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Merge pull request #2046 from 0intro/dpkginfo-no-apt
Rewrite dpkginfo probe without using APT
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,179 @@ | ||
| #ifdef HAVE_CONFIG_H | ||
| #include <config.h> | ||
| #endif | ||
|
|
||
| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include <string.h> | ||
| #include <ctype.h> | ||
| #include <limits.h> | ||
|
|
||
| #include "debug_priv.h" | ||
| #include "dpkginfo-helper.h" | ||
|
|
||
| #define DPKG_STATUS_BUFFER_SIZE 4096 | ||
|
|
||
| static char* trimleft(char *str) | ||
| { | ||
| while (isspace((unsigned char)*str)) | ||
| str++; | ||
|
|
||
| if (*str == 0) | ||
| return str; | ||
|
|
||
| return str; | ||
| } | ||
|
|
||
| static int version(struct dpkginfo_reply_t *reply) | ||
| { | ||
| char *evr, *epoch, *version, *release; | ||
|
|
||
| if (reply->evr == NULL) | ||
| return -1; | ||
|
|
||
| evr = strdup(reply->evr); | ||
| if (evr == NULL) | ||
| return -1; | ||
|
|
||
| if ((epoch = strchr(evr, ':')) != NULL) { | ||
| *epoch++ = '\0'; | ||
| reply->epoch = strdup(evr); | ||
| if (reply->epoch == NULL) | ||
| goto err; | ||
| } else { | ||
| reply->epoch = strdup("0"); | ||
| if (reply->epoch == NULL) | ||
| goto err; | ||
| epoch = evr; | ||
| } | ||
|
|
||
| version = epoch; | ||
| if ((release = strchr(version, '-')) != NULL) { | ||
| *release++ = '\0'; | ||
| reply->release = strdup(release); | ||
| if (reply->release == NULL) | ||
| goto err; | ||
| } | ||
| reply->version = strdup(version); | ||
| if (reply->version == NULL) | ||
| goto err; | ||
|
|
||
| free(evr); | ||
| return 0; | ||
| err: | ||
| free(evr); | ||
| return -1; | ||
| } | ||
|
|
||
| struct dpkginfo_reply_t* dpkginfo_get_by_name(const char *name, int *err) | ||
| { | ||
| FILE *f; | ||
| char buf[DPKG_STATUS_BUFFER_SIZE], path[PATH_MAX], *root, *key, *value; | ||
| struct dpkginfo_reply_t *reply; | ||
|
|
||
| *err = 0; | ||
| reply = NULL; | ||
|
|
||
| root = getenv("OSCAP_PROBE_ROOT"); | ||
| if (root != NULL) | ||
| snprintf(path, PATH_MAX, "%s/var/lib/dpkg/status", root); | ||
| else | ||
| snprintf(path, PATH_MAX, "/var/lib/dpkg/status"); | ||
|
|
||
| f = fopen(path, "r"); | ||
| if (f == NULL) { | ||
| dW("%s not found.", path); | ||
| *err = -1; | ||
| return NULL; | ||
| } | ||
|
|
||
| dD("Searching package \"%s\".", name); | ||
|
|
||
| while (fgets(buf, DPKG_STATUS_BUFFER_SIZE, f)) { | ||
| if (buf[0] == '\n') { | ||
| // New package entry. | ||
| if (reply != NULL) { | ||
| // Package found. | ||
| goto out; | ||
| } | ||
| continue; | ||
| } | ||
| if (isspace(buf[0])) { | ||
| // Ignore line beginning by a space. | ||
| continue; | ||
| } | ||
| buf[strcspn(buf, "\n")] = 0; | ||
| key = buf; | ||
| value = strchr(buf, ':'); | ||
| if (value == NULL) { | ||
| // Ignore truncated line. | ||
| continue; | ||
| } | ||
| *value++ = '\0'; | ||
| value = trimleft(value); | ||
| // Package should be the first line. | ||
| if (strcmp(key, "Package") == 0) { | ||
| if (strcmp(value, name) == 0) { | ||
| if (reply != NULL) | ||
| continue; | ||
| reply = calloc(1, sizeof(*reply)); | ||
| if (reply == NULL) | ||
| goto err; | ||
| reply->name = strdup(value); | ||
| if (reply->name == NULL) | ||
| goto err; | ||
| } | ||
| } else if (reply != NULL) { | ||
| if (strcmp(key, "Status") == 0) { | ||
| if (strcmp(value, "install") != 0) { | ||
| // Package deinstalled. | ||
| dD("Package \"%s\" has been deinstalled.", name); | ||
| dpkginfo_free_reply(reply); | ||
| reply = NULL; | ||
| continue; | ||
| } | ||
| } else if (strcmp(key, "Architecture") == 0) { | ||
| reply->arch = strdup(value); | ||
| if (reply->arch == NULL) | ||
| goto err; | ||
| } else if (strcmp(key, "Version") == 0) { | ||
| reply->evr = strdup(value); | ||
| if (reply->evr == NULL) | ||
| goto err; | ||
| if (version(reply) < 0) | ||
| goto err; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // Reached end of file. | ||
|
|
||
| out: | ||
| if (reply != NULL) { | ||
| // Package found. | ||
| dD("Package \"%s\" found (arch=%s evr=%s epoch=%s version=%s release=%s).", | ||
| name, reply->arch, reply->evr, reply->epoch, reply->version, reply->release); | ||
| *err = 1; | ||
| } | ||
| fclose(f); | ||
| return reply; | ||
| err: | ||
| dW("Insufficient memory available to allocate duplicate string."); | ||
| fclose(f); | ||
| dpkginfo_free_reply(reply); | ||
| *err = -1; | ||
| return NULL; | ||
| } | ||
|
|
||
| void dpkginfo_free_reply(struct dpkginfo_reply_t *reply) | ||
| { | ||
| if (reply) { | ||
| free(reply->name); | ||
| free(reply->arch); | ||
| free(reply->epoch); | ||
| free(reply->release); | ||
| free(reply->version); | ||
| free(reply->evr); | ||
| free(reply); | ||
| } | ||
| } |
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