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457 lines
11 KiB
457 lines
11 KiB
/* filter.c: filter framework functions
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*
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* Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
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*
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* Licensed under GNU General Public License v2
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* (see COPYING for full license text)
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*/
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#include "cgit.h"
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#include "html.h"
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#ifndef NO_LUA
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#include <dlfcn.h>
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#include <lua.h>
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#include <lualib.h>
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#include <lauxlib.h>
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#endif
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static inline void reap_filter(struct cgit_filter *filter)
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{
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if (filter && filter->cleanup)
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filter->cleanup(filter);
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}
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void cgit_cleanup_filters(void)
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{
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int i;
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reap_filter(ctx.cfg.about_filter);
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reap_filter(ctx.cfg.commit_filter);
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reap_filter(ctx.cfg.source_filter);
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reap_filter(ctx.cfg.email_filter);
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reap_filter(ctx.cfg.owner_filter);
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reap_filter(ctx.cfg.auth_filter);
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for (i = 0; i < cgit_repolist.count; ++i) {
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reap_filter(cgit_repolist.repos[i].about_filter);
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reap_filter(cgit_repolist.repos[i].commit_filter);
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reap_filter(cgit_repolist.repos[i].source_filter);
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reap_filter(cgit_repolist.repos[i].email_filter);
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reap_filter(cgit_repolist.repos[i].owner_filter);
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}
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}
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static int open_exec_filter(struct cgit_filter *base, va_list ap)
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{
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struct cgit_exec_filter *filter = (struct cgit_exec_filter *)base;
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int pipe_fh[2];
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int i;
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for (i = 0; i < filter->base.argument_count; i++)
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filter->argv[i + 1] = va_arg(ap, char *);
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filter->old_stdout = chk_positive(dup(STDOUT_FILENO),
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"Unable to duplicate STDOUT");
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chk_zero(pipe(pipe_fh), "Unable to create pipe to subprocess");
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filter->pid = chk_non_negative(fork(), "Unable to create subprocess");
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if (filter->pid == 0) {
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close(pipe_fh[1]);
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chk_non_negative(dup2(pipe_fh[0], STDIN_FILENO),
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"Unable to use pipe as STDIN");
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execvp(filter->cmd, filter->argv);
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die_errno("Unable to exec subprocess %s", filter->cmd);
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}
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close(pipe_fh[0]);
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chk_non_negative(dup2(pipe_fh[1], STDOUT_FILENO),
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"Unable to use pipe as STDOUT");
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close(pipe_fh[1]);
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return 0;
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}
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static int close_exec_filter(struct cgit_filter *base)
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{
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struct cgit_exec_filter *filter = (struct cgit_exec_filter *)base;
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int i, exit_status = 0;
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chk_non_negative(dup2(filter->old_stdout, STDOUT_FILENO),
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"Unable to restore STDOUT");
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close(filter->old_stdout);
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if (filter->pid < 0)
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goto done;
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waitpid(filter->pid, &exit_status, 0);
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if (WIFEXITED(exit_status))
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goto done;
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die("Subprocess %s exited abnormally", filter->cmd);
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done:
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for (i = 0; i < filter->base.argument_count; i++)
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filter->argv[i + 1] = NULL;
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return WEXITSTATUS(exit_status);
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}
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static void fprintf_exec_filter(struct cgit_filter *base, FILE *f, const char *prefix)
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{
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struct cgit_exec_filter *filter = (struct cgit_exec_filter *)base;
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fprintf(f, "%sexec:%s\n", prefix, filter->cmd);
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}
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static void cleanup_exec_filter(struct cgit_filter *base)
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{
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struct cgit_exec_filter *filter = (struct cgit_exec_filter *)base;
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if (filter->argv) {
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free(filter->argv);
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filter->argv = NULL;
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}
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if (filter->cmd) {
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free(filter->cmd);
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filter->cmd = NULL;
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}
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}
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static struct cgit_filter *new_exec_filter(const char *cmd, int argument_count)
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{
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struct cgit_exec_filter *f;
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int args_size = 0;
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f = xmalloc(sizeof(*f));
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/* We leave argv for now and assign it below. */
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cgit_exec_filter_init(f, xstrdup(cmd), NULL);
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f->base.argument_count = argument_count;
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args_size = (2 + argument_count) * sizeof(char *);
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f->argv = xmalloc(args_size);
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memset(f->argv, 0, args_size);
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f->argv[0] = f->cmd;
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return &f->base;
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}
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void cgit_exec_filter_init(struct cgit_exec_filter *filter, char *cmd, char **argv)
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{
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memset(filter, 0, sizeof(*filter));
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filter->base.open = open_exec_filter;
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filter->base.close = close_exec_filter;
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filter->base.fprintf = fprintf_exec_filter;
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filter->base.cleanup = cleanup_exec_filter;
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filter->cmd = cmd;
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filter->argv = argv;
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/* The argument count for open_filter is zero by default, unless called from new_filter, above. */
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filter->base.argument_count = 0;
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}
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#ifdef NO_LUA
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void cgit_init_filters(void)
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{
