diff options
Diffstat (limited to 'syslog.c')
| -rw-r--r-- | syslog.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/syslog.c b/syslog.c new file mode 100644 index 0000000..024428a --- /dev/null +++ b/syslog.c @@ -0,0 +1,184 @@ +/* SPDX-License-Identifier: ISC */ +#include <getopt.h> +#include <syslog.h> +#include <string.h> +#include <stdlib.h> +#include <stdio.h> +#include <ctype.h> + +#include "syslogd.h" + +static int facility = 1; +static int level = LOG_INFO; +static int flags = LOG_NDELAY | LOG_NOWAIT; +static const char *ident = "(shell)"; + +static const struct option options[] = { + { "help", no_argument, NULL, 'h' }, + { "version", no_argument, NULL, 'V' }, + { "console", required_argument, NULL, 'c' }, + { "facility", required_argument, NULL, 'f' }, + { "level", required_argument, NULL, 'l' }, + { "ident", required_argument, NULL, 'i' }, + { NULL, 0, NULL, 0 }, +}; + +static const char *shortopt = "hVcf:l:i:"; + +static const char *helptext = +"Usage: syslog [OPTION]... [STRING]...\n\n" +"Concatenate the given STRINGs and send a log message to the syslog daemon.\n" +"\n" +"The following OPTIONSs can be used:\n" +" -f, --facility <facility> Logging facilty name or numeric identifier.\n" +" -l, --level <level> Log level name or numeric identifier.\n" +" -i, --ident <name> Program name for log syslog message.\n" +" Default is \"%s\".\n\n" +" -c, --console Write to the console if opening the syslog\n" +" socket fails.\n\n" +" -h, --help Print this help text and exit\n" +" -V, --version Print version information and exit\n\n"; + +static const char *version_string = +"syslog (usyslog) " PACKAGE_VERSION "\n" +"Copyright (C) 2018 David Oberhollenzer\n\n" +"This is free software: you are free to change and redistribute it.\n" +"There is NO WARRANTY, to the extent permitted by law.\n"; + +static void usage(int status) +{ + const char *str; + int i; + + if (status != EXIT_SUCCESS) { + fputs("Try `syslog --help' for more information\n", stderr); + } else { + printf(helptext, ident); + + fputs("The following values can be used for --level:\n", + stdout); + + i = 0; + while ((str = level_id_to_string(i)) != NULL) { + printf(" %s (=%d)%s\n", str, i, + i == level ? ", set as default" : ""); + ++i; + } + + fputs("\nThe following values can be used for --facility:\n", + stdout); + + i = 0; + while ((str = facility_id_to_string(i)) != NULL) { + printf(" %s (=%d)%s\n", str, i, + i == facility ? ", set as default" : ""); + ++i; + } + } + + exit(status); +} + +static int readint(const char *str) +{ + int x = 0; + + if (!isdigit(*str)) + return -1; + + while (isdigit(*str)) + x = x * 10 + (*(str++)) - '0'; + + return (*str == '\0') ? x : -1; +} + +static void process_options(int argc, char **argv) +{ + int c; + + for (;;) { + c = getopt_long(argc, argv, shortopt, options, NULL); + if (c == -1) + break; + + switch (c) { + case 'f': + facility = readint(optarg); + if (facility >= 0) + break; + facility = facility_id_from_string(optarg); + if (facility < 0) { + fprintf(stderr, "Unknown facility name '%s'\n", + optarg); + usage(EXIT_FAILURE); + } + break; + case 'l': + level = readint(optarg); + if (level >= 0) + break; + level = level_id_from_string(optarg); + if (level < 0) { + fprintf(stderr, "Unknown log level '%s'\n", + optarg); + usage(EXIT_FAILURE); + } + break; + case 'i': + ident = optarg; + break; + case 'c': + flags |= LOG_CONS; + break; + case 'V': + fputs(version_string, stdout); + exit(EXIT_SUCCESS); + break; + case 'h': + usage(EXIT_SUCCESS); + break; + default: + usage(EXIT_FAILURE); + break; + } + } +} + + +int main(int argc, char **argv) +{ + size_t len = 0; + char *str; + int i; + + process_options(argc, argv); + + if (optind >= argc) { + fputs("Error: no log string provided.\n", stderr); + usage(EXIT_FAILURE); + } + + for (i = optind; i < argc; ++i) + len += strlen(argv[i]); + + len += argc - optind - 1; + + str = calloc(1, len + 1); + if (str == NULL) { + fputs("syslog: out of memory\n", stderr); + return EXIT_FAILURE; + } + + for (i = optind; i < argc; ++i) { + if (i > optind) + strcat(str, " "); + strcat(str, argv[i]); + } + + openlog(ident, flags, facility << 3); + syslog(level, "%s", str); + closelog(); + + free(str); + return EXIT_SUCCESS; +} |