL; + argv_t* av = NULL; + char** av2 = argv; + int av2c = argc; + int command; + int count; + list_t* env = NULL; + + if(atexit(cleanup) != 0) { + die_with_message(NULL, NULL, "atexit() failed"); + } + assignGlobalStartupValues(); + buffer_init(&script_text); + switch(argc) { + case 1: + puts("This is CBSI version " CBSI_VERSION "\nThis program runs as a CGI interface, not interactively.\n"); + return 0; + break; + default: + command = argc_argv(argv[1], &av); + if(command > 1) { + av2c = argc - 1 + command; + av2 = xmalloc(sizeof(char*) * av2c); + av2[0] = argv[0]; + for(count = 1; count <= command; count++) { + av2[count] = av[count - 1].string; + } + for(; count < av2c; count++) { + av2[count] = argv[count - command + 1]; + } + } + parseCommandLine(av2c, av2); + free(av); + if(av2 != argv) { + free(av2); + } + if(optind < av2c) { + filename = av2[optind]; + } else { + die_with_message(NULL, NULL, "No script file specified"); + } + break; + } + scriptchain = load_script(filename, NULL); + BecomeUser(scriptchain->uid, scriptchain->gid); + env = wcversion(env); + readenv(env); + sessionid(env); + cbsiflags(env); + prepareDictionary(); + tokenchain = build_token_list(scriptchain, NULL); + preprocess_token_list(tokenchain); + CookieVars(env); + ReadCGIPOSTValues(env); + ReadCGIQueryString(env); + process_token_list(&script_text, tokenchain); + subshell_setup(global.shell, env); + subshell_doscript(&script_text, scriptchain->name); + subshell_destroy(); + buffer_destroy(&script_text); + free_token_list(tokenchain); + free_list_chain(env); + free_script_list(scriptchain); + return 0; +} + +list_t* myputenv(list_t* cur, char* str, char* prefix) { + list_t* prev = NULL; + size_t keylen; + char* entry = NULL; + char* temp = NULL; + int array = 0; + int len; + + temp = memchr(str, '=', strlen(str)); + if(temp == 0) { + return cur; + } + keylen = (size_t) (temp - str); + if(memcmp(str + keylen - 2, "[]", 2) == 0) { + keylen = keylen - 2; + array = 1; + } + entry = xmalloc(strlen (str) + strlen(prefix) + 1); + entry[0] = '\0'; + if(strlen(prefix)) { + strncat(entry, prefix, strlen(prefix)); + } + if(array == 1) { + strncat(entry, str, keylen); + strcat(entry, str + keylen + 2); + } else { + strcat(entry, str); + } + len = keylen + strlen(prefix) + 1; + while(cur != NULL) { + if(memcmp(cur->buf, entry, len) == 0) { + if(array == 1) { + temp = xmalloc(strlen(cur->buf) + strlen(entry) - len + 2); + memmove(temp, cur->buf, strlen(cur->buf) + 1); + strcat(temp, "\n"); + strcat(temp, str + keylen + 3); + free(entry); + entry = temp; + } + free(cur->buf); + if(prev != NULL) { + prev->next = cur->next; + } + free(cur); + cur = prev; + } + prev = cur; + if(cur) { + cur = (list_t*) cur->next; + } + } + cur = xmalloc(sizeof(list_t)); + cur->buf = entry; + if(prev != NULL) { + prev->next = cur; + } + return cur; +} + +int parseCommandLine(int argc, char *argv[]) { + int c; + int option_index = 0; + + optopt = 0; + optind = 0; + while((c = getopt_long(argc, argv, gs_short_options, ga_long_options, &option_index)) != -1) { + switch(c) { + case 's': + global.shell = optarg; + break; + case 'u': + global.uploadkb = atoi (optarg); + break; + case 'l': + global.langdir = optarg; + break; + case 't': + global.translation = optarg; + break; + case 'd': + global.uploaddir = optarg; + break; + } + } + return optind; +} + +void prepareDictionary() { + translations = 0; + if(getenv("WEBUI_LANGUAGE") != NULL) { + language = strdup(getenv("WEBUI_LANGUAGE")); + if(global.translation != NULL) { + loadDictionary(global.translation); + } else { + loadDictionary("common"); + } + } +} + +int ReadCGIPOSTValues(list_t* env) { + size_t content_length = 0; + size_t max_len; + size_t i, j, x; + sbuffer_t sbuf; + buffer_t token; + unsigned char* data; + const char* CONTENT_LENGTH = "CONTENT_LENGTH"; + + if((getenv(CONTENT_LENGTH) == NULL) || (strtoul(getenv(CONTENT_LENGTH), NULL, 10) == 0)) { + return 0; + } + if(getenv("CONTENT_TYPE")) { + if(strncasecmp(getenv("CONTENT_TYPE"), "multipart/form-data", 19) == 0) { + i = rfc2388_handler(env); + return i; + } + } + sbuffer_init(&sbuf, 32768); + sbuf.fh = STDIN; + if(getenv(CONTENT_LENGTH)) { + sbuf.maxread = strtoul(getenv(CONTENT_LENGTH), NULL, 10); + } + buffer_init(&token); + max_len = ((global.uploadkb == 0) ? 