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}
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#endif
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#ifndef NO_LUA
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static ssize_t (*libc_write)(int fd, const void *buf, size_t count);
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static ssize_t (*filter_write)(struct cgit_filter *base, const void *buf, size_t count) = NULL;
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static struct cgit_filter *current_write_filter = NULL;
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void cgit_init_filters(void)
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{
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libc_write = dlsym(RTLD_NEXT, "write");
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if (!libc_write)
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die("Could not locate libc's write function");
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}
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ssize_t write(int fd, const void *buf, size_t count)
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{
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if (fd != STDOUT_FILENO || !filter_write)
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return libc_write(fd, buf, count);
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return filter_write(current_write_filter, buf, count);
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}
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static inline void hook_write(struct cgit_filter *filter, ssize_t (*new_write)(struct cgit_filter *base, const void *buf, size_t count))
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{
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/* We want to avoid buggy nested patterns. */
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assert(filter_write == NULL);
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assert(current_write_filter == NULL);
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current_write_filter = filter;
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filter_write = new_write;
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}
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static inline void unhook_write(void)
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{
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assert(filter_write != NULL);
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assert(current_write_filter != NULL);
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filter_write = NULL;
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current_write_filter = NULL;
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}
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struct lua_filter {
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struct cgit_filter base;
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char *script_file;
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lua_State *lua_state;
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};
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static void error_lua_filter(struct lua_filter *filter)
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{
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die("Lua error in %s: %s", filter->script_file, lua_tostring(filter->lua_state, -1));
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lua_pop(filter->lua_state, 1);
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}
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static ssize_t write_lua_filter(struct cgit_filter *base, const void *buf, size_t count)
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{
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struct lua_filter *filter = (struct lua_filter *)base;
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lua_getglobal(filter->lua_state, "filter_write");
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lua_pushlstring(filter->lua_state, buf, count);
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if (lua_pcall(filter->lua_state, 1, 0, 0)) {
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error_lua_filter(filter);
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errno = EIO;
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return -1;
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}
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return count;
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}
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static inline int hook_lua_filter(lua_State *lua_state, void (*fn)(const char *txt))
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{
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const char *str;
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ssize_t (*save_filter_write)(struct cgit_filter *base, const void *buf, size_t count);
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struct cgit_filter *save_filter;
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str = lua_tostring(lua_state, 1);
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if (!str)
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return 0;
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save_filter_write = filter_write;
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save_filter = current_write_filter;
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unhook_write();
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fn(str);
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hook_write(save_filter, save_filter_write);
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return 0;
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}
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static int html_lua_filter(lua_State *lua_state)
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{
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return hook_lua_filter(lua_state, html);
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}
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static int html_txt_lua_filter(lua_State *lua_state)
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{
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return hook_lua_filter(lua_state, html_txt);
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}
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static int html_attr_lua_filter(lua_State *lua_state)
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{
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return hook_lua_filter(lua_state, html_attr);
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}
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static int html_url_path_lua_filter(lua_State *lua_state)
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{
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return hook_lua_filter(lua_state, html_url_path);
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}
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static int html_url_arg_lua_filter(lua_State *lua_state)
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{
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return hook_lua_filter(lua_state, html_url_arg);
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}
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static int html_include_lua_filter(lua_State *lua_state)
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{
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return hook_lua_filter(lua_state, (void (*)(const char *))html_include);
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}
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static void cleanup_lua_filter(struct cgit_filter *base)
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{
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struct lua_filter *filter = (struct lua_filter *)base;
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if (!filter->lua_state)
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return;
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lua_close(filter->lua_state);
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filter->lua_state = NULL;
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if (filter->script_file) {
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free(filter->script_file);
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filter->script_file = NULL;
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}
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}
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static int init_lua_filter(struct lua_filter *filter)
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{
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if (filter->lua_state)
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return 0;
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if (!(filter->lua_state = luaL_newstate()))
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return 1;
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luaL_openlibs(filter->lua_state);
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lua_pushcfunction(filter->lua_state, html_lua_filter);
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lua_setglobal(filter->lua_state, "html");
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lua_pushcfunction(filter->lua_state, html_txt_lua_filter);
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lua_setglobal(filter->lua_state, "html_txt");
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lua_pushcfunction(filter->lua_state, html_attr_lua_filter);
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lua_setglobal(filter->lua_state, "html_attr");
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lua_pushcfunction(filter->lua_state, html_url_path_lua_filter);
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lua_setglobal(filter->lua_state, "html_url_path");
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lua_pushcfunction(filter->lua_state, html_url_arg_lua_filter);
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lua_setglobal(filter->lua_state, "html_url_arg");
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lua_pushcfunction(filter->lua_state, html_include_lua_filter);
