/* * * Conky, a system monitor, based on torsmo * * Any original torsmo code is licensed under the BSD license * * All code written since the fork of torsmo is licensed under the GPL * * Please see COPYING for details * * Copyright (c) 2004, Hannu Saransaari and Lauri Hakkarainen * Copyright (c) 2005-2019 Brenden Matthews, Philip Kovacs, et. al. * (see AUTHORS) * All rights reserved. * * 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 3 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, see . * */ #include #include #include #include #include #include #include "common.h" #include "config.h" #include "conky.h" #include "logging.h" #include "text_object.h" #define MAX_HEADTAIL_LINES 30 #define DEFAULT_MAX_HEADTAIL_USES 2 struct headtail { int wantedlines{0}; std::string logfile; char *buffer{nullptr}; int current_use{0}; int max_uses{0}; int reported{0}; headtail() = default; ~headtail() { free(buffer); } }; static void tailstring(char *string, int endofstring, int wantedlines) { int i, linescounted = 0; string[endofstring] = 0; if (endofstring > 0) { if (string[endofstring - 1] == '\n') { // work with or without \n at end of file string[endofstring - 1] = 0; } for (i = endofstring - 1; i >= 0 && linescounted < wantedlines; i--) { if (string[i] == '\n') { linescounted++; } } if (i > 0) { strfold(string, i + 2); } } } void free_tailhead(struct text_object *obj) { auto *ht = static_cast(obj->data.opaque); obj->data.opaque = nullptr; delete ht; } void init_tailhead(const char *type, const char *arg, struct text_object *obj, void *free_at_crash) { unsigned int args; auto *ht = new headtail; std::unique_ptr tmp(new char[DEFAULT_TEXT_BUFFER_SIZE]); memset(tmp.get(), 0, DEFAULT_TEXT_BUFFER_SIZE); ht->max_uses = DEFAULT_MAX_HEADTAIL_USES; // XXX: Buffer overflow ? args = sscanf(arg, "%s %d %d", tmp.get(), &ht->wantedlines, &ht->max_uses); if (args < 2 || args > 3) { free_tailhead(obj); CRIT_ERR(obj, free_at_crash, "%s needs a file as 1st and a number of lines as 2nd argument", type); } if (ht->max_uses < 1) { free_tailhead(obj); CRIT_ERR(obj, free_at_crash, "invalid arg for %s, next_check must be larger than 0", type); } if (ht->wantedlines > 0 && ht->wantedlines <= MAX_HEADTAIL_LINES) { ht->logfile = to_real_path(tmp.get()); ht->buffer = nullptr; ht->current_use = 0; } else { free_tailhead(obj); CRIT_ERR(obj, free_at_crash, "invalid arg for %s, number of lines must be between 1 and %d", type, MAX_HEADTAIL_LINES); } obj->data.opaque = ht; } static void print_tailhead(const char *type, struct text_object *obj, char *p, unsigned int p_max_size) { int fd, i, endofstring = 0, linescounted = 0; FILE *fp; struct stat st {}; auto *ht = static_cast(obj->data.opaque); if (ht == nullptr) { return; } // empty the buffer and reset the counter if we used it the max number of // times if ((ht->buffer != nullptr) && ht->current_use >= ht->max_uses - 1) { free_and_zero(ht->buffer); ht->current_use = 0; } // use the buffer if possible if (ht->buffer != nullptr) { strcpy(p, ht->buffer); ht->current_use++; } else { // otherwise find the needed data if (stat(ht->logfile.c_str(), &st) == 0) { if (S_ISFIFO(st.st_mode)) { fd = open_fifo(ht->logfile.c_str(), &ht->reported); if (fd != -1) { if (strcmp(type, "head") == 0) { for (i = 0; linescounted < ht->wantedlines; i++) { if (read(fd, p + i, 1) <= 0) { break; } if (p[i] == '\n') { linescounted++; } } p[i] = 0; } else if (strcmp(type, "tail") == 0) { i = read(fd, p, p_max_size - 1); tailstring(p, i, ht->wantedlines); } else { CRIT_ERR(nullptr, nullptr, "If you are seeing this then there is a bug in the code, " "report it !"); } } close(fd); } else { fp = open_file(ht->logfile.c_str(), &ht->reported); if (fp != nullptr) { if (strcmp(type, "head") == 0) { for (i = 0; i < ht->wantedlines; i++) { if (fgets(p + endofstring, p_max_size - endofstring, fp) == nullptr) { break; } endofstring = strlen(p); } } else if (strcmp(type, "tail") == 0) { fseek(fp, -static_cast(p_max_size), SEEK_END); i = fread(p, 1, p_max_size - 1, fp); tailstring(p, i, ht->wantedlines); } else { CRIT_ERR(nullptr, nullptr, "If you are seeing this then there is a bug in the code, " "report it !"); } fclose(fp); } } ht->buffer = strdup(p); } else { CRIT_ERR(nullptr, nullptr, "$%s can't find information about %s", type, ht->logfile.c_str()); } } } void print_head(struct text_object *obj, char *p, unsigned int p_max_size) { print_tailhead("head", obj, p, p_max_size); } void print_tail(struct text_object *obj, char *p, unsigned int p_max_size) { print_tailhead("tail", obj, p, p_max_size); } /* FIXME: use something more general (see also tail.c, head.c */ #define BUFSZ 0x1000 void print_lines(struct text_object *obj, char *p, unsigned int p_max_size) { static int rep = 0; FILE *fp = open_file(obj->data.s, &rep); char buf[BUFSZ]; int j, lines; if (fp == nullptr) { snprintf(p, p_max_size, "%s", "File Unreadable"); return; } lines = 0; while (fgets(buf, BUFSZ, fp) != nullptr) { for (j = 0; buf[j] != 0; j++) { if (buf[j] == '\n') { lines++; } } } snprintf(p, p_max_size, "%d", lines); fclose(fp); } void print_words(struct text_object *obj, char *p, unsigned int p_max_size) { static int rep = 0; FILE *fp = open_file(obj->data.s, &rep); char buf[BUFSZ]; int j, words; char inword = 0; if (fp == nullptr) { snprintf(p, p_max_size, "%s", "File Unreadable"); return; } words = 0; while (fgets(buf, BUFSZ, fp) != nullptr) { for (j = 0; buf[j] != 0; j++) { if (isspace(static_cast(buf[j])) == 0) { if (inword == 0) { words++; inword = 1; } } else { inword = 0; } } } snprintf(p, p_max_size, "%d", words); fclose(fp); }