2048 : abs(global.uploadkb)) * 1024; + do { + x = sbuffer_read(&sbuf, "&"); + content_length += sbuf.len; + if(content_length >= max_len && global.uploadkb != -1) { + die_with_message(NULL, NULL, "Attempted to send content larger than allowed limits."); + } + if((x == 0) || (token.data)) { + buffer_add(&token, (char*) sbuf.segment, sbuf.len); + } + if(x) { + data = sbuf.segment; + sbuf.segment[sbuf.len] = '\0'; + if(token.data) { + buffer_add(&token, sbuf.segment + sbuf.len, 1); + data = token.data; + } + j = strlen((char*) data); + for(i = 0; i <= j; i++) { + if(data[i] == '+') { + data[i] = ' '; + } + } + unescape_url((char*) data); + myputenv(env, (char*) data, global.post_prefix); + if(token.data) { + buffer_reset(&token); + } + } + } while(!sbuf.eof); + sbuffer_destroy(&sbuf); + buffer_destroy(&token); + return 0; +} + +int ReadCGIQueryString(list_t* env) { + char* qs; + char* token; + int i; + + if(getenv("QUERY_STRING") != NULL) { + qs = strdup(getenv("QUERY_STRING")); + } else { + return 0; + } + for(i = 0; qs[i]; i++) { + if(qs[i] == '+') { + qs[i] = ' '; + } + } + token = strtok(qs, "&;"); + while(token) { + unescape_url(token); + myputenv(env, token, global.get_prefix); + token = strtok(NULL, "&;"); + } + free(qs); + return 0; +} + +void readenv(list_t* env) { + extern char** environ; + int count = 0; + + while(environ[count] != NULL) { + myputenv(env, environ[count], global.null_prefix); + count++; + } +} + +void sessionid(list_t* env) { + char session[29]; + + sprintf(session, "SESSIONID=%x%x", getpid(), (int) time(NULL)); + myputenv(env, session, global.cbsi_prefix); +} + +char* skip_whitespace(char* instr) { + while(isspace(*instr) && *instr) { + instr++; + } + return instr; +} + +char* trim(char* str) { + char* end; + + while(isspace(*str) || *str == '"') { + str++; + } + if(*str == 0) { + return str; + } + end = str + strlen(str) - 1; + while(end > str && (isspace(*end) || *end == '"')) { + end--; + } + *(end + 1) = 0; + return str; +} + +void unescape_url(char* url) { + int i, j; + + for(i = 0, j = 0; url[j]; ++i, ++j) { + if((url[i] = url[j]) != '%') { + continue; + } + if(!url[j + 1] || !url[j + 2]) { + break; + } + url[i] = x2c(&url[j + 1]); + j += 2; + } + url[i] = '\0'; +} + +void unlink_uploadlist() { + token_t* me; + me = global.uploadlist; + + while(me) { + unlink(me->buf); + free(me->buf); + me = me->next; + } +} + +void uppercase(char* instr) { + while(*instr != '\0') { + *instr = toupper(*instr); + instr++; + } +} + +list_t* wcversion(list_t* env) { + char version[200]; + + sprintf(version, "VERSION=%s", CBSI_VERSION); + return(myputenv(env, version, global.cbsi_prefix)); +} + +char x2c(char* what) { + char digit; + + digit = (what[0] >= 'A' ? ((what[0] & 0xdf) - 'A') + 10 : (what[0] - '0')); + digit *= 16; + digit += (what[1] >= 'A' ? ((what[1] & 0xdf) - 'A') + 10 : (what[1] - '0')); + return digit; +} + +void* xmalloc(size_t size) { + void* buf; + + if((buf = malloc(size)) == NULL) { + die_with_message(NULL, NULL, g_err_msg[E_MALLOC_FAIL]); + } + memset(buf, 0, size); + return buf; +} + +void* xrealloc(void* buf, size_t size) { + if((buf = realloc(buf, size)) == NULL) { + die_with_message(NULL, NULL, g_err_msg[E_MALLOC_FAIL]); + } + return buf; +} diff --git a/cbsi.h b/cbsi.h new file mode 100644 index 0000000..fc75ea5 --- /dev/null +++ b/cbsi.h @@ -0,0 +1,74 @@ +/** + * @PROJECT CGI Bash Shell Interface + * @COPYRIGHT See COPYING in the top level directory + * @FILE cbsi.h + * @PURPOSE Common CBSI + * @DEVELOPERS Nathan Angelacos + * Rafal Kupiec + */ + +#ifndef __CBSI_H +#define __CBSI_H + +typedef struct { + unsigned long uploadkb; + char* shell; + char* langdir; + char* translation; + char* uploaddir; + char* uploadhandler; + char* file_prefix; + char* filename_prefix; + char* get_prefix; + char* post_prefix; + char* cookie_prefix; + char* null_prefix; + char* cbsi_prefix; + token_t* uploadlist; + int debug; + int acceptall; + int silent; +} cbsi_t; + +typedef struct lstr { + char* msgid; + char* msgstr; + struct lstr* next; +} lstr; + +cbsi_t global; +char buffer[TRANS_BUF]; +char* language; +lstr* ltable[HASH_BUF]; +int translations; + +int argc_argv(char* instr, argv_t** argv); +void assignGlobalStartupValues(void); +int BecomeUser(uid_t uid, gid_t gid); +void cbsiflags(list_t* env); +void cleanup(void); +void CookieVars(list_t* env); +int count_lines(char* instr, size_t len, char* where); +char* find_whitespace (char* instr); +void free_list_chain(list_t* env); +unsigned short generateHash(char* str); +void loadDictionary(const char* filename); +void lowercase(char* instr); +list_t* myputenv(list_t* cur, char* str, char* prefix); +int parseCommandLine(int argc, char* argv[]); +void prepareDictionary(); +int ReadCGIPOSTValues(list_t* env); +int ReadCGIQueryString(list_t* env); +void readenv(list_t* env); +void sessionid(list_t* env); +char* skip_whitespace (char* instr); +char* trim(char* str); +void unescape_url(char* url); +void unlink_uploadlist(void); +void uppercase(char* instr); +list_t* wcversion(list_t* env); +char x2c(char* what); +void* xmalloc(size_t size); +void* xrealloc(void* buf, size_t size); + +#endif diff --git a/common.h b/common.h new file mode 100644 index 0000000..2e031db --- /dev/null +++ b/common.h @@ -0,0 +1,38 @@ +/** + * @PROJECT CGI Bash Shell Interface + * @COPYRIGHT See COPYING in the top level directory + * @FILE common.h + * @PURPOSE Common CBSI + * @DEVELOPERS Nathan Angelacos + * Rafal Kupiec + */ + +#ifndef __COMMON_H +#define __COMMON_H + +#define ALLOC_CHUNK 10 + +#define CBSI_VERSION "0.91" + +#define STDIN 0 +#define STDOUT 1 +#define STDERR 2 + +#define HASH_BUF 1536 +#define TRANS_BUF 2048 + +#define LANGDIR "/usr/lib/kagera/langs" +#define SUBSHELL_CMD "/bin/sh" +#define TEMPDIR "/tmp" + +typedef struct { + char* string; + unsigned char quoted; +} argv_t; + +typedef struct { + char* buf; + void* next; +} list_t; + +#endif diff --git a/error.c b/error.c new file mode 100644 index 0000000..9517e64 --- /dev/null +++ b/error.c @@ -0,0 +1,57 @@ +/** + * @PROJECT CGI Bash Shell Interface + * @COPYRIGHT See COPYING in the top level directory + * @FILE error.c + * @PURPOSE Error handling + * @DEVELOPERS Nathan Angelacos + * Rafal Kupiec + */ + +#include +#include +#include +#include +#include +#include + +#include "common.h" +#include "buffer.h" +#include "subshell.h" +#include "cbsi.h" +#include "error.h" + +char* g_err_msg[] = { + "", + "Memory Allocation Failure", + "Unable to open file %s", + "%c> before <%c", + "Missing %c>", + "Unknown operation", + "Unable to start subshell", + "Unspecified Error", +}; + +void die_with_error(char* msg) { + fprintf(stderr, "Error: %s\n", msg); + exit(-1); +} + +void die_with_message(void* sp, char* where, const char* s, ...) { + script_t* script = sp; + va_list p; + FILE* fo = stderr; + + fo = stdout; + fprintf(fo, "HTTP/1.0 500 Server Error\nContent-Type: text/html\n\nCBSI Error
\n");
+	va_start(p, s);
+	vfprintf(fo, s, p);
+	va_end(p);
+	if(where && sp) {
+		fprintf(fo, " near line %d of %s\n",
+		count_lines(script->buf, script->size, where),
+		script->name);
+	}
+	printf("\n");
+	fprintf(fo, "