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lua_setglobal(filter->lua_state, "html_include");
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if (luaL_dofile(filter->lua_state, filter->script_file)) {
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error_lua_filter(filter);
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lua_close(filter->lua_state);
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filter->lua_state = NULL;
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return 1;
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}
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return 0;
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}
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static int open_lua_filter(struct cgit_filter *base, va_list ap)
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{
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struct lua_filter *filter = (struct lua_filter *)base;
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int i;
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if (init_lua_filter(filter))
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return 1;
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hook_write(base, write_lua_filter);
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lua_getglobal(filter->lua_state, "filter_open");
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for (i = 0; i < filter->base.argument_count; ++i)
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lua_pushstring(filter->lua_state, va_arg(ap, char *));
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if (lua_pcall(filter->lua_state, filter->base.argument_count, 0, 0)) {
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error_lua_filter(filter);
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return 1;
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}
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return 0;
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}
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static int close_lua_filter(struct cgit_filter *base)
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{
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struct lua_filter *filter = (struct lua_filter *)base;
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int ret = 0;
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lua_getglobal(filter->lua_state, "filter_close");
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if (lua_pcall(filter->lua_state, 0, 1, 0)) {
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error_lua_filter(filter);
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ret = -1;
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} else {
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ret = lua_tonumber(filter->lua_state, -1);
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lua_pop(filter->lua_state, 1);
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}
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unhook_write();
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return ret;
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}
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static void fprintf_lua_filter(struct cgit_filter *base, FILE *f, const char *prefix)
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{
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struct lua_filter *filter = (struct lua_filter *)base;
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fprintf(f, "%slua:%s\n", prefix, filter->script_file);
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}
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static struct cgit_filter *new_lua_filter(const char *cmd, int argument_count)
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{
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struct lua_filter *filter;
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filter = xmalloc(sizeof(*filter));
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memset(filter, 0, sizeof(*filter));
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filter->base.open = open_lua_filter;
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filter->base.close = close_lua_filter;
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filter->base.fprintf = fprintf_lua_filter;
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filter->base.cleanup = cleanup_lua_filter;
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filter->base.argument_count = argument_count;
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filter->script_file = xstrdup(cmd);
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return &filter->base;
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}
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#endif
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int cgit_open_filter(struct cgit_filter *filter, ...)
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{
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int result;
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va_list ap;
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if (!filter)
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return 0;
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va_start(ap, filter);
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result = filter->open(filter, ap);
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va_end(ap);
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return result;
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}
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int cgit_close_filter(struct cgit_filter *filter)
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{
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if (!filter)
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return 0;
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return filter->close(filter);
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}
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void cgit_fprintf_filter(struct cgit_filter *filter, FILE *f, const char *prefix)
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{
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filter->fprintf(filter, f, prefix);
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}
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static const struct {
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const char *prefix;
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struct cgit_filter *(*ctor)(const char *cmd, int argument_count);
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} filter_specs[] = {
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{ "exec", new_exec_filter },
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#ifndef NO_LUA
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{ "lua", new_lua_filter },
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#endif
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};
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struct cgit_filter *cgit_new_filter(const char *cmd, filter_type filtertype)
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{
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char *colon;
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int i;
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size_t len;
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int argument_count;
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if (!cmd || !cmd[0])
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return NULL;
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colon = strchr(cmd, ':');
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len = colon - cmd;
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/*
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* In case we're running on Windows, don't allow a single letter before
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* the colon.
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*/
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if (len == 1)
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colon = NULL;
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switch (filtertype) {
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case AUTH:
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argument_count = 12;
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break;
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case EMAIL:
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argument_count = 2;
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break;
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case OWNER:
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argument_count = 0;
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break;
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case SOURCE:
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case ABOUT:
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argument_count = 1;
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break;
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case COMMIT:
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default:
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argument_count = 0;
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break;
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}
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/* If no prefix is given, exec filter is the default. */
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if (!colon)
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return new_exec_filter(cmd, argument_count);
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for (i = 0; i < ARRAY_SIZE(filter_specs); i++) {
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if (len == strlen(filter_specs[i].prefix) &&
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!strncmp(filter_specs[i].prefix, cmd, len))
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return filter_specs[i].ctor(colon + 1, argument_count);
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}
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die("Invalid filter type: %.*s", (int) len, cmd);
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}
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