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Diffstat (limited to 'src/pslog.c')
| -rw-r--r-- | src/pslog.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/src/pslog.c b/src/pslog.c new file mode 100644 index 0000000..6da6f9b --- /dev/null +++ b/src/pslog.c @@ -0,0 +1,175 @@ +/* + * pslog.c - print process log paths. + * + * Copyright (C) 2015-2017 Vito Mule' + * Copyright (C) 2024 Craig Small <csmall@dropbear.xyz> + * + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef _GNU_SOURCE +#define _GNU_SOURCE +#endif + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <dirent.h> +#include <errno.h> +#include <limits.h> +#include <regex.h> +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <sys/types.h> +#include <unistd.h> +#include <stdio.h> + +#include "i18n.h" + + +#ifndef PATH_MAX +#define PATH_MAX 4096 +#endif /* PATH_MAX */ + +static int +usage () +{ + fprintf(stderr, + "Usage: pslog PID...\n" + " pslog -V, --version\n\n" + + " -V,--version display version information\n\n"); + exit(255); +} + +void +print_version() +{ + fprintf(stderr, "pslog (PSmisc) %s\n", VERSION); + fprintf(stderr, + "Copyright (C) 2015-2017 Vito Mule'.\n\n"); + fprintf(stderr, + "PSmisc comes with ABSOLUTELY NO WARRANTY.\n" + "This is free software, and you are welcome to redistribute it under\n" + "the terms of the GNU General Public License.\n" + "For more information about these matters, see the files named COPYING.\n"); +} + +int +main(int argc, char const *argv[]) +{ + regex_t re_log; + regex_t re_pid; + char *fullpath = NULL; + + if (argc < 2) { + usage(); + } + + /* + * Allowed on the command line: + * --version + * -V + * /proc/nnnn + * nnnn + * where nnnn is any number that doesn't begin with 0. + * If --version or -V are present, further arguments are ignored + * completely. + */ + + regcomp(&re_pid, "^((/proc/+)?[1-9][0-9]*|-V|--version)$", + REG_EXTENDED|REG_NOSUB); + + if (regexec(&re_pid, argv[1], 0, NULL, 0) != 0) { + fprintf(stderr, "pslog: invalid process id: %s\n\n", argv[1]); + usage(); + } + else if (!strcmp("-V", argv[1]) || !strcmp("--version", argv[1])) { + print_version(); + return 0; + } + + regfree(&re_pid); + regcomp(&re_log, "^(.*log)$",REG_EXTENDED|REG_NOSUB); + + /* + * At this point, all arguments are in the form /proc/nnnn + * or nnnn, so a simple check based on the first char is + * possible. + */ + + struct dirent *namelist; + + char* linkpath = (char*) malloc(PATH_MAX+1); + if (!linkpath) { + perror ("malloc"); + return 1; + } + + ssize_t linkname_size; + char buf[PATH_MAX+1]; + DIR *pid_dir; + + if (argv[1][0] != '/') { + if (asprintf(&fullpath, "/proc/%s/fd/", argv[1]) < 0) { + perror ("asprintf"); + free(linkpath); + return 1; + } + } else { + if (asprintf(&fullpath, "%s/fd/", argv[1]) < 0) { + perror("asprintf"); + free(linkpath); + return 1; + } + } + + pid_dir = opendir(fullpath); + if (!pid_dir) { + perror("opendir"); + free(linkpath); + free(fullpath); + return 1; + } + + fprintf(stdout, "Pid no %s:\n", argv[1]); + + while((namelist = readdir(pid_dir))) { + strncpy(linkpath, fullpath, PATH_MAX); + strncat(linkpath, namelist->d_name, PATH_MAX - strlen(linkpath)); + linkname_size = readlink(linkpath, buf, PATH_MAX -1); + buf[linkname_size+1] = '\0'; + + if (regexec(&re_log, buf, 0, NULL, 0) == 0) { + fprintf(stdout, "Log path: %s\n", buf); + } + memset(&linkpath[0], 0, sizeof(*linkpath)); + memset(&buf[0], 0, sizeof(buf)); + } + + free(linkpath); + free(fullpath); + regfree(&re_log); + + if (closedir(pid_dir)) { + perror ("closedir"); + return 1; + } + + return 0; +} |