\n"); + exit(-1); +} diff --git a/error.h b/error.h new file mode 100644 index 0000000..197a8e8 --- /dev/null +++ b/error.h @@ -0,0 +1,19 @@ +/** + * @PROJECT CGI Bash Shell Interface + * @COPYRIGHT See COPYING in the top level directory + * @FILE error.h + * @PURPOSE Error handling + * @DEVELOPERS Nathan Angelacos + * Rafal Kupiec + */ + +#ifndef __ERROR_H +#define __ERROR_H + +enum error_types { E_NO_ERROR, E_MALLOC_FAIL, E_FILE_OPEN_FAIL, E_END_BEFORE_BEGIN, E_NO_END_MARKER , E_NO_OP, E_SUBSHELL_FAIL, E_WHATEVER }; +extern char *g_err_msg[]; + +void die_with_error(char* msg); +void die_with_message(void* sp, char* where, const char* s, ...); + +#endif diff --git a/mimetype.c b/mimetype.c new file mode 100644 index 0000000..c7a4295 --- /dev/null +++ b/mimetype.c @@ -0,0 +1,346 @@ +/** + * @PROJECT CGI Bash Shell Interface + * @COPYRIGHT See COPYING in the top level directory + * @FILE mimetype.c + * @PURPOSE Mimetype and file upload handler + * @DEVELOPERS Nathan Angelacos + * Rafal Kupiec + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "common.h" +#include "buffer.h" +#include "error.h" +#include "subshell.h" +#include "buffer.h" +#include "mimetype.h" +#include "cbsi.h" + +void empty_stdin(void) { + char c[2000]; + while(read(STDIN_FILENO, &c, 2000)) { + } +} + +void mime_var_init(mime_var_t* obj) { + obj->name = NULL; + obj->filename = NULL; + obj->type = NULL; + obj->tempname = NULL; + buffer_init(&(obj->value)); + obj->fh = 0; +} + +void mime_var_destroy(mime_var_t* obj) { + int status; + struct sigaction new_action; + + if(obj->name) { + free(obj->name); + obj->name = NULL; + } + if(obj->filename) { + free(obj->filename); + obj->filename = NULL; + } + if(obj->type) { + free(obj->type); + obj->type = NULL; + } + if(obj->tempname) { + free(obj->tempname); + obj->tempname = NULL; + } + buffer_destroy(&(obj->value)); + if(obj->fh) { + close(abs(obj->fh)); + obj->fh = 0; + } +} + +char* mime_substr(char* start, int len) { + char* ptr; + + if(!start) { + return NULL; + } + if(len < 0) { + return NULL; + } + ptr = xmalloc(len + 2); + memcpy(ptr, start, len); + return ptr; +} + +void mime_tag_add(mime_var_t* obj, char* str) { + char* a = NULL; + char* b = NULL; + static char* tag[] = { "name=\"", "filename=\"", "Content-Type: " }; + + a = strcasestr(str, tag[0]); + if(a) { + a += strlen(tag[0]); + b = strchr(a, '"'); + if(!obj->name) { + obj->name = mime_substr(a, b - a); + } + } + a = strcasestr(str, tag[1]); + if(a) { + a += strlen(tag[1]); + b = strchr(a, '"'); + if(!obj->filename) { + obj->filename = mime_substr(a, b - a); + } + } + a = strcasestr(str, tag[2]); + if(a) { + a += strlen(tag[2]); + b = a + strlen(a); + if(!obj->type) { + obj->type = mime_substr(a, b - a); + } + } +} + +void mime_var_putenv(list_t* env, mime_var_t* obj) { + buffer_t buf; + + buffer_init(&buf); + if(obj->filename) { + buffer_add(&buf, obj->name, strlen(obj->name)); + buffer_add(&buf, "=", 1); + buffer_add(&buf, (char*) obj->value.data, + strlen((char*) obj->value.data) + 1); + myputenv(env, (char*) buf.data, global.file_prefix); + buffer_reset(&buf); + buffer_add(&buf, obj->name, strlen(obj->name)); + buffer_add(&buf, "=", 1); + buffer_add(&buf, obj->filename, strlen(obj->filename) + 1); + myputenv(env, (char*) buf.data, global.filename_prefix); + buffer_reset (&buf); + } else if(obj->name) { + buffer_add(&(obj->value), "", 1); + buffer_add(&buf, obj->name, strlen(obj->name)); + buffer_add(&buf, "=", 1); + buffer_add(&buf, (char*) obj->value.data, + strlen((char*) obj->value.data) + 1); + myputenv(env, (char*) buf.data, global.file_prefix); + buffer_reset(&buf); + } + buffer_destroy(&buf); +} + +void mime_exec(mime_var_t* obj, char* fifo) { + int pid; + char* type; + char* filename; + char* name; + char *c; + int fh; + struct sigaction new_action; + + pid = fork(); + if(pid == -1) { + empty_stdin(); + die_with_message(NULL, NULL, g_err_msg[E_SUBSHELL_FAIL]); + } + if(pid == 0) { + if(obj->type) { + type = xmalloc(13 + strlen(obj->type) + 1); + sprintf(type, "CONTENT_TYPE=%s", obj->type); + putenv(type); + } + if(obj->filename) { + filename = xmalloc (9 + strlen(obj->filename) + 1); + sprintf(filename, "FILENAME=%s", obj->filename); + putenv(filename); + } + if(obj->name) { + name = xmalloc(5 + strlen(obj->name) + 1); + sprintf(name, "NAME=%s", obj->name); + putenv(name); + } + fh = open(fifo, O_RDONLY); + while(read(fh, &c, 1)) { + } + exit(-1); + } else { + new_action.sa_handler = SIG_IGN; + sigemptyset(&new_action.sa_mask); + new_action.sa_flags = 0; + sigaction(SIGPIPE, &new_action, NULL); + } +} + +void mime_var_open_target(mime_var_t* obj) { + char* tmpname; + token_t* curtoken; + curtoken = global.uploadlist; + int ok; + + if(global.uploadkb == 0) { + empty_stdin(); + die_with_message(NULL, NULL, "File uploads are not allowed."); + } + ok = -1; + tmpname = xmalloc(strlen(global.uploaddir) + 8); + strcpy(tmpname, global.uploaddir); + strcat(tmpname, "/XXXXXX"); + obj->fh = mkstemp(tmpname); + if(obj->fh == -1) { + ok = 0; + } + buffer_add(&(obj->value), tmpname, strlen(tmpname)); + if(!ok) { + empty_stdin(); + die_with_message(NULL, NULL, g_err_msg[E_FILE_OPEN_FAIL], tmpname); + } + curtoken = push_token_on_list(curtoken, NULL, tmpname, strlen(tmpname) + 1); + if(global.uploadlist == NULL) { + global.uploadlist = curtoken; + } +} + +void mime_var_writer(mime_var_t* obj, char* str, int len) { + int err; + + if(!obj->filename) { + buffer_add(&(obj->value), str, len); + } + if((!obj->fh) && (obj->filename)) { + mime_var_open_target(obj); + } + if(obj->fh > 0) { + err = write(obj->fh, str, len); + if(err == -1) { + obj->fh = abs(obj->fh) * -1; + } + } +} + +int rfc2388_handler(list_t* env) { + enum mime_state_t { DISCARD, BOUNDARY, HEADER, CONTENT }; + int state; + int i, x; + unsigned long max_len, content_length; + sbuffer_t sbuf; + char* crlf = "\r\n"; + char* boundary; + char* str; + buffer_t buf; + mime_var_t var; + + str = getenv("CONTENT_TYPE"); + i = strlen(str) - 9; + while((i >= 0) && (memcmp("boundary=", str + i, 9))) { + i--; + } + if(i == -1) { + empty_stdin(); + die_with_message(NULL, NULL, "No Mime Boundary Information Found"); + } + i = i + 9; + if(str[i] == '"') { + i++; + } + boundary = xmalloc(strlen(str + i) + 5); + memcpy(boundary, crlf, 2); + memcpy(boundary + 2, "--", 2); + memcpy(boundary + 4, str + i, strlen(str + i) + 1); + if((i > 0) && (str[i - 1] == '"')) { + while((boundary[i]) && (boundary[i] != '"')) { + i++; + } + boundary[i] = '\0'; + } + max_len = ((global.uploadkb == 0) ? 2048 : abs(global.uploadkb)) * 1024; + content_length = 0; + sbuffer_init(&sbuf, 1024 * 128); + sbuf.fh = STDIN; + if(getenv("CONTENT_LENGTH")) { + sbuf.maxread = strtoul(getenv("CONTENT_LENGTH"), NULL, 10); + } + buffer_init(&buf); + buffer_add(&buf, "", 1); + buffer_reset(&buf); + state = DISCARD; + str = boundary + 2; + do { + x = sbuffer_read(&sbuf, str); + content_length += sbuf.len; + if(content_length >= max_len && global.uploadkb != -1) { + empty_stdin(); + free(boundary); + sbuffer_destroy(&sbuf); + buffer_destroy(&buf); + if(var.name) { + mime_var_destroy(&var); + } + die_with_message(NULL, NULL, "Attempted to send content larger than allowed limits."); + } + switch(state) { + case DISCARD: + if(x) { + state = BOUNDARY; + str = crlf; + buffer_reset(&buf); + } + break; + case BOUNDARY: + if(x) { + buffer_add(&buf, sbuf.segment, sbuf.len); + if(!memcmp(buf.data, boundary + 2, 2)) { + str = boundary + 2; + state = DISCARD; + } else { + buffer_reset(&buf); + mime_var_init(&var); + state = HEADER; + str = crlf; + } + } else { + buffer_add(&buf, sbuf.segment, sbuf.len); + } + break; + case HEADER: + buffer_add(&buf, sbuf.segment, sbuf.len); + if(x) { + if(sbuf.len == 0) { + buffer_reset(&buf); + state = CONTENT; + str = boundary; + } else { + buffer_add(&buf, "", 1); + mime_tag_add(&var, (char*) buf.data); + buffer_reset(&buf); + } + } + break; + case CONTENT: + mime_var_writer(&var, (char*) sbuf.segment, sbuf.len); + if(x) { + buffer_reset(&buf); + mime_var_putenv(env, &var); + mime_var_destroy(&var); + state = BOUNDARY; + str = crlf; + } + break; + } + } while(!sbuf.eof); + free(boundary); + sbuffer_destroy(&sbuf); + buffer_destroy(&buf); + return 0; +} diff --git a/mimetype.h b/mimetype.h new file mode 100644 index 0000000..2951d54 --- /dev/null +++ b/mimetype.h @@ -0,0 +1,33 @@ +/** + * @PROJECT CGI Bash Shell Interface + * @COPYRIGHT See COPYING in the top level directory + * @FILE mimetype.h + * @PURPOSE Mimetype and file upload handler + * @DEVELOPERS Nathan Angelacos + * Rafal Kupiec + */ + +#ifndef __MIMETYPE_H +#define __MIMETYPE_H + +typedef struct { + char* name; + char* filename; + char* type; + char* tempname; + buffer_t value; + int fh; +} mime_var_t; + +void empty_stdin(void); +void mime_exec(mime_var_t* obj, char* fifo); +char* mime_substr(char* start, int len); +void mime_tag_add(mime_var_t* obj, char* str); +void mime_var_destroy(mime_var_t* obj); +void mime_var_init(mime_var_t* obj); +void mime_var_open_target(mime_var_t* obj); +void mime_var_putenv(list_t* env, mime_var_t* obj); +void mime_var_writer(mime_var_t* obj, char* str, int len); +int rfc2388_handler(list_t* env); + +#endif diff --git a/subshell.c b/subshell.c new file mode 100644 index 0000000..02f79f4 --- /dev/null +++ b/subshell.c @@ -0,0 +1,373 @@ +/** + * @PROJECT CGI Bash Shell Interface + * @COPYRIGHT See COPYING in the top level directory + * @FILE subshell.c + * @PURPOSE Subshell execution + * @DEVELOPERS Nathan Angelacos + * Rafal Kupiec + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "common.h" +#include "buffer.h" +#include "error.h" +#include "subshell.h" +#include "cbsi.h" + +char open_tag[3] = "<%"; +char close_tag[3] = "%>"; + +const char* g_tag[] = { + "", + "", + ":", + "@", + "" +}; + +token_t* build_token_list(script_t* scriptbuf, token_t* tokenlist) { + char* start; + char* end; + char* curpos; + char* endpos; + token_t* curtoken; + token_t* firsttoken; + + curtoken = tokenlist; + firsttoken = tokenlist; + curpos = scriptbuf->buf + scriptbuf->curpos; + endpos = scriptbuf->buf + scriptbuf->size; + while(curpos < endpos) { + start = strstr(curpos, open_tag); + end = strstr(curpos, close_tag); + if(start && !end) { + die_with_message(scriptbuf, start, g_err_msg[E_NO_END_MARKER], open_tag[1]); + } + if((start > end) || (!start && end)) { + die_with_message(scriptbuf, end, g_err_msg[E_END_BEFORE_BEGIN], open_tag[1], open_tag[1]); + } + if(start && (strstr(start + 1, open_tag) && (strstr (start + 1, open_tag) < end))) + die_with_message(scriptbuf, start, g_err_msg[E_NO_END_MARKER], open_tag[1]); + if(end) { + curtoken = push_token_on_list(curtoken, scriptbuf, curpos, start - curpos); + if(firsttoken == NULL) { + firsttoken = curtoken; + } + curtoken = push_token_on_list(curtoken, scriptbuf, start, end - start); + if(firsttoken == NULL) { + firsttoken = curtoken; + } + curpos = end + 2; + } else { + curtoken = push_token_on_list(curtoken, scriptbuf, curpos, endpos - curpos); + if(firsttoken == NULL) { + firsttoken = curtoken; + } + curpos = endpos; + } + } + return firsttoken; +} + +void free_script_list(script_t* script) { + script_t* next; + + while(script) { + next = script->next; + if(script->name) { + free(script->name); + } + if(script->buf) { + free(script->buf); + } + free(script); + script = next; + } +} + +void free_token_list(token_t* tokenlist) { + token_t* next; + + while(tokenlist) { + next = tokenlist->next; + free(tokenlist); + tokenlist = next; + } +} + +script_t* load_script(char* filename, script_t* scriptlist) { + script_t* scriptbuf; + int scriptfp; + struct stat filestat; + + scriptfp = open(filename, O_NONBLOCK + O_RDONLY); + if(scriptfp == -1) { + die_with_message(NULL, NULL, g_err_msg[E_FILE_OPEN_FAIL], filename); + } + fstat(scriptfp, &filestat); + scriptbuf = (script_t *) xmalloc(sizeof (script_t)); + scriptbuf->name = (char *) xmalloc(strlen (filename) + 1); + scriptbuf->buf = (char *) xmalloc(filestat.st_size + 1); + memset(scriptbuf->name, 0, strlen(filename) + 1); + memcpy(scriptbuf->name, filename, strlen(filename)); + memset(scriptbuf->buf, 0, filestat.st_size + 1); + read(scriptfp, scriptbuf->buf, filestat.st_size); + scriptbuf->size = filestat.st_size; + scriptbuf->uid = filestat.st_uid; + scriptbuf->gid = filestat.st_gid; + scriptbuf->curpos = 0; + scriptbuf->next = NULL; + if(scriptlist != NULL) { + while(scriptlist->next) { + scriptlist = scriptlist->next; + } + scriptlist->next = scriptbuf; + } + if(memcmp(scriptbuf->buf, "#!", 2) == 0) { + while((scriptbuf->curpos < scriptbuf->size) && ((char) scriptbuf->buf[scriptbuf->curpos] != '\n')) { + (scriptbuf->curpos)++; + } + (scriptbuf->curpos)++; + } + close(scriptfp); + return scriptbuf; +} + +void preprocess_token_list(token_t* tokenlist) { + script_t* newscript; + token_t* me; + char* cp; + + me = tokenlist; + while(me) { + if(memcmp(me->buf, open_tag, 2)) { + me->tag = HTML; + } else { + me->tag = NOOP; + me->buf[me->len] = '\0'; + cp = me->buf + 2; + if(memcmp(cp, g_tag[ECHO], 1) == 0) { + me->tag = ECHO; + me->buf = find_whitespace(me->buf); + me->len = strlen(me->buf); + } else if(memcmp(cp, g_tag[TRANSLATE], 1) == 0) { + me->tag = TRANSLATE; + me->buf = find_whitespace(me->buf); + me->len = strlen(me->buf); + } + if(isspace(*cp)) { + me->tag = RUN; + me->buf = cp; + } + if(me->tag == NOOP) { + die_with_message(me->script, cp, g_err_msg[E_NO_OP]); + } + me->len = strlen(me->buf); + } + me = me->next; + } +} + +token_t* process_token_list(buffer_t* buf, token_t* token) { + char *c; + + buffer_init(buf); + subshell_exec(buf, "\n"); + while(token) { + switch(token->tag) { + case HTML: + c = token->buf; + while((c < (token->buf + token->len)) && (isspace(*c))) { + c++; + } + if(c != token->buf + token->len) { + subshell_echo (buf, token->buf, token->len); + } + break; + case RUN: + subshell_exec(buf, token->buf); + subshell_exec(buf, "\n"); + break; + case ECHO: + subshell_eval(buf, token->buf, token->len); + break; + case TRANSLATE: + subshell_translate(buf, token->buf, token->len); + break; + default: + break; + } + token = token->next; + } + return token; +} + +token_t* push_token_on_list(token_t* tokenlist, script_t* scriptbuf, char* start, size_t len) { + token_t* me; + token_t* next; + + if(len == 0) { + return tokenlist; + } + me = (token_t*) xmalloc(sizeof(token_t)); + if(tokenlist == NULL) { + next = NULL; + } else { + next = tokenlist->next; + tokenlist->next = me; + } + me->next = next; + me->script = scriptbuf; + me->buf = start; + me->len = len; + return me; +} + +void subshell_destroy(void) { + int status; + waitpid(subshell_pid, &status, 0); +} + +void subshell_doscript(buffer_t* script, char* name) { + static char postfix[] = "\nexit\n"; + + write(subshell_pipe[PARENT_OUT], script->data, script->ptr - script->data); + write(subshell_pipe[PARENT_OUT], postfix, strlen(postfix)); + return; +} + +void subshell_echo(buffer_t* buf, char* str, size_t len) { + static char echo_start[] = "printf '%s' '"; + static char echo_quote[] = "'\\''"; + static char echo_end[] = "'\n"; + const size_t maxlen = 3096; + size_t pos; + + if(len == 0) { + return; + } + pos = 0; + buffer_add(buf, echo_start, strlen(echo_start)); + while(pos < len) { + if (str[pos] == '\'') { + buffer_add(buf, echo_quote, strlen(echo_quote)); + } else { + buffer_add(buf, str + pos, 1); + } + pos++; + if((pos % maxlen) == 0) { + buffer_add(buf, echo_end, strlen(echo_end)); + buffer_add(buf, echo_start, strlen(echo_start)); + } + } + buffer_add(buf, echo_end, strlen(echo_end)); +} + +void subshell_eval(buffer_t* buf, char* str, size_t len) { + static char echo_start[] = "echo -n "; + static char echo_end[] = "\n"; + + if(len == 0) { + return; + } + str = trim(str); + if(!*str) { + return; + } + buffer_add(buf, echo_start, strlen(echo_start)); + buffer_add(buf, str, len); + buffer_add(buf, echo_end, strlen(echo_end)); +} + +void subshell_exec(buffer_t* buf, char* str) { + buffer_add (buf, str, strlen (str)); + return; +} + +void subshell_setup (char* shell, list_t* env) { + int retcode = 0; + int count; + argv_t* argv; + char* av[20]; + list_t* next; + + if(shell == NULL) { + return; + } + retcode = pipe(&subshell_pipe[PARENT_IN]); + if(retcode == 0) { + subshell_pid = fork(); + if(subshell_pid == -1) { + die_with_message(NULL, NULL, g_err_msg[E_SUBSHELL_FAIL]); + } + if(subshell_pid == 0) { + dup2(subshell_pipe[PARENT_IN], STDIN_FILENO); + close(subshell_pipe[PARENT_IN]); + close(subshell_pipe[PARENT_OUT]); + count = argc_argv(shell, &argv); + if(count > 19) { + av[19] = "\0"; + count = 18; + } + while(count >= 0) { + av[count] = argv[count].string; + count--; + } + while(env) { + next = env->next; + putenv(env->buf); + env = next; + } + execv(argv[0].string, av); + free(argv); + die_with_message(NULL, NULL, g_err_msg[E_SUBSHELL_FAIL]); + } else { + close(subshell_pipe[PARENT_IN]); + } + } +} + +void subshell_translate(buffer_t* buf, char* str, size_t len) { + static char echo_start[] = "echo -n \""; + static char echo_end[] = "\"\n"; + short hash; + lstr* i; + char* text = NULL; + + if(len == 0) { + return; + } + str = trim(str); + if(!*str) { + return; + } + if(language != NULL && translations > 0) { + hash = generateHash(str); + i = ltable[hash]; + while(text == NULL && i != NULL) { + if(strcmp(str, i->msgid) == 0) { + text = i->msgstr; + } else { + i = i->next; + } + } + } + if(text == NULL) { + text = str; + } + buffer_add(buf, echo_start, strlen(echo_start)); + buffer_add(buf, text, strlen(text)); + buffer_add(buf, echo_end, strlen(echo_end)); +} diff --git a/subshell.h b/subshell.h new file mode 100644 index 0000000..ee6847b --- /dev/null +++ b/subshell.h @@ -0,0 +1,52 @@ +/** + * @PROJECT CGI Bash Shell Interface + * @COPYRIGHT See COPYING in the top level directory + * @FILE subshell.h + * @PURPOSE Subshell execution + * @DEVELOPERS Nathan Angelacos + * Rafal Kupiec + */ + +#ifndef __SUBSHELL_H +#define __SUBSHELL_H + +static int subshell_pid; +static int subshell_pipe[2]; + +enum pipe_t { PARENT_IN, PARENT_OUT }; +enum tag_t { HTML, RUN, ECHO, TRANSLATE, NOOP }; + +typedef struct { + char* name; + int size; + uid_t uid; + gid_t gid; + char* buf; + size_t curpos; + void* next; +} script_t; + +typedef struct { + script_t* script; + enum tag_t tag; + size_t len; + char* buf; + void* next; +} token_t; + +token_t* build_token_list(script_t* scriptbuf, token_t* tokenlist); +void free_script_list(script_t* script); +void free_token_list(token_t* tokenlist); +script_t* load_script(char* filename, script_t* scriptlist); +void preprocess_token_list(token_t* tokenlist); +token_t* process_token_list(buffer_t* buf, token_t* tokenlist); +token_t* push_token_on_list(token_t* tokenlist, script_t* scriptbuf, char* start, size_t len); +void subshell_destroy(void); +void subshell_doscript(buffer_t* script, char* name); +void subshell_echo(buffer_t* buf, char* str, size_t len); +void subshell_eval(buffer_t* buf, char* str, size_t len); +void subshell_exec(buffer_t* buf, char* str); +void subshell_setup(char* shell, list_t* env); +void subshell_translate(buffer_t* buf, char* str, size_t len); + +